From: Adam Guerin adam.guerin@intel.com
[ Upstream commit f99fb7d660f7c818105803f1f1915396a14d18ad ]
Check if delta_us is not zero and return -EINVAL if it is. delta_us is unlikely to be zero as there is a sleep between the reads of the two timestamps.
This is to fix the following warning when compiling the QAT driver using clang scan-build: drivers/crypto/intel/qat/qat_common/adf_clock.c:87:9: warning: Division by zero [core.DivideZero] 87 | temp = DIV_ROUND_CLOSEST_ULL(temp, delta_us); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Fixes: e2980ba57e79 ("crypto: qat - add measure clock frequency") Signed-off-by: Adam Guerin adam.guerin@intel.com Reviewed-by: Giovanni Cabiddu giovanni.cabiddu@intel.com Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/crypto/intel/qat/qat_common/adf_clock.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/crypto/intel/qat/qat_common/adf_clock.c b/drivers/crypto/intel/qat/qat_common/adf_clock.c index 01e0a389e462b..cf89f57de2a70 100644 --- a/drivers/crypto/intel/qat/qat_common/adf_clock.c +++ b/drivers/crypto/intel/qat/qat_common/adf_clock.c @@ -83,6 +83,9 @@ static int measure_clock(struct adf_accel_dev *accel_dev, u32 *frequency) }
delta_us = timespec_to_us(&ts3) - timespec_to_us(&ts1); + if (!delta_us) + return -EINVAL; + temp = (timestamp2 - timestamp1) * ME_CLK_DIVIDER * 10; temp = DIV_ROUND_CLOSEST_ULL(temp, delta_us); /*