V4L/DVB (8829): gspca: Have a clean kmalloc-ated buffer for USB exchanges.

The USB buffer may be used for DMA and there may be a caching problem
if the buffer is part of the device structure.
Thanks to Alan Stern.

Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/media/video/gspca/gspca.h b/drivers/media/video/gspca/gspca.h
index 7c2f44b2397f..c17625cff9ba 100644
--- a/drivers/media/video/gspca/gspca.h
+++ b/drivers/media/video/gspca/gspca.h
@@ -127,7 +127,8 @@ struct gspca_dev {
         const struct sd_desc *sd_desc;          /* subdriver description */
         unsigned ctrl_dis;              /* disabled controls (bit map) */
 
-        __u8 usb_buf[8];                        /* buffer for USB exchanges */
+#define USB_BUF_SZ 64
+        __u8 *usb_buf;                          /* buffer for USB exchanges */
         struct urb *urb[MAX_NURBS];
 
         __u8 *frbuf;                            /* buffer for nframes */