[PATCH 5.4 094/411] spi: spi-ti-qspi: Fix return value handling of wait_for_completion_timeout

Greg Kroah-Hartman
2022-06-13T11:12:09Z

From: Miaoqian Lin <linmq006@gmail.com>

[ Upstream commit 8b1ea69a63eb62f97cef63e6d816b64ed84e8760 ]

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: 5720ec0a6d26 ("spi: spi-ti-qspi: Add DMA support for QSPI mmap read")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Link: https://lore.kernel.org/r/20220411111034.24447-1-linmq006@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/spi/spi-ti-qspi.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c
index 6b6ef8944283..4bbad00244ab 100644
--- a/drivers/spi/spi-ti-qspi.c
+++ b/drivers/spi/spi-ti-qspi.c
@@ -401,6 +401,7 @@ static int ti_qspi_dma_xfer(struct ti_qspi *qspi, dma_addr_t dma_dst,
enum dma_ctrl_flags flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
struct dma_async_tx_descriptor *tx;
int ret;
+ unsigned long time_left;

tx = dmaengine_prep_dma_memcpy(chan, dma_dst, dma_src, len, flags);
if (!tx) {
@@ -420,9 +421,9 @@ static int ti_qspi_dma_xfer(struct ti_qspi *qspi, dma_addr_t dma_dst,
}

dma_async_issue_pending(chan);
- ret = wait_for_completion_timeout(&qspi->transfer_complete,
+ time_left = wait_for_completion_timeout(&qspi->transfer_complete,
msecs_to_jiffies(len));
- if (ret <= 0) {
+ if (time_left == 0) {
dmaengine_terminate_sync(chan);
dev_err(qspi->dev, "DMA wait_for_completion_timeout\n");
return -ETIMEDOUT;
--
2.35.1