tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
fork atom

crypto: aes-ni - Do not sleep when using the FPU

Because AES-NI instructions will touch XMM state, corresponding code
must be enclosed within kernel_fpu_begin/end, which used
preempt_disable/enable. So sleep should be prevented between
kernel_fpu_begin/end.

Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

authored by Huang Ying and committed by Herbert Xu 9251b64f e6efaa02

+4
unified split
+4
arch/x86/crypto/aesni-intel_glue.c
··· 198 198 199 199 blkcipher_walk_init(&walk, dst, src, nbytes); 200 200 err = blkcipher_walk_virt(desc, &walk); 201 + desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; 201 202 202 203 kernel_fpu_begin(); 203 204 while ((nbytes = walk.nbytes)) { ··· 222 221 223 222 blkcipher_walk_init(&walk, dst, src, nbytes); 224 223 err = blkcipher_walk_virt(desc, &walk); 224 + desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; 225 225 226 226 kernel_fpu_begin(); 227 227 while ((nbytes = walk.nbytes)) { ··· 268 266 269 267 blkcipher_walk_init(&walk, dst, src, nbytes); 270 268 err = blkcipher_walk_virt(desc, &walk); 269 + desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; 271 270 272 271 kernel_fpu_begin(); 273 272 while ((nbytes = walk.nbytes)) { ··· 292 289 293 290 blkcipher_walk_init(&walk, dst, src, nbytes); 294 291 err = blkcipher_walk_virt(desc, &walk); 292 + desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; 295 293 296 294 kernel_fpu_begin(); 297 295 while ((nbytes = walk.nbytes)) {