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usb: gadget: align buffer size when allocating for OUT endpoint

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Using usb_ep_align() makes sure that the buffer size for OUT endpoints is
always aligned with wMaxPacketSize (512 usually). This makes sure
that no buffer has the wrong size, which can cause nasty bugs.

Signed-off-by: Felipe F. Tonello <eu@felipetonello.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Felipe F. Tonello
2016-08-08 21:30:06 +01:00
committed by Felipe Balbi
parent 69bb99738b
commit e0466156ee
2 changed files with 18 additions and 1 deletions
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3
drivers/usb/gadget/u_f.c
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@@ -12,6 +12,7 @@
*/
#include "u_f.h"
#include <linux/usb/ch9.h>
struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len, int default_len)
{
@@ -20,6 +21,8 @@ struct usb_request *alloc_ep_req(struct usb_ep *ep, size_t len, int default_len)
req = usb_ep_alloc_request(ep, GFP_ATOMIC);
if (req) {
req->length = len ?: default_len;
if (usb_endpoint_dir_out(ep->desc))
req->length = usb_ep_align(ep, req->length);
req->buf = kmalloc(req->length, GFP_ATOMIC);
if (!req->buf) {
usb_ep_free_request(ep, req);