crypto: pcrypt - Make tfm_count an atomic_t
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>
diff --git a/crypto/pcrypt.c b/crypto/pcrypt.c
index 3942a9f..ff174b6 100644
--- a/crypto/pcrypt.c
+++ b/crypto/pcrypt.c
@@ -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 @@
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 @@
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++)