linux-kernel - [PATCH] staging: emxx_udc: Replace GFP_KERNEL with GFP

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Message-ID: <20150220131336.GA22731@kt-Inspiron-3542>
Date:	Fri, 20 Feb 2015 18:43:53 +0530
From:	Tapasweni Pathak <tapaswenipathak@...il.com>
To:	gregkh@...uxfoundation.org, vinc94@...il.com,
	roberta.dobrescu@...il.com, sachin.kamat@...sung.com,
	ebru.akagunduz@...il.com, damm+renesas@...nsource.se,
	chris@...vick.com, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Cc:	tapaswenipathak@...il.com, julia.lawall@...6.fr
Subject: [PATCH] staging: emxx_udc: Replace GFP_KERNEL with GFP_ATOMIC

To avoid deadlock, do not call blocking functions with spinlocks held.

Replace GFP_KERNEL with GFP_ATOMIC, as the latter will fail if the pile
doesn't have enough free pages but will not sleep and hence deadlock can
be avoided.

Found by Coccinelle.

Signed-off-by: Tapasweni Pathak <tapaswenipathak@...il.com>
---
Is there any other way this can be fixed as it is better to avoid GFP_ATOMIC?

 drivers/staging/emxx_udc/emxx_udc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/emxx_udc/emxx_udc.c b/drivers/staging/emxx_udc/emxx_udc.c
index 4be646c..6c1de27 100644
--- a/drivers/staging/emxx_udc/emxx_udc.c
+++ b/drivers/staging/emxx_udc/emxx_udc.c
@@ -2794,7 +2794,7 @@ static int nbu2ss_ep_queue(
 		if (ep->virt_buf == NULL)
 			ep->virt_buf = (u8 *)dma_alloc_coherent(
 				NULL, PAGE_SIZE,
-				&ep->phys_buf, GFP_KERNEL | GFP_DMA);
+				&ep->phys_buf, GFP_ATOMIC | GFP_DMA);
 		if (ep->epnum > 0)  {
 			if (ep->direct == USB_DIR_IN)
 				memcpy(ep->virt_buf, req->req.buf,
--
1.7.9.5

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