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crypto: pcrypt - Make tfm_count an atomic_t

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The variable tfm_count is accessed by multiple threads without
locking.  This patch converts it to an atomic_t.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2015-05-22 20:34:22 +08:00
parent 30e4c010ae
commit a5a22e57f6
1 changed files with 4 additions and 4 deletions
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8
crypto/pcrypt.c
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@ -20,6 +20,7 @@
#include <crypto/algapi.h>
#include <crypto/internal/aead.h>
#include <linux/atomic.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
@ -61,7 +62,7 @@ static struct kset *pcrypt_kset;
struct pcrypt_instance_ctx {
struct crypto_aead_spawn spawn;
unsigned int tfm_count;
atomic_t tfm_count;
};
struct pcrypt_aead_ctx {
@ -278,9 +279,8 @@ static int pcrypt_aead_init_tfm(struct crypto_tfm *tfm)
struct pcrypt_aead_ctx *ctx = crypto_tfm_ctx(tfm);
struct crypto_aead *cipher;
ictx->tfm_count++;
cpu_index = ictx->tfm_count % cpumask_weight(cpu_online_mask);
cpu_index = (unsigned int)atomic_inc_return(&ictx->tfm_count) %
cpumask_weight(cpu_online_mask);
ctx->cb_cpu = cpumask_first(cpu_online_mask);
for (cpu = 0; cpu < cpu_index; cpu++)