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| author |   Yoshitaka Ikeda <ikeda@nskint.co.jp> | 2021-07-15 16:21:32 +0000 |
|---|---|---|
| committer |   Mark Brown <broonie@kernel.org> | 2021-07-15 19:55:48 +0100 |
| commit | 55cef88bbf12f3bfbe5c2379a8868a034707e755 (patch) | |
| tree | 89f2aaaca0afac82f12378c3b92e1334fd38cf1c /drivers/spi | |
| parent | spi: mediatek: move devm_spi_register_master position (diff) | |
| download | linux-dev-55cef88bbf12f3bfbe5c2379a8868a034707e755.tar.xz linux-dev-55cef88bbf12f3bfbe5c2379a8868a034707e755.zip | |
spi: spi-cadence-quadspi: Fix division by zero warning
Fix below division by zero warning:
- Added an if statement because buswidth can be zero, resulting in division by zero.
- The modified code was based on another driver (atmel-quadspi).
[ 0.795337] Division by zero in kernel.
:
[ 0.834051] [<807fd40c>] (__div0) from [<804e1acc>] (Ldiv0+0x8/0x10)
[ 0.839097] [<805f0710>] (cqspi_exec_mem_op) from [<805edb4c>] (spi_mem_exec_op+0x3b0/0x3f8)
Fixes: 7512eaf54190 ("spi: cadence-quadspi: Fix dummy cycle calculation when buswidth > 1")
Signed-off-by: Yoshitaka Ikeda <ikeda@nskint.co.jp>
Link: https://lore.kernel.org/r/ed989af6-da88-4e0b-9ed8-126db6cad2e4@nskint.co.jp
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-cadence-quadspi.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c index 7a00346ff9b9..13d1f0ce618e 100644 --- a/drivers/spi/spi-cadence-quadspi.c +++ b/drivers/spi/spi-cadence-quadspi.c @@ -307,11 +307,13 @@ static unsigned int cqspi_calc_rdreg(struct cqspi_flash_pdata *f_pdata) static unsigned int cqspi_calc_dummy(const struct spi_mem_op *op, bool dtr) { - unsigned int dummy_clk; + unsigned int dummy_clk = 0; - dummy_clk = op->dummy.nbytes * (8 / op->dummy.buswidth); - if (dtr) - dummy_clk /= 2; + if (op->dummy.buswidth && op->dummy.nbytes) { + dummy_clk = op->dummy.nbytes * (8 / op->dummy.buswidth); + if (dtr) + dummy_clk /= 2; + } return dummy_clk; } |