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 --- drivers/crypto/omap-sham.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'drivers/crypto/omap-sham.c') diff --git a/drivers/crypto/omap-sham.c b/drivers/crypto/omap-sham.c index 0641185bd82f..51b20abac464 100644 --- a/drivers/crypto/omap-sham.c +++ b/drivers/crypto/omap-sham.c @@ -1055,7 +1055,6 @@ static int omap_sham_finish_hmac(struct ahash_request *req) SHASH_DESC_ON_STACK(shash, bctx->shash); shash->tfm = bctx->shash; - shash->flags = 0; /* not CRYPTO_TFM_REQ_MAY_SLEEP */ return crypto_shash_init(shash) ?: crypto_shash_update(shash, bctx->opad, bs) ?: @@ -1226,7 +1225,6 @@ static int omap_sham_shash_digest(struct crypto_shash *tfm, u32 flags, SHASH_DESC_ON_STACK(shash, tfm); shash->tfm = tfm; - shash->flags = flags & CRYPTO_TFM_REQ_MAY_SLEEP; return crypto_shash_digest(shash, data, len, out); } -- cgit v1.2.3