linux-kernel - [PATCH] usb: gadget: amd5536udc: unconditionally use GFP_ATOMIC in udc

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Date:	Thu,  1 Aug 2013 23:50:47 +0400
From:	Alexey Khoroshilov <khoroshilov@...ras.ru>
To:	Thomas Dahlmann <dahlmann.thomas@...or.de>,
	Felipe Balbi <balbi@...com>
Cc:	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	linux-geode@...ts.infradead.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: [PATCH] usb: gadget: amd5536udc: unconditionally use GFP_ATOMIC in udc_queue()

As far as prep_dma() is called with spinlock held,
we have to pass GFP_ATOMIC regardless of gfp argument.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@...ras.ru>
---
 drivers/usb/gadget/amd5536udc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/amd5536udc.c b/drivers/usb/gadget/amd5536udc.c
index f52dcfe..a9a4346 100644
--- a/drivers/usb/gadget/amd5536udc.c
+++ b/drivers/usb/gadget/amd5536udc.c
@@ -1122,7 +1122,7 @@ udc_queue(struct usb_ep *usbep, struct usb_request *usbreq, gfp_t gfp)
 			goto finished;
 		}
 		if (ep->dma) {
-			retval = prep_dma(ep, req, gfp);
+			retval = prep_dma(ep, req, GFP_ATOMIC);
 			if (retval != 0)
 				goto finished;
 			/* write desc pointer to enable DMA */
@@ -1190,7 +1190,7 @@ udc_queue(struct usb_ep *usbep, struct usb_request *usbreq, gfp_t gfp)
 		 * for PPB modes, because of chain creation reasons
 		 */
 		if (ep->in) {
-			retval = prep_dma(ep, req, gfp);
+			retval = prep_dma(ep, req, GFP_ATOMIC);
 			if (retval != 0)
 				goto finished;
 		}
-- 
1.8.1.2

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