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authorRobert Lukassen <Robert.Lukassen@tomtom.com>2011-03-16 14:13:34 +0300
committerGreg Kroah-Hartman <gregkh@suse.de>2011-03-23 23:21:02 +0300
commit878b753e32ca765cd346a5d3038d630178ec78ff (patch)
tree0b72c2d333471c292d7b30ef675302f1205022df /drivers/usb/class
parent97ac01d8f1b8d1c9e5af32c2813ba771835961f9 (diff)
downloadlinux-878b753e32ca765cd346a5d3038d630178ec78ff.tar.xz
USB: Fix 'bad dma' problem on WDM device disconnect
In the WDM class driver a disconnect event leads to calls to usb_free_coherent to put back two USB DMA buffers allocated earlier. The call to usb_free_coherent uses a different size parameter (desc->wMaxCommand) than the corresponding call to usb_alloc_coherent (desc->bMaxPacketSize0). When a disconnect event occurs, this leads to 'bad dma' complaints from usb core because the USB DMA buffer is being pushed back to the 'buffer-2048' pool from which it has not been allocated. This patch against the most recent linux-2.6 kernel ensures that the parameters used by usb_alloc_coherent & usb_free_coherent calls in cdc-wdm.c match. Signed-off-by: Robert Lukassen <robert.lukassen@tomtom.com> Cc: stable <stable@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/class')
-rw-r--r--drivers/usb/class/cdc-wdm.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 47085e5879ab..a97c018dd419 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -281,7 +281,7 @@ static void cleanup(struct wdm_device *desc)
desc->sbuf,
desc->validity->transfer_dma);
usb_free_coherent(interface_to_usbdev(desc->intf),
- desc->wMaxCommand,
+ desc->bMaxPacketSize0,
desc->inbuf,
desc->response->transfer_dma);
kfree(desc->orq);