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dma: at_hdmac: fix invalid remaining bytes detection

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Found using smatch:
drivers/dma/at_hdmac.c:299 atc_get_bytes_left() warn: unsigned
'atchan->remain_desc' is never less than zero.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Alexandre Belloni 2014-08-01 18:51:46 +02:00 committed by Vinod Koul
parent cfc6abc3f1
commit 6758ddafad
1 changed files with 7 additions and 5 deletions
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12
drivers/dma/at_hdmac.c
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@ -294,14 +294,16 @@ static int atc_get_bytes_left(struct dma_chan *chan)
ret = -EINVAL;
goto out;
}
atchan->remain_desc -= (desc_cur->lli.ctrla & ATC_BTSIZE_MAX)
<< (desc_first->tx_width);
if (atchan->remain_desc < 0) {
count = (desc_cur->lli.ctrla & ATC_BTSIZE_MAX)
<< desc_first->tx_width;
if (atchan->remain_desc < count) {
ret = -EINVAL;
goto out;
} else {
ret = atchan->remain_desc;
}
atchan->remain_desc -= count;
ret = atchan->remain_desc;
} else {
/*
* Get residual bytes when current