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dmaengine: edma: Check the current decriptor first in tx_status()

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It's likely that the caller investigates the status of a currently
active descriptor. Make that simple check first and only rumage in the
vchan list if that fails.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Joel Fernandes <joelf@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Thomas Gleixner 2014-04-28 14:19:51 -05:00 committed by Vinod Koul
parent b6205c3901
commit de13593971
1 changed files with 3 additions and 4 deletions
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7
drivers/dma/edma.c
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@ -852,11 +852,10 @@ static enum dma_status edma_tx_status(struct dma_chan *chan,
return ret;
spin_lock_irqsave(&echan->vchan.lock, flags);
vdesc = vchan_find_desc(&echan->vchan, cookie);
if (vdesc)
txstate->residue = to_edma_desc(&vdesc->tx)->residue;
else if (echan->edesc && echan->edesc->vdesc.tx.cookie == cookie)
if (echan->edesc && echan->edesc->vdesc.tx.cookie == cookie)
txstate->residue = echan->edesc->residue;
else if ((vdesc = vchan_find_desc(&echan->vchan, cookie)))
txstate->residue = to_edma_desc(&vdesc->tx)->residue;
spin_unlock_irqrestore(&echan->vchan.lock, flags);
return ret;