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| author | Suresh Siddha <suresh.b.siddha@intel.com> | 2012-09-17 10:37:26 -0700 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2012-09-27 13:32:15 +0800 |
| commit | b6f3fefe1fa1e8ea8f6b654e7d552253373cd1c0 (patch) | |
| tree | 756ea912317e9a04fe5a5b4dfeb996e2511f10e9 /crypto | |
| parent | 35c41db8f9ca76d7ca3cdc9003ac5a53292026be (diff) | |
| download | lwn-b6f3fefe1fa1e8ea8f6b654e7d552253373cd1c0.tar.gz lwn-b6f3fefe1fa1e8ea8f6b654e7d552253373cd1c0.zip | |
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 <suresh.b.siddha@intel.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto')
| -rw-r--r-- | crypto/tcrypt.c | 6 |
1 files changed, 0 insertions, 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; |