From 684265d4a30f133162f06ddb2e5010608e60e4bb Mon Sep 17 00:00:00 2001
From: Andrew Morton <akpm@linux-foundation.org>
Date: Thu, 13 Jan 2011 15:47:25 -0800
Subject: [PATCH] mm/dmapool.c: use TASK_UNINTERRUPTIBLE in dma_pool_alloc()
As it stands this code will degenerate into a busy-wait if the calling task
has signal_pending().
Cc: Rolf Eike Beer <eike-kernel@sf-tec.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
mm/dmapool.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/dmapool.c b/mm/dmapool.c
index a2f6295b4df4..03bf3bb4519a 100644
--- a/mm/dmapool.c
+++ b/mm/dmapool.c
@@ -324,7 +324,7 @@ void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
if (mem_flags & __GFP_WAIT) {
DECLARE_WAITQUEUE(wait, current);
- __set_current_state(TASK_INTERRUPTIBLE);
+ __set_current_state(TASK_UNINTERRUPTIBLE);
__add_wait_queue(&pool->waitq, &wait);
spin_unlock_irqrestore(&pool->lock, flags);