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| author | Alexandre Belloni | 2014-08-01 18:51:46 +0200 |
|---|---|---|
| committer | Vinod Koul | 2014-08-07 18:22:27 +0200 |
| commit | 6758ddafad55fc8e665bb03ff103d3e410483fe9 (patch) | |
| tree | 9f6455b28f7d442029844b505fe03a30cb012520 /drivers/dma/at_hdmac.c | |
| parent | dmaengine: nbpfaxi: don't build this driver where it cannot be used (diff) | |
| download | kernel-qcow2-linux-6758ddafad55fc8e665bb03ff103d3e410483fe9.tar.gz kernel-qcow2-linux-6758ddafad55fc8e665bb03ff103d3e410483fe9.tar.xz kernel-qcow2-linux-6758ddafad55fc8e665bb03ff103d3e410483fe9.zip | |
dma: at_hdmac: fix invalid remaining bytes detection
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>
Diffstat (limited to 'drivers/dma/at_hdmac.c')
| -rw-r--r-- | drivers/dma/at_hdmac.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index d20ab1b73a3a..ca9dd2613283 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -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 |