From b6f3fefe1fa1e8ea8f6b654e7d552253373cd1c0 Mon Sep 17 00:00:00 2001 From: Suresh Siddha Date: Mon, 17 Sep 2012 10:37:26 -0700 Subject: [PATCH] crypto, tcrypt: remove local_bh_disable/enable() around local_irq_disable/enable() Ran into this while looking at some new crypto code using FPU hitting a WARN_ON_ONCE(!irq_fpu_usable()) in the kernel_fpu_begin() on a x86 kernel that uses the new eagerfpu model. In short, current eagerfpu changes return 0 for interrupted_kernel_fpu_idle() and the in_interrupt() thinks it is in the interrupt context because of the local_bh_disable(). Thus resulting in the WARN_ON(). Remove the local_bh_disable/enable() calls around the existing local_irq_disable/enable() calls. local_irq_disable/enable() already disables the BH. [ If there are any other legitimate users calling kernel_fpu_begin() from the process context but with BH disabled, then we can look into fixing the irq_fpu_usable() in future. ] Signed-off-by: Suresh Siddha Cc: Tim Chen Signed-off-by: Herbert Xu --- crypto/tcrypt.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/crypto/tcrypt.c b/crypto/tcrypt.c index 871076b1e0ab..1ac77b720b2d 100644 --- a/crypto/tcrypt.c +++ b/crypto/tcrypt.c @@ -97,7 +97,6 @@ static int test_cipher_cycles(struct blkcipher_desc *desc, int enc, int ret = 0; int i; - local_bh_disable(); local_irq_disable(); /* Warm-up run. */ @@ -130,7 +129,6 @@ static int test_cipher_cycles(struct blkcipher_desc *desc, int enc, out: local_irq_enable(); - local_bh_enable(); if (ret == 0) printk("1 operation in %lu cycles (%d bytes)\n", @@ -300,7 +298,6 @@ static int test_hash_cycles_digest(struct hash_desc *desc, int i; int ret; - local_bh_disable(); local_irq_disable(); /* Warm-up run. */ @@ -327,7 +324,6 @@ static int test_hash_cycles_digest(struct hash_desc *desc, out: local_irq_enable(); - local_bh_enable(); if (ret) return ret; @@ -348,7 +344,6 @@ static int test_hash_cycles(struct hash_desc *desc, struct scatterlist *sg, if (plen == blen) return test_hash_cycles_digest(desc, sg, blen, out); - local_bh_disable(); local_irq_disable(); /* Warm-up run. */ @@ -391,7 +386,6 @@ static int test_hash_cycles(struct hash_desc *desc, struct scatterlist *sg, out: local_irq_enable(); - local_bh_enable(); if (ret) return ret; -- 2.20.1