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/security/apparmor/crypto.c b/security/apparmor/crypto.c
index af03d98c7552..baba63bc66b1 100644
--- a/security/apparmor/crypto.c
+++ b/security/apparmor/crypto.c
@@ -43,7 +43,6 @@ char *aa_calc_hash(void *data, size_t len)
                 goto fail;
 
         desc->tfm = apparmor_tfm;
-        desc->flags = 0;
 
         error = crypto_shash_init(desc);
         if (error)
@@ -81,7 +80,6 @@ int aa_calc_profile_hash(struct aa_profile *profile, u32 version, void *start,
                 goto fail;
 
         desc->tfm = apparmor_tfm;
-        desc->flags = 0;
 
         error = crypto_shash_init(desc);
         if (error)