Patch "crypto: hisilicon/sec - add some comments for soft fallback" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    crypto: hisilicon/sec - add some comments for soft fallback

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     crypto-hisilicon-sec-add-some-comments-for-soft-fall.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 601e423b732c0f019d2072d5a7f0381ce8bf0c5e
Author: Kai Ye <yekai13@xxxxxxxxxx>
Date:   Sat Jan 22 16:13:09 2022 +0800

    crypto: hisilicon/sec - add some comments for soft fallback
    
    [ Upstream commit e764d81d58070e66e61fb1b972c81eb9d2ea971e ]
    
    Modify the print of information that might lead to user misunderstanding.
    Currently only XTS mode need the fallback tfm when using 192bit key.
    Others algs not need soft fallback tfm. So others algs can return
    directly.
    
    Signed-off-by: Kai Ye <yekai13@xxxxxxxxxx>
    Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
    Stable-dep-of: fd337f852b26 ("crypto: hisilicon/sec2 - fix for aead icv error")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/crypto/hisilicon/sec2/sec_crypto.c b/drivers/crypto/hisilicon/sec2/sec_crypto.c
index 28c167e1be426..c8fa964238e7d 100644
--- a/drivers/crypto/hisilicon/sec2/sec_crypto.c
+++ b/drivers/crypto/hisilicon/sec2/sec_crypto.c
@@ -643,13 +643,15 @@ static int sec_skcipher_fbtfm_init(struct crypto_skcipher *tfm)
 	struct sec_cipher_ctx *c_ctx = &ctx->c_ctx;
 
 	c_ctx->fallback = false;
+
+	/* Currently, only XTS mode need fallback tfm when using 192bit key */
 	if (likely(strncmp(alg, "xts", SEC_XTS_NAME_SZ)))
 		return 0;
 
 	c_ctx->fbtfm = crypto_alloc_sync_skcipher(alg, 0,
 						  CRYPTO_ALG_NEED_FALLBACK);
 	if (IS_ERR(c_ctx->fbtfm)) {
-		pr_err("failed to alloc fallback tfm!\n");
+		pr_err("failed to alloc xts mode fallback tfm!\n");
 		return PTR_ERR(c_ctx->fbtfm);
 	}
 
@@ -810,7 +812,7 @@ static int sec_skcipher_setkey(struct crypto_skcipher *tfm, const u8 *key,
 	}
 
 	memcpy(c_ctx->c_key, key, keylen);
-	if (c_ctx->fallback) {
+	if (c_ctx->fallback && c_ctx->fbtfm) {
 		ret = crypto_sync_skcipher_setkey(c_ctx->fbtfm, key, keylen);
 		if (ret) {
 			dev_err(dev, "failed to set fallback skcipher key!\n");
@@ -2034,13 +2036,12 @@ static int sec_skcipher_soft_crypto(struct sec_ctx *ctx,
 				    struct skcipher_request *sreq, bool encrypt)
 {
 	struct sec_cipher_ctx *c_ctx = &ctx->c_ctx;
+	SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, c_ctx->fbtfm);
 	struct device *dev = ctx->dev;
 	int ret;
 
-	SYNC_SKCIPHER_REQUEST_ON_STACK(subreq, c_ctx->fbtfm);
-
 	if (!c_ctx->fbtfm) {
-		dev_err(dev, "failed to check fallback tfm\n");
+		dev_err_ratelimited(dev, "the soft tfm isn't supported in the current system.\n");
 		return -EINVAL;
 	}
 
@@ -2258,7 +2259,6 @@ static int sec_aead_param_check(struct sec_ctx *ctx, struct sec_req *sreq)
 	if (ctx->sec->qm.ver == QM_HW_V2) {
 		if (unlikely(!req->cryptlen || (!sreq->c_req.encrypt &&
 		    req->cryptlen <= authsize))) {
-			dev_err(dev, "Kunpeng920 not support 0 length!\n");
 			ctx->a_ctx.fallback = true;
 			return -EINVAL;
 		}