diff options
| author | Yoshitaka Ikeda <ikeda@nskint.co.jp> | 2021-09-08 08:29:12 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-18 21:16:24 +0300 |
| commit | 3409f88809a685fbf9ff6a3cd5599110370e647d (patch) | |
| tree | 02fc90531d98c013ab51ae3e58e6beca8fa95f32 /drivers/spi | |
| parent | bc79831b426b12d8e7b0b8e4c5226171085e4a73 (diff) | |
| download | linux-3409f88809a685fbf9ff6a3cd5599110370e647d.tar.xz | |
spi: Fixed division by zero warning
[ Upstream commit 09134c5322df9f105d9ed324051872d5d0e162aa ]
The reason for dividing by zero is because the dummy bus width is zero,
but if the dummy n bytes is zero, it indicates that there is no data transfer,
so there is no need for calculation.
Fixes: 7512eaf54190 ("spi: cadence-quadspi: Fix dummy cycle calculation when buswidth > 1")
Signed-off-by: Yoshitaka Ikeda <ikeda@nskint.co.jp>
Acked-by: Pratyush Yadav <p.yadav@ti.com>
Link: https://lore.kernel.org/r/OSZPR01MB70049C8F56ED8902852DF97B8BD49@OSZPR01MB7004.jpnprd01.prod.outlook.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/atmel-quadspi.c | 2 | ||||
| -rw-r--r-- | drivers/spi/spi-bcm-qspi.c | 3 | ||||
| -rw-r--r-- | drivers/spi/spi-mtk-nor.c | 2 | ||||
| -rw-r--r-- | drivers/spi/spi-stm32-qspi.c | 2 |
4 files changed, 5 insertions, 4 deletions
diff --git a/drivers/spi/atmel-quadspi.c b/drivers/spi/atmel-quadspi.c index 95d4fa32c299..92d9610df1fd 100644 --- a/drivers/spi/atmel-quadspi.c +++ b/drivers/spi/atmel-quadspi.c @@ -310,7 +310,7 @@ static int atmel_qspi_set_cfg(struct atmel_qspi *aq, return mode; ifr |= atmel_qspi_modes[mode].config; - if (op->dummy.buswidth && op->dummy.nbytes) + if (op->dummy.nbytes) dummy_cycles = op->dummy.nbytes * 8 / op->dummy.buswidth; /* diff --git a/drivers/spi/spi-bcm-qspi.c b/drivers/spi/spi-bcm-qspi.c index ea1865c08fc2..151e154284bd 100644 --- a/drivers/spi/spi-bcm-qspi.c +++ b/drivers/spi/spi-bcm-qspi.c @@ -395,7 +395,8 @@ static int bcm_qspi_bspi_set_flex_mode(struct bcm_qspi *qspi, if (addrlen == BSPI_ADDRLEN_4BYTES) bpp = BSPI_BPP_ADDR_SELECT_MASK; - bpp |= (op->dummy.nbytes * 8) / op->dummy.buswidth; + if (op->dummy.nbytes) + bpp |= (op->dummy.nbytes * 8) / op->dummy.buswidth; switch (width) { case SPI_NBITS_SINGLE: diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c index 41e7b341d261..5c93730615f8 100644 --- a/drivers/spi/spi-mtk-nor.c +++ b/drivers/spi/spi-mtk-nor.c @@ -160,7 +160,7 @@ static bool mtk_nor_match_read(const struct spi_mem_op *op) { int dummy = 0; - if (op->dummy.buswidth) + if (op->dummy.nbytes) dummy = op->dummy.nbytes * BITS_PER_BYTE / op->dummy.buswidth; if ((op->data.buswidth == 2) || (op->data.buswidth == 4)) { diff --git a/drivers/spi/spi-stm32-qspi.c b/drivers/spi/spi-stm32-qspi.c index 27f35aa2d746..514337c86d2c 100644 --- a/drivers/spi/spi-stm32-qspi.c +++ b/drivers/spi/spi-stm32-qspi.c @@ -397,7 +397,7 @@ static int stm32_qspi_send(struct spi_mem *mem, const struct spi_mem_op *op) ccr |= FIELD_PREP(CCR_ADSIZE_MASK, op->addr.nbytes - 1); } - if (op->dummy.buswidth && op->dummy.nbytes) + if (op->dummy.nbytes) ccr |= FIELD_PREP(CCR_DCYC_MASK, op->dummy.nbytes * 8 / op->dummy.buswidth); |