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authorTudor Ambarus <tudor.ambarus@microchip.com>2022-10-25 12:02:48 +0300
committerVinod Koul <vkoul@kernel.org>2022-11-08 08:13:57 +0300
commit28cbe5a0a46a6637adbda52337d7b2777fc04027 (patch)
tree3881f8bd9036c0173e79b96390142dec336ce18c /drivers/dma/at_hdmac.c
parent580ee84405c27d6ed419abe4d2b3de1968abdafd (diff)
downloadlinux-28cbe5a0a46a6637adbda52337d7b2777fc04027.tar.xz
dmaengine: at_hdmac: Fix impossible condition
The iterator can not be greater than ATC_MAX_DSCR_TRIALS, as the for loop will stop when i == ATC_MAX_DSCR_TRIALS. While here, use the common "i" name for the iterator. Fixes: 93dce3a6434f ("dmaengine: at_hdmac: fix residue computation") Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com> Cc: stable@vger.kernel.org Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com> Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com Link: https://lore.kernel.org/r/20221025090306.297886-15-tudor.ambarus@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/at_hdmac.c')
-rw-r--r--drivers/dma/at_hdmac.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 968a5aba47cd..afcbad3e1718 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c
@@ -318,7 +318,8 @@ static int atc_get_bytes_left(struct dma_chan *chan, dma_cookie_t cookie)
struct at_desc *desc_first = atc_first_active(atchan);
struct at_desc *desc;
int ret;
- u32 ctrla, dscr, trials;
+ u32 ctrla, dscr;
+ unsigned int i;
/*
* If the cookie doesn't match to the currently running transfer then
@@ -388,7 +389,7 @@ static int atc_get_bytes_left(struct dma_chan *chan, dma_cookie_t cookie)
dscr = channel_readl(atchan, DSCR);
rmb(); /* ensure DSCR is read before CTRLA */
ctrla = channel_readl(atchan, CTRLA);
- for (trials = 0; trials < ATC_MAX_DSCR_TRIALS; ++trials) {
+ for (i = 0; i < ATC_MAX_DSCR_TRIALS; ++i) {
u32 new_dscr;
rmb(); /* ensure DSCR is read after CTRLA */
@@ -414,7 +415,7 @@ static int atc_get_bytes_left(struct dma_chan *chan, dma_cookie_t cookie)
rmb(); /* ensure DSCR is read before CTRLA */
ctrla = channel_readl(atchan, CTRLA);
}
- if (unlikely(trials >= ATC_MAX_DSCR_TRIALS))
+ if (unlikely(i == ATC_MAX_DSCR_TRIALS))
return -ETIMEDOUT;
/* for the first descriptor we can be more accurate */