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authorBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>2012-11-08 10:02:07 +0000
committerVinod Koul <vinod.koul@intel.com>2013-01-07 22:05:11 -0800
commit2cbe7feba1ac521b5668609c35b94536bbbcd52f (patch)
tree70373963c3c6f3ee91ad073a5f987d36de4e8175 /drivers/dma/dmaengine.c
parente239345f642e6a255d0ba1e3d92c2f9ec5a44fbe (diff)
downloadlinux-2cbe7feba1ac521b5668609c35b94536bbbcd52f.tar.bz2
dmaengine: add cpu_relax() to busy-loop in dma_sync_wait()
Removal of the busy-loop from dma_sync_wait() is not a trivial task so just add cpu_relax() to the loop for now. Cc: Vinod Koul <vinod.koul@intel.com> Cc: Tomasz Figa <t.figa@samsung.com> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Dan Williams <djbw@fb.com>
Diffstat (limited to 'drivers/dma/dmaengine.c')
-rw-r--r--drivers/dma/dmaengine.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index d37cf95987b6..242b8c0a3de8 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -267,7 +267,10 @@ enum dma_status dma_sync_wait(struct dma_chan *chan, dma_cookie_t cookie)
pr_err("%s: timeout!\n", __func__);
return DMA_ERROR;
}
- } while (status == DMA_IN_PROGRESS);
+ if (status != DMA_IN_PROGRESS)
+ break;
+ cpu_relax();
+ } while (1);
return status;
}