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 <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 0 insertions, 2 deletions

diff --git a/fs/ubifs/replay.c b/fs/ubifs/replay.c
index 0a0e65c07c6d..5c8a81a019a4 100644
--- a/fs/ubifs/replay.c
+++ b/fs/ubifs/replay.c
@@ -576,7 +576,6 @@ static int authenticate_sleb_hash(struct ubifs_info *c, struct shash_desc *log_h
 	SHASH_DESC_ON_STACK(hash_desc, c->hash_tfm);
 
 	hash_desc->tfm = c->hash_tfm;
-	hash_desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 
 	ubifs_shash_copy_state(c, log_hash, hash_desc);
 	return crypto_shash_final(hash_desc, hash);
@@ -587,7 +586,6 @@ static int authenticate_sleb_hmac(struct ubifs_info *c, u8 *hash, u8 *hmac)
 	SHASH_DESC_ON_STACK(hmac_desc, c->hmac_tfm);
 
 	hmac_desc->tfm = c->hmac_tfm;
-	hmac_desc->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
 
 	return crypto_shash_digest(hmac_desc, hash, c->hash_len, hmac);
 }