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Correct the xHCI code to handle stalls on USB endpoints. We need to move
the endpoint ring's dequeue pointer past the stalled transfer, or the HW
will try to restart the transfer the next time the doorbell is rung.
Don't attempt to clear a halt on an endpoint if we haven't seen a stalled
transfer for it. The USB core will attempt to clear a halt on all
endpoints when it selects a new configuration.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Adds support for controllers that use 64-byte contexts. The following context
data structures are affected by this: Device, Input, Input Control, Endpoint,
and Slot. To accommodate the use of either 32 or 64-byte contexts, a Device or
Input context can only be accessed through functions which look-up and return
pointers to their contained contexts.
Signed-off-by: John Youn <johnyoun@synopsys.com>
Acked-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Make sure the xHCI output device context is 64-byte aligned. Previous
code was using the same structure for both the output device context and
the input control context. Since the structure had 32 bytes of flags
before the device context, the output device context wouldn't be 64-byte
aligned. Define a new structure to use for the output device context and
clean up the debugging for these two structures.
The copy of the device context in the input control context does *not*
need to be 64-byte aligned.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Allocates and initializes the scratchpad buffer array (XHCI 4.20). This is an
array of 64-bit DMA addresses to scratch pages that the controller may use
during operation. The number of pages is specified in the "Max Scratchpad
Buffers" field of HCSPARAMS2. The DMA address of this array is written into
slot 0 of the DCBAA.
Signed-off-by: John Youn <johnyoun@synopsys.com>
Acked-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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usb_parse_ss_endpoint_companion() was supposed to allocate a structure to
hold the SuperSpeed Endpoint Companion descriptor, and either copy the
values the device returned, or fill in default values if the device
descriptor did not include the companion descriptor.
However, the previous code would miss the last endpoint in a configuration
with no descriptors after it. Make usb_parse_endpoint() allocate the SS
endpoint companion descriptor and fill it with default values, even if
we've run out of buffer space in this configuration descriptor.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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This is a work around for a bug in the SuperSpeed Endpoint Companion Descriptor
parsing code. It fails in some corner cases, which means ep->ss_ep_comp may be
NULL.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Pass back a babble error when this error code is seen in the transfer event TRB.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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The xHCI host controller can be programmed to retry a transfer a certain number
of times per endpoint before it passes back an error condition to the host
controller driver. The xHC will return an error code when the error count
transitions from 1 to 0. Programming an error count of 3 means the xHC tries
the transfer 3 times, programming it with a 1 means it tries to transfer once,
and programming it with 0 means the HW tries the transfer infinitely.
We want isochronous transfers to only be tried once, so set the error count to
one.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Add more debugging to the irq handler, slot context initialization, ring
operations, URB cancellation, and MMIO writes.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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The Event Handler Busy bit in the event ring dequeue pointer is write 1 to
clear. Fix the interrupt service routine to clear that bit after the
event handler has run.
xhci_set_hc_event_deq() is designed to update the event ring dequeue pointer
without changing any of the four reserved bits in the lower nibble. The event
handler busy (EHB) bit is write one to clear, so the new value must always
contain a zero in that bit in order to preserve the EHB value.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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When there is a short packet on a control transfer, the xHCI host controller
hardware will generate two events. The first event will be for the data stage
TD with a completion code for a short packet. The second event will be for the
status stage with a successful completion code. Before this patch, the xHCI
driver would giveback the short control URB when it received the event for the
data stage TD. Then it would become confused when it saw a status stage event
for the endpoint for an URB it had already finished processing.
Change the xHCI host controller driver to wait for the status stage event when
it receives a short transfer completion code for a data stage TD.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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There are several xHCI data structures that use two 32-bit fields to
represent a 64-bit address. Since some architectures don't support 64-bit
PCI writes, the fields need to be written in two 32-bit writes. The xHCI
specification says that if a platform is incapable of generating 64-bit
writes, software must write the low 32-bits first, then the high 32-bits.
Hardware that supports 64-bit addressing will wait for the high 32-bit
write before reading the revised value, and hardware that only supports
32-bit writes will ignore the high 32-bit write.
Previous xHCI code represented 64-bit addresses with two u32 values. This
lead to buggy code that would write the 32-bits in the wrong order, or
forget to write the upper 32-bits. Change the two u32s to one u64 and
create a function call to write all 64-bit addresses in the proper order.
This new function could be modified in the future if all platforms support
64-bit writes.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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The xHCI functions to queue an URB onto the hardware rings must be called
with the xhci spinlock held. Those functions will allocate memory, and
take a gfp_t memory flags argument. We must pass them the GFP_ATOMIC
flag, since we don't want the memory allocation to attempt to sleep while
waiting for more memory to become available.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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When an endpoint on a device under an xHCI host controller stalls, the
host controller driver must let the hardware know that the USB core has
successfully cleared the halt condition. The HCD submits a Reset Endpoint
Command, which will clear the toggle bit for USB 2.0 devices, and set the
sequence number to zero for USB 3.0 devices.
The xHCI urb_enqueue will accept new URBs while the endpoint is halted,
and will queue them to the hardware rings. However, the endpoint doorbell
will not be rung until the Reset Endpoint Command completes.
Don't queue a reset endpoint command for root hubs. khubd clears halt
conditions on the roothub during the initialization process, but the roothub
isn't a real device, so the xHCI host controller doesn't need to know about the
cleared halt.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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The 0.95 xHCI specification requires software to set the "TD size" field
in each transaction request block (TRB). This field gives the host
controller an indication of how much data is remaining in the TD
(including the buffer in the current TRB). Set this field in bulk TRBs
and data stage TRBs for control transfers.
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Without this change the loops won't start
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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THis patch (as1270) allows the usbtest module to be built even when
USB_DEVICEFS isn't configured. Tests can be performed without
USB_DEVICEFS, using the /dev/bus/usb/*/* device files.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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INDEX register has to be set to '0' before reading
CONFIGDATA register which is only present in TI musb
platforms.
Currently the default register access mode is set to
FLAT_MODE thus INDEX register is not getting set
properly with musb_ep_select() which is just a nop
operation in FLAT_MODE.This invalid register read is
causing module reinset failure.
Fixing the issue by moving INDEX register write part to
musb_read_configdata() function itself.
Signed-off-by: Vikram Pandita <vikram.pandita@ti.com>
Signed-off-by: Anand Gadiyar <gadiyar@ti.com>
Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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musb_otg_timer_func() is defined under #ifdef CONFIG_USB_MUSB_OTG.
Make sure any reference to it is also under the same #ifdef.
Without this fix, the driver failes to compile when USB_OTG is defined
but USB_MUSB_OTG isn't.
Signed-off-by: Amit Kucheria <amit.kucheria@canonical.com>
Cc: Felipe Balbi <felipe.balbi@nokia.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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This function uses wrong bit mask to prevent clearing RXCSR status
bits when halting an endpoint -- which results in clearing SentStall
and RxPktRdy bits (that the code actually tries to avoid); must be
a result of cut-and-paste...
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Added support for the Alcatel X060S/X200 broadband modems to the option
driver. The device starts in cd-rom emulation mode (1bbb:f000) and
requires the use of the usb_modeswitch tool to switch it to modem mode
(1bbb:0000).
Signed-off-by: Javier Martin <jmartinj@iname.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Signed-off-by: Peng Huang <shawn.p.huang@gmail.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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I've opened up the case, and the chips in the ATEN UC2324 are:
Moschip
MCS7840CV-AA
69507-6B1
0650
(USB to 4-port serial)
(logo with AF kerned together) 0748
24BC02
SINGLP
(unknown 8-pin chip)
(logo looks like 3 or Z in circle)
ZT3243LEEA 0752
B7A16420.T
(4 chips, so this will be RS232 line driver)
(Probably equivalent of Sipex SP3243)
So the ATEN 2324 (aten2011.c driver), is definitely the Moschip 7840,
and should use the mos7840.c driver. I expect you will remove the
aten2011.c driver from the staging area.
From the aten2011.c source code, the device ID for the UC2322 (2 port
serial) is 0x7820, just like the Moschip evaluation board. This value
should be added to the device id table of mos7840.c.
Here's a patch that adds these devices to the driver.
From: Russell Lang <gsview@ghostgum.com.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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BugLink: https://bugs.launchpad.net/bugs/365291
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Current listed Onda ids are ZTE devices. Replace them with ZTE id define
and add more ZTE device ids. Also remove 19d2:2000, this is the id when
device is first plugged in and is a CD-only device, before the switch
using eject.
These changes are based on a previous patch by Ming Zhao
<zhao.ming9@zte.com.cn>
Signed-off-by: Herton Ronaldo Krzesinski <herton@mandriva.com.br>
Cc: Ming Zhao <zhao.ming9@zte.com.cn>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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I noticed that USB initialization didn't setup correctly on my kirkwood
based board (OpenRD base) if I hadn't initialized USB in U-boot first.
The error message looks like this:
ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
orion-ehci orion-ehci.0: Marvell Orion EHCI
orion-ehci orion-ehci.0: new USB bus registered, assigned bus number 1
orion-ehci orion-ehci.0: can't setup
orion-ehci orion-ehci.0: USB bus 1 deregistered
orion-ehci orion-ehci.0: init orion-ehci.0 fail, -110
orion-ehci: probe of orion-ehci.0 failed with error -110
which is caused by ehci_halt() timing out in the handshake() call. I
noticed that U-boot does a reset before calling handshake(), so this
patch does the same thing for Linux. USB now works for me.
Signed-off-by: Simon Kagstrom <simon.kagstrom@netinsight.net>
Acked-by: Nicolas Pitre <nico@marvell.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Signed-off-by: Craig Shelley <craig@microtron.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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The patch adds support for the GN Otometrics Aurical USB Audiometer
(FT232BM-based).
A new VID and a new PID is added.
Signed-off-by: Ville Sundberg <vsundber@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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OMAP: OHCI: hc_driver's stop method should call ohci_stop
Without this, the ohci-omap driver will not cleanup the debugfs
nodes when the driver is unloaded. So the next insmod will fail,
if CONFIG_DEBUG_FS and CONFIG_USB_DEBUG are both selected.
Reported-by: vikram pandita <vikram.pandita@ti.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Anand Gadiyar <gadiyar@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Requests to get max LUN, for certain USB storage devices, require a
longer timeout before a correct reply is returned. This happens for a
Realtek USB Card Reader (0bda:0152), which has a max LUN of 3 but is set
to 0, thus losing functionality, because of the timeout occurring too
quickly.
Raising the timeout value fixes the issue and might help other devices
to return a correct max LUN value as well.
Signed-off-by: Giacomo Lozito <james@develia.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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This is needed for compilation without CONFIG_PM.
Signed-off-by: Oliver Neukum <oliver@neukum.org>
Acked-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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After commit f092c240494f2d807401d93f95f683909b90af96 ("USB: option:
remove unnecessary and erroneous code") the variable 'serial' becomes
unused, as gcc-4.3.2 points out:
drivers/usb/serial/option.c: In function 'option_instat_callback':
drivers/usb/serial/option.c:834: warning: unused variable 'serial'
drivers/usb/serial/option.c: In function 'option_open':
drivers/usb/serial/option.c:930: warning: unused variable 'serial'
So I removed it.
Signed-off-by: Carlos R. Mafra <crmafra@aei.mpg.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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This fixes
- locking bug that was hidden by ecc2e05e739c30870c8e4f252b63a0c4041f2724
- Regression #13821
- Spurious warning when closing and blocking for data write out
With these changes my PL2303 always ends up as ttyUSB0 when it should and
the module refcounts stay correct.
I'll do a more wholesale split & tidy of _open in the next release or two
as we get a standard tty_port_open and port->ops->init port->ops->shutdown
call backs.
Copy sent to Alan Stern and Carlos Mafra just to confirm it fixes all the
reports but it passes local testing with the same hardware as Alan Stern.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The port lock is used to protect the port state. However the port structure
is freed on a hangup, then the lock taken on a close. The right fix is to
drop the port on tty->shutdown() but we can't yet do that due to sleep v
non-sleeping rules. Instead do the next best thing and fix it up when we are
not in -rc season.
Reported-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Tested-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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This function does not have an error return and returning an error is
instead interpreted as having a lot of pending bytes.
Reported by Jeff Harris who provided a list of some of the remaining
offenders.
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6: (48 commits)
USB: otg: fix module reinsert issue
USB: handle zero-length usbfs submissions correctly
USB: EHCI: report actual_length for iso transfers
USB: option: remove unnecessary and erroneous code
USB: cypress_m8: remove invalid Clear-Halt
USB: musb_host: undo incorrect change in musb_advance_schedule()
USB: fix LANGID=0 regression
USB: serial: sierra driver id_table additions
USB serial: Add ID for Turtelizer, an FT2232L-based JTAG/RS-232 adapter.
USB: fix race leading to a write after kfree in usbfs
USB: Sierra: fix oops upon device close
USB: option.c: add A-Link 3GU device id
USB: Serial: Add support for Arkham Technology adapters
USB: Fix option_ms regression in 2.6.31-rc2
USB: gadget audio: select SND_PCM
USB: ftdi: support NDI devices
Revert USB: usbfs: deprecate and hide option for !embedded
USB: usb.h: fix kernel-doc notation
USB: RNDIS gadget, fix issues talking from PXA
USB: serial: FTDI with product code FB80 and vendor id 0403
...
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Platform_device instance (pd) is not set to NULL in
usb_nop_xceiv_unregister() causing usb_nop_xceiv_register()
to fail during module reinsert.
From: Ajay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: Babu Ravi <ravibabu@ti.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
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This patch (as1262) fixes a bug in usbfs: It refuses to accept
zero-length transfers, and it insists that the buffer pointer be valid
even if there is no data being transferred.
The patch also consolidates a bunch of repetitive access_ok() checks
into a single check, which incidentally fixes the lack of such a check
for Isochronous URBs.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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This patch (as1259b) makes ehci-hcd return the total number of bytes
transferred in urb->actual_length for Isochronous transfers.
Until now, the actual_length value was unaccountably left at 0.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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This patch (as1264) removes a bunch of unnecessary and erroneous stuff
from the option USB-serial driver. Clearly there's no need to verify
that the device pointer stored in the URBs is right or to store the
same pointer over again. After all, the pointer can't change once it
has been set up.
There's also no need to call usb_clear_halt for the IN endpoint
multiple times -- in fact, doing so is an error since every time after
the first there will be active URBs queued for that endpoint. Since
the Clear-Halts don't appear to be needed at all, the patch simply
removes them.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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This patch (as1265) removes an erroneous call to usb_clear_halt from
the cypress_m8 driver. The call isn't valid because it is made from
interrupt context whereas usb_clear_halt is a blocking routine.
Presumably the code has never been executed; if it did it would cause
an oops. So instead treat -EPIPE like any other sort of unexplained
error.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Commit c9cd06b3d6ea825c62e277def929cc4315802b48 (musb_host: refactor
URB giveback) included due to my overlook the change incorrect in the
context of the current kernel -- undo it.
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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commit b7af0bb ("USB: allow malformed LANGID descriptors") broke support
for devices without string descriptor support.
Reporting string descriptors is optional to USB devices, and a device
lets us know it can't deal with strings by responding to the LANGID
request with a STALL token.
The kernel handled that correctly before b7af0bb came in, but failed
hard if the LANGID was reported but broken. More than that, if a device
was not able to provide string descriptors, the LANGID was retrieved
over and over again at each string read request.
This patch changes the behaviour so that
a) the LANGID is only queried once
b) devices which can't handle string requests are not asked again
c) devices with malformed LANGID values have a sane fallback to 0x0409
Signed-off-by: Daniel Mack <daniel@caiaq.de>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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- Updated the id_table with all devices that Sierra Wireless currently
support
- Re-ordered the contents of the id_table for better readability
Signed-off-by: Elina Pasheva <epasheva@sierrawireless.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Adds USB ID for Turtelizer, an FT2232L-based JTAG/RS-232 adapter.
Signed-off-by: Krzysztof Ha³asa <khc@pm.waw.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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this fixes a race between async_completed() and proc_reapurbnonblock().
CPU A CPU B
spin_lock(&ps->lock);
list_move_tail(&as->asynclist, &ps->async_completed);
spin_unlock(&ps->lock);
if (!(as = async_getcompleted(ps)))
return -EAGAIN;
return processcompl(as, (void __user * __user *)arg);
processcompl() calls free_async() which calls kfree(as)
as->status = urb->status;
if (as->signr) {
sinfo.si_signo = as->signr;
sinfo.si_errno = as->status;
sinfo.si_code = SI_ASYNCIO;
sinfo.si_addr = as->userurb;
kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid,
as->euid, as->secid);
}
snoop(&urb->dev->dev, "urb complete\n");
snoop_urb(urb, as->userurb);
write after kfree
Signed-off-by: Oliver Neukum <oliver@neukum.org>
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This patch (as1263) fixes a mixup that occurred when conflicting
patches for the sierra driver were merged incorrectly. The former
sierra_shutdown routine should have been become sierra_release, not
sierra_disconnect.
The symptom this fixes is an oops when the device file is closed after
a Sierra device has been unplugged (Bugzilla #13675).
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Peter Naulls <peter@mushroomnetworks.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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Add A-Link 3GU device id 1e0e:9200 into option driver. The device
has 4 interfaces, of which 1 is handled by storage and the other 3
by option driver.
The device appears first as CD-only 1e0e:f000 device and must be
switched to 1e0e:9200 mode either by using "eject CD" or
usb_modeswitch.
For the record, the device does not work with generic usbserial
driver (usb disconnect when sending the ATDT command).
Signed-off-by: Anssi Hannula <anssi.hannula@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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