crypto: nx - fix concurrency issue
The NX driver uses the transformation context to store several fields
containing data related to the state of the operations in progress.
Since a single tfm can be used by different kernel threads at the same
time, we need to protect the data stored into the context.
This patch makes use of spin locks to protect the data where a race
condition can happen.
Reviewed-by: Fionnuala Gunter <fin@linux.vnet.ibm.com>
Reviewed-by: Joy Latten <jmlatten@linux.vnet.ibm.com>
Signed-off-by: Marcelo Cerri <mhcerri@linux.vnet.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/drivers/crypto/nx/nx.h b/drivers/crypto/nx/nx.h
index 3232b18..14bb97f 100644
--- a/drivers/crypto/nx/nx.h
+++ b/drivers/crypto/nx/nx.h
@@ -117,6 +117,7 @@
};
struct nx_crypto_ctx {
+ spinlock_t lock; /* synchronize access to the context */
void *kmem; /* unaligned, kmalloc'd buffer */
size_t kmem_len; /* length of kmem */
struct nx_csbcpb *csbcpb; /* aligned page given to phyp @ hcall time */