crypto: hisilicon/hpre - don't use GFP_KERNEL to alloc mem during softirq

The hpre encryption driver may be used to encrypt and decrypt packets
during the rx softirq, it is not allowed to use GFP_KERNEL.

Fixes: c8b4b477 ("crypto: hisilicon - add HiSilicon HPRE accelerator")
Signed-off-by: NZhengchao Shao <shaozhengchao@huawei.com>
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/hisilicon/hpre/hpre_crypto.c

@@ -252,7 +252,7 @@ static int hpre_prepare_dma_buf(struct hpre_asym_request *hpre_req,
 	if (unlikely(shift < 0))
 		return -EINVAL;
 
-	ptr = dma_alloc_coherent(dev, ctx->key_sz, tmp, GFP_KERNEL);
+	ptr = dma_alloc_coherent(dev, ctx->key_sz, tmp, GFP_ATOMIC);
 	if (unlikely(!ptr))
 		return -ENOMEM;