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dmaengine: add cpu_relax() to busy-loop in dma_sync_wait()

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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>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2012-11-08 10:02:07 +00:00 committed by Vinod Koul
parent e239345f64
commit 2cbe7feba1
1 changed files with 4 additions and 1 deletions
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5
drivers/dma/dmaengine.c
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@ -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;
}