crypto: virtio - Replace GFP_ATOMIC with GFP_KERNEL in __virtio_crypto_ablkcipher_do_...

__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>

diff --git a/drivers/crypto/virtio/virtio_crypto_algs.c b/drivers/crypto/virtio/virtio_crypto_algs.c
index 7a104f6..2c573d1 100644 (file)
--- a/drivers/crypto/virtio/virtio_crypto_algs.c
+++ b/drivers/crypto/virtio/virtio_crypto_algs.c
@@ -383,12 +383,12 @@ __virtio_crypto_ablkcipher_do_req(struct virtio_crypto_sym_request *vc_sym_req,
 
        /* Why 3?  outhdr + iv + inhdr */
        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));
        if (!sgs)
                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));
        if (!req_data) {
                kfree(sgs);