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mtd: rawnand: Fix return value check of wait_for_completion_timeout

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[ Upstream commit 084c16ab42 ]

wait_for_completion_timeout() returns unsigned long not int.
It returns 0 if timed out, and positive if completed.
The check for <= 0 is ambiguous and should be == 0 here
indicating timeout which is the only error case.

Fixes: 83738d87e3 ("mtd: sh_flctl: Add DMA capabilty")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220412083435.29254-1-linmq006@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Miaoqian Lin 2022-04-12 08:34:31 +00:00 committed by Greg Kroah-Hartman
parent 223c5b579c
commit 7d3c0c1276
1 changed files with 8 additions and 6 deletions
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14
drivers/mtd/nand/sh_flctl.c
View file

@ -399,7 +399,8 @@ static int flctl_dma_fifo0_transfer(struct sh_flctl *flctl, unsigned long *buf,
dma_addr_t dma_addr;
dma_cookie_t cookie;
uint32_t reg;
int ret;
int ret = 0;
unsigned long time_left;
if (dir == DMA_FROM_DEVICE) {
chan = flctl->chan_fifo0_rx;
@ -440,13 +441,14 @@ static int flctl_dma_fifo0_transfer(struct sh_flctl *flctl, unsigned long *buf,
goto out;
}
ret =
time_left =
wait_for_completion_timeout(&flctl->dma_complete,
msecs_to_jiffies(3000));
if (ret <= 0) {
if (time_left == 0) {
dmaengine_terminate_all(chan);
dev_err(&flctl->pdev->dev, "wait_for_completion_timeout\n");
ret = -ETIMEDOUT;
}
out:
@ -456,7 +458,7 @@ static int flctl_dma_fifo0_transfer(struct sh_flctl *flctl, unsigned long *buf,
dma_unmap_single(chan->device->dev, dma_addr, len, dir);
/* ret > 0 is success */
/* ret == 0 is success */
return ret;
}
@ -480,7 +482,7 @@ static void read_fiforeg(struct sh_flctl *flctl, int rlen, int offset)
/* initiate DMA transfer */
if (flctl->chan_fifo0_rx && rlen >= 32 &&
flctl_dma_fifo0_transfer(flctl, buf, rlen, DMA_FROM_DEVICE) > 0)
!flctl_dma_fifo0_transfer(flctl, buf, rlen, DMA_FROM_DEVICE))
goto convert; /* DMA success */
/* do polling transfer */
@ -539,7 +541,7 @@ static void write_ec_fiforeg(struct sh_flctl *flctl, int rlen,
/* initiate DMA transfer */
if (flctl->chan_fifo0_tx && rlen >= 32 &&
flctl_dma_fifo0_transfer(flctl, buf, rlen, DMA_TO_DEVICE) > 0)
!flctl_dma_fifo0_transfer(flctl, buf, rlen, DMA_TO_DEVICE))
return; /* DMA success */
/* do polling transfer */