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| author |   Eric Biggers <ebiggers@google.com> | 2019-04-14 17:37:09 -0700 |
|---|---|---|
| committer |   Herbert Xu <herbert@gondor.apana.org.au> | 2019-04-25 15:38:12 +0800 |
| commit | 877b5691f27a1aec0d9b53095a323e45c30069e2 (patch) | |
| tree | 59eba93e8d253fb0e12a0a2040de99e96e873933 /net/bluetooth | |
| parent | crypto: nx - don't abuse shash MAY_SLEEP flag (diff) | |
| download | linux-dev-877b5691f27a1aec0d9b53095a323e45c30069e2.tar.xz linux-dev-877b5691f27a1aec0d9b53095a323e45c30069e2.zip | |
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>
Diffstat (limited to 'net/bluetooth')
| -rw-r--r-- | net/bluetooth/amp.c | 1 | ||||
| -rw-r--r-- | net/bluetooth/smp.c | 1 |
2 files changed, 0 insertions, 2 deletions
diff --git a/net/bluetooth/amp.c b/net/bluetooth/amp.c index 78bec8df8525..aaa39409eeb7 100644 --- a/net/bluetooth/amp.c +++ b/net/bluetooth/amp.c @@ -161,7 +161,6 @@ static int hmac_sha256(u8 *key, u8 ksize, char *plaintext, u8 psize, u8 *output) } shash->tfm = tfm; - shash->flags = CRYPTO_TFM_REQ_MAY_SLEEP; ret = crypto_shash_digest(shash, plaintext, psize, output); diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c index 621146d04c03..e68c715f8d37 100644 --- a/net/bluetooth/smp.c +++ b/net/bluetooth/smp.c @@ -183,7 +183,6 @@ static int aes_cmac(struct crypto_shash *tfm, const u8 k[16], const u8 *m, } desc->tfm = tfm; - desc->flags = 0; /* Swap key and message from LSB to MSB */ swap_buf(k, tmp, 16); |