mirror of https://gitee.com/openkylin/linux.git
877b5691f2
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> |
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| .. | ||
| .gitignore | ||
| Kconfig | ||
| Makefile | ||
| aes-ce-core.S | ||
| aes-ce-glue.c | ||
| aes-cipher-core.S | ||
| aes-cipher-glue.c | ||
| aes-neonbs-core.S | ||
| aes-neonbs-glue.c | ||
| chacha-neon-core.S | ||
| chacha-neon-glue.c | ||
| crc32-ce-core.S | ||
| crc32-ce-glue.c | ||
| crct10dif-ce-core.S | ||
| crct10dif-ce-glue.c | ||
| ghash-ce-core.S | ||
| ghash-ce-glue.c | ||
| nh-neon-core.S | ||
| nhpoly1305-neon-glue.c | ||
| sha1-armv4-large.S | ||
| sha1-armv7-neon.S | ||
| sha1-ce-core.S | ||
| sha1-ce-glue.c | ||
| sha1.h | ||
| sha1_glue.c | ||
| sha1_neon_glue.c | ||
| sha2-ce-core.S | ||
| sha2-ce-glue.c | ||
| sha256-armv4.pl | ||
| sha256-core.S_shipped | ||
| sha256_glue.c | ||
| sha256_glue.h | ||
| sha256_neon_glue.c | ||
| sha512-armv4.pl | ||
| sha512-core.S_shipped | ||
| sha512-glue.c | ||
| sha512-neon-glue.c | ||
| sha512.h | ||