diff options
| author | Borislav Petkov <bbpetkov@yahoo.de> | 2007-10-28 13:24:16 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-11-28 22:58:34 +0100 |
| commit | bfaeafcfc2242277e31cc1cfae687afaac0cd9ec (patch) | |
| tree | 15b6a182df4e0d2d15a26a9c10124b7ec18e82a3 | |
| parent | USB: fix usbled disconnect read race #2 (diff) | |
| download | linux-bfaeafcfc2242277e31cc1cfae687afaac0cd9ec.tar.xz linux-bfaeafcfc2242277e31cc1cfae687afaac0cd9ec.zip | |
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>
| -rw-r--r-- | drivers/usb/serial/generic.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c index 9eb4a65ee4d9..d41531139c55 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); |