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| author | Eric Biggers <ebiggers@google.com> | 2019-04-15 02:37:09 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2019-04-25 09:38:12 +0200 |
| commit | 877b5691f27a1aec0d9b53095a323e45c30069e2 (patch) | |
| tree | 59eba93e8d253fb0e12a0a2040de99e96e873933 /crypto/shash.c | |
| parent | crypto: nx - don't abuse shash MAY_SLEEP flag (diff) | |
| download | linux-877b5691f27a1aec0d9b53095a323e45c30069e2.tar.xz linux-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 'crypto/shash.c')
| -rw-r--r-- | crypto/shash.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/crypto/shash.c b/crypto/shash.c index 599468478f7b..e55c1f558bc3 100644 --- a/crypto/shash.c +++ b/crypto/shash.c @@ -238,7 +238,6 @@ static int shash_async_init(struct ahash_request *req) struct shash_desc *desc = ahash_request_ctx(req); desc->tfm = *ctx; - desc->flags = req->base.flags; return crypto_shash_init(desc); } @@ -293,7 +292,6 @@ static int shash_async_finup(struct ahash_request *req) struct shash_desc *desc = ahash_request_ctx(req); desc->tfm = *ctx; - desc->flags = req->base.flags; return shash_ahash_finup(req, desc); } @@ -328,7 +326,6 @@ static int shash_async_digest(struct ahash_request *req) struct shash_desc *desc = ahash_request_ctx(req); desc->tfm = *ctx; - desc->flags = req->base.flags; return shash_ahash_digest(req, desc); } @@ -344,7 +341,6 @@ static int shash_async_import(struct ahash_request *req, const void *in) struct shash_desc *desc = ahash_request_ctx(req); desc->tfm = *ctx; - desc->flags = req->base.flags; return crypto_shash_import(desc, in); } |