From 877b5691f27a1aec0d9b53095a323e45c30069e2 Mon Sep 17 00:00:00 2001 From: Eric Biggers Date: Sun, 14 Apr 2019 17:37:09 -0700 Subject: crypto: shash - remove shash_desc::flags The flags field in 'struct shash_desc' never actually does anything. The only ostensibly supported flag is CRYPTO_TFM_REQ_MAY_SLEEP. However, no shash algorithm ever sleeps, making this flag a no-op. With this being the case, inevitably some users who can't sleep wrongly pass MAY_SLEEP. These would all need to be fixed if any shash algorithm actually started sleeping. For example, the shash_ahash_*() functions, which wrap a shash algorithm with the ahash API, pass through MAY_SLEEP from the ahash API to the shash API. However, the shash functions are called under kmap_atomic(), so actually they're assumed to never sleep. Even if it turns out that some users do need preemption points while hashing large buffers, we could easily provide a helper function crypto_shash_update_large() which divides the data into smaller chunks and calls crypto_shash_update() and cond_resched() for each chunk. It's not necessary to have a flag in 'struct shash_desc', nor is it necessary to make individual shash algorithms aware of this at all. Therefore, remove shash_desc::flags, and document that the crypto_shash_*() functions can be called from any context. Signed-off-by: Eric Biggers Signed-off-by: Herbert Xu --- crypto/testmgr.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'crypto/testmgr.c') diff --git a/crypto/testmgr.c b/crypto/testmgr.c index 87abfd1ce232..2bd89a65e9e7 100644 --- a/crypto/testmgr.c +++ b/crypto/testmgr.c @@ -1328,7 +1328,6 @@ static void generate_random_hash_testvec(struct crypto_shash *tfm, /* Digest */ desc->tfm = tfm; - desc->flags = 0; vec->digest_error = crypto_shash_digest(desc, vec->plaintext, vec->psize, (u8 *)vec->digest); done: @@ -3027,7 +3026,6 @@ static int alg_test_crc32c(const struct alg_test_desc *desc, u32 *ctx = (u32 *)shash_desc_ctx(shash); shash->tfm = tfm; - shash->flags = 0; *ctx = 420553207; err = crypto_shash_final(shash, (u8 *)&val); -- cgit v1.2.3-55-g7522