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Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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When a device changes its configuration ROM, it announces this with a
bus reset. firewire-core has to check which node initiated a bus reset
and whether any unit directories went away or were added on this node.
Tested with an IOI FWB-IDE01AB which has its link-on bit set if bus
power is available but does not respond to ROM read requests if self
power is off. This implements
- recognition of the units if self power is switched on after fw-core
gave up the initial attempt to read the config ROM,
- shutdown of the units when self power is switched off.
Also tested with a second PC running Linux/ieee1394. When the eth1394
driver is inserted and removed on that node, fw-core now notices the
addition and removal of the IPv4 unit on the ieee1394 node.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Add wrappers for getting and putting a unit.
Remove some line breaks.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Jarod Wilson <jwilson@redhat.com>
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"modprobe firewire-ohci; sleep .1; modprobe -r firewire-ohci" used to
result in crashes like this:
BUG: unable to handle kernel paging request at ffffffff8807b455
IP: [<ffffffff8807b455>]
PGD 203067 PUD 207063 PMD 7c170067 PTE 0
Oops: 0010 [1] PREEMPT SMP
CPU 0
Modules linked in: i915 drm cpufreq_ondemand acpi_cpufreq freq_table applesmc input_polldev led_class coretemp hwmon eeprom snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss button thermal processor sg snd_hda_intel snd_pcm snd_timer snd snd_page_alloc sky2 i2c_i801 rtc [last unloaded: crc_itu_t]
Pid: 9, comm: events/0 Not tainted 2.6.25-rc2 #3
RIP: 0010:[<ffffffff8807b455>] [<ffffffff8807b455>]
RSP: 0018:ffff81007dcdde88 EFLAGS: 00010246
RAX: ffff81007dc95040 RBX: ffff81007dee5390 RCX: 0000000000005e13
RDX: 0000000000008c8b RSI: 0000000000000001 RDI: ffff81007dee5388
RBP: ffff81007dc5eb40 R08: 0000000000000002 R09: ffffffff8022d05c
R10: ffffffff8023b34c R11: ffffffff8041a353 R12: ffff81007dee5388
R13: ffffffff8807b455 R14: ffffffff80593bc0 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffffffff8055a000(0000) knlGS:0000000000000000
CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
CR2: ffffffff8807b455 CR3: 0000000000201000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process events/0 (pid: 9, threadinfo ffff81007dcdc000, task ffff81007dc95040)
Stack: ffffffff8023b396 ffffffff88082524 0000000000000000 ffffffff8807d9ae
ffff81007dc5eb40 ffff81007dc9dce0 ffff81007dc5eb40 ffff81007dc5eb80
ffff81007dc9dce0 ffffffffffffffff ffffffff8023be87 0000000000000000
Call Trace:
[<ffffffff8023b396>] ? run_workqueue+0xdf/0x1df
[<ffffffff8023be87>] ? worker_thread+0xd8/0xe3
[<ffffffff8023e917>] ? autoremove_wake_function+0x0/0x2e
[<ffffffff8023bdaf>] ? worker_thread+0x0/0xe3
[<ffffffff8023e813>] ? kthread+0x47/0x74
[<ffffffff804198e0>] ? trace_hardirqs_on_thunk+0x35/0x3a
[<ffffffff8020c008>] ? child_rip+0xa/0x12
[<ffffffff8020b6e3>] ? restore_args+0x0/0x3d
[<ffffffff8023e68a>] ? kthreadd+0x14c/0x171
[<ffffffff8023e68a>] ? kthreadd+0x14c/0x171
[<ffffffff8023e7cc>] ? kthread+0x0/0x74
[<ffffffff8020bffe>] ? child_rip+0x0/0x12
Code: Bad RIP value.
RIP [<ffffffff8807b455>]
RSP <ffff81007dcdde88>
CR2: ffffffff8807b455
---[ end trace c7366c6657fe5bed ]---
Note that this crash happened _after_ firewire-core was unloaded. The
shared workqueue tried to run firewire-core's device initialization jobs
or similar jobs.
The fix makes sure that firewire-ohci and hence firewire-core is not
unloaded before all device shutdown jobs have been completed. This is
determined by the count of device initializations minus device releases.
Also skip useless retries in the node initialization job if the node is
to be shut down.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Jarod Wilson <jwilson@redhat.com>
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There is a race between shutdown and creation of devices: fw-core may
attempt to add a device with the same name of an already existing
device. http://bugzilla.kernel.org/show_bug.cgi?id=9828
Impact of the bug: Happens rarely (when shutdown of a device coincides
with creation of another), forces the user to unplug and replug the new
device to get it working.
The fix is obvious: Free the minor number *after* instead of *before*
device_unregister(). This requires to take an additional reference of
the fw_device as long as the IDR tree points to it.
And while we are at it, we fix an additional race condition:
fw_device_op_open() took its reference of the fw_device a little bit too
late, hence was in danger to access an already invalid fw_device.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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up on config rom"
fw_device.node_id and fw_device.generation are accessed without mutexes.
We have to ensure that all readers will get to see node_id updates
before generation updates.
Fixes an inability to recognize devices after "giving up on config rom",
https://bugzilla.redhat.com/show_bug.cgi?id=429950
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Reviewed by Nick Piggin <nickpiggin@yahoo.com.au>.
Verified to fix 'giving up on config rom' issues on multiple system and
drive combinations that were previously affected.
Signed-off-by: Jarod Wilson <jwilson@redhat.com>
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
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Fixes "New firewire stack only recognizing half of a chain of drives",
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=242254
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Use a speed probe to determine the speed over 1394b buses and of nodes
which report a link speed less than their PHY speed.
Log the effective maximum speed of newly created nodes in dmesg.
Also, read the config ROM (except bus info block) at the maximum speed
rather than S100. This isn't a real optimization though because we
still only use quadlet read requests for the entire ROM.
The patch also adds support for S1600 and S3200, although such hardware
does not exist yet.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
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The attribute /sys/bus/scsi/devices/*:*:*:*/ieee1394_id, as generated by
the old sbp2 driver, is typically used to create persistently named
links in /dev/disk/by-id.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
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Drop filenames from file preamble, drop editor annotations and
use standard indent style for block comments.
Signed-off-by: Kristian Hoegsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> (fixed typo)
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We dynamically create an attribute group for the key present on the
device in hand and point device->group to it. This way the device
core adds the sysfs attributes for us as the device is added.
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Puts a stray endian annotation down.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Drop the event list semaphore and only use the wait queue and the list
to synchronize queue access. Break out of a poll or read whenever
the device is disconnected.
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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devices.
The old mechanism kept a struct cdev for each fw device, but fops->release
would reference this struct after the device got freed in some cases.
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
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Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Kristian Høgsberg <krh@redhat.com>
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Instances of struct file_operations and struct fw_card_driver can be
qualified as "const". Ditto with struct fw_descriptor.data, struct
fw_device_id, and predefined instances of struct fw_address_region,
at least in the current implementation.
Data qualified as const is placed into the .rodata section which won't
be mixed with dirty data.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Replace __fw_core_h by __fw_transaction_h to match the file name.
Add comments to the final #endif in header files.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
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