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| author | Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> | 2012-11-08 14:02:07 +0400 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2013-01-08 10:05:11 +0400 |
| commit | 2cbe7feba1ac521b5668609c35b94536bbbcd52f (patch) | |
| tree | 70373963c3c6f3ee91ad073a5f987d36de4e8175 /drivers/dma/dmaengine.c | |
| parent | e239345f642e6a255d0ba1e3d92c2f9ec5a44fbe (diff) | |
| download | linux-2cbe7feba1ac521b5668609c35b94536bbbcd52f.tar.xz | |
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.c | 5 |
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; } |