4.19-stable review patch. If anyone has any objections, please let me know.
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From: Ben Dooks ben.dooks@codethink.co.uk
[ Upstream commit 68a16708d2503b6303d67abd43801e2ca40c208d ]
In the s3c64xx_flush_fifo() code, the loops counter is post-decremented in the do { } while(test && loops--) condition. This means the loops is left at the unsigned equivalent of -1 if the loop times out. The test after will never pass as if tests for loops == 0.
Signed-off-by: Ben Dooks ben.dooks@codethink.co.uk Fixes: 230d42d422e7 ("spi: Add s3c64xx SPI Controller driver") Reviewed-by: Andi Shyti andi.shyti@kernel.org Link: https://patch.msgid.link/20240924134009.116247-2-ben.dooks@codethink.co.uk Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/spi/spi-s3c64xx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index d9420561236c2..108a087a2777c 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -211,7 +211,7 @@ static void s3c64xx_flush_fifo(struct s3c64xx_spi_driver_data *sdd) loops = msecs_to_loops(1); do { val = readl(regs + S3C64XX_SPI_STATUS); - } while (TX_FIFO_LVL(val, sdd) && loops--); + } while (TX_FIFO_LVL(val, sdd) && --loops);
if (loops == 0) dev_warn(&sdd->pdev->dev, "Timed out flushing TX FIFO\n"); @@ -224,7 +224,7 @@ static void s3c64xx_flush_fifo(struct s3c64xx_spi_driver_data *sdd) readl(regs + S3C64XX_SPI_RX_DATA); else break; - } while (loops--); + } while (--loops);
if (loops == 0) dev_warn(&sdd->pdev->dev, "Timed out flushing RX FIFO\n");