2018-07-23 08:27:44

by Jia-Ju Bai

Subject: [PATCH] crypto: qat: adf_aer: Replace GFP_ATOMIC with GFP_KERNEL in adf_dev_aer_schedule_reset()

adf_dev_aer_schedule_reset() is never called in atomic context, as it
calls wait_for_completion_timeout().

adf_dev_aer_schedule_reset() calls kzalloc() with GFP_ATOMIC,
which is not necessary.
GFP_ATOMIC can be replaced with GFP_KERNEL.

This is found by a static analysis tool named DCNS written by myself.
I also manually check the kernel code before reporting it.

Signed-off-by: Jia-Ju Bai <[email protected]>
---
drivers/crypto/qat/qat_common/adf_aer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/crypto/qat/qat_common/adf_aer.c b/drivers/crypto/qat/qat_common/adf_aer.c
index da8a2d3b5e9a..9225d060e18f 100644
--- a/drivers/crypto/qat/qat_common/adf_aer.c
+++ b/drivers/crypto/qat/qat_common/adf_aer.c
@@ -163,7 +163,7 @@ static int adf_dev_aer_schedule_reset(struct adf_accel_dev *accel_dev,
return 0;

set_bit(ADF_STATUS_RESTARTING, &accel_dev->status);
- reset_data = kzalloc(sizeof(*reset_data), GFP_ATOMIC);
+ reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
if (!reset_data)
return -ENOMEM;
reset_data->accel_dev = accel_dev;
--
2.17.0

2018-08-03 13:58:04

by Herbert Xu

Subject: Re: [PATCH] crypto: qat: adf_aer: Replace GFP_ATOMIC with GFP_KERNEL in adf_dev_aer_schedule_reset()

On Mon, Jul 23, 2018 at 04:27:44PM +0800, Jia-Ju Bai wrote:
> adf_dev_aer_schedule_reset() is never called in atomic context, as it
> calls wait_for_completion_timeout().
>
> adf_dev_aer_schedule_reset() calls kzalloc() with GFP_ATOMIC,
> which is not necessary.
> GFP_ATOMIC can be replaced with GFP_KERNEL.
>
> This is found by a static analysis tool named DCNS written by myself.
> I also manually check the kernel code before reporting it.
>
> Signed-off-by: Jia-Ju Bai <[email protected]>

Patch applied. Thanks.
--
Email: Herbert Xu <[email protected]>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt