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authorBorislav Petkov <bbpetkov@yahoo.de>2007-10-28 13:24:16 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2007-11-28 13:58:34 -0800
commitbfaeafcfc2242277e31cc1cfae687afaac0cd9ec (patch)
tree15b6a182df4e0d2d15a26a9c10124b7ec18e82a3 /drivers/usb
parented206ec9ab398e1c3756ff0eb9507db1d009e65f (diff)
usbserial: fix inconsistent lock state
In commit acd2a847e7fee7df11817f67dba75a2802793e5d usb_serial_generic_write() disables interrupts when taking &port->lock which is also taken in usb_serial_generic_read_bulk_callback() resulting in an inconsistent lock state due to the latter not disabling interrupts on the local cpu. Fix that by disabling interrupts in the latter call site also. Signed-off-by: Borislav Petkov <bbpetkov@yahoo.de> Acked-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/serial/generic.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index 9eb4a65ee4d..d41531139c5 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -327,6 +327,7 @@ void usb_serial_generic_read_bulk_callback (struct urb *urb)
struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
unsigned char *data = urb->transfer_buffer;
int status = urb->status;
+ unsigned long flags;
dbg("%s - port %d", __FUNCTION__, port->number);
@@ -339,11 +340,11 @@ void usb_serial_generic_read_bulk_callback (struct urb *urb)
usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
/* Throttle the device if requested by tty */
- spin_lock(&port->lock);
+ spin_lock_irqsave(&port->lock, flags);
if (!(port->throttled = port->throttle_req))
/* Handle data and continue reading from device */
flush_and_resubmit_read_urb(port);
- spin_unlock(&port->lock);
+ spin_unlock_irqrestore(&port->lock, flags);
}
EXPORT_SYMBOL_GPL(usb_serial_generic_read_bulk_callback);