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crypto: virtio - Replace GFP_ATOMIC with GFP_KERNEL in __virtio_crypto_ablkcipher_do_req() 

__virtio_crypto_ablkcipher_do_req() is never called in atomic context.

__virtio_crypto_ablkcipher_do_req() is only called by
virtio_crypto_ablkcipher_crypt_req(), which is only called by
virtcrypto_find_vqs() that is never called in atomic context.

__virtio_crypto_ablkcipher_do_req() calls kzalloc_node() 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 <baijiaju1990@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Jia-Ju Bai 2018-07-23 16:43:46 +08:00 committed by Herbert Xu
parent 8e8c0386b1
commit f6adeef77e
1 changed files with 2 additions and 2 deletions
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4
drivers/crypto/virtio/virtio_crypto_algs.c
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@ -383,12 +383,12 @@ __virtio_crypto_ablkcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
/* Why 3? outhdr + iv + inhdr */ /* Why 3? outhdr + iv + inhdr */
sg_total = src_nents + dst_nents + 3; sg_total = src_nents + dst_nents + 3;
sgs = kcalloc_node(sg_total, sizeof(*sgs), GFP_ATOMIC, sgs = kcalloc_node(sg_total, sizeof(*sgs), GFP_KERNEL,
dev_to_node(&vcrypto->vdev->dev)); dev_to_node(&vcrypto->vdev->dev));
if (!sgs) if (!sgs)
return -ENOMEM; return -ENOMEM;
req_data = kzalloc_node(sizeof(*req_data), GFP_ATOMIC, req_data = kzalloc_node(sizeof(*req_data), GFP_KERNEL,
dev_to_node(&vcrypto->vdev->dev)); dev_to_node(&vcrypto->vdev->dev));
if (!req_data) { if (!req_data) {
kfree(sgs); kfree(sgs);