crypto: ccp - Ignore unconfigured CCP device on suspend/resume

If a CCP is unconfigured (e.g. there are no available queues) then
there will be no data structures allocated for the device. Thus, we
must check for validity of a pointer before trying to access structure
members.

Fixes: 720419f01832f ("crypto: ccp - Introduce the AMD Secure Processor device")
Cc: <stable@vger.kernel.org>
Signed-off-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/ccp/ccp-dev.c b/drivers/crypto/ccp/ccp-dev.c
index f3ff36f..db99af8 100644 (file)
--- a/drivers/crypto/ccp/ccp-dev.c
+++ b/drivers/crypto/ccp/ccp-dev.c
@@ -540,6 +540,10 @@ int ccp_dev_suspend(struct sp_device *sp, pm_message_t state)
        unsigned long flags;
        unsigned int i;
 
+       /* If there's no device there's nothing to do */
+       if (!ccp)
+               return 0;
+
        spin_lock_irqsave(&ccp->cmd_lock, flags);
 
        ccp->suspending = 1;
@@ -564,6 +568,10 @@ int ccp_dev_resume(struct sp_device *sp)
        unsigned long flags;
        unsigned int i;
 
+       /* If there's no device there's nothing to do */
+       if (!ccp)
+               return 0;
+
        spin_lock_irqsave(&ccp->cmd_lock, flags);
 
        ccp->suspending = 0;