rpmsg_retarget: check if proxy is created

Only do rpmsg_retarget if proxy is created.

Signed-off-by: Wendy Liang <jliang@xilinx.com>

diff --git a/lib/proxy/rpmsg_retarget.c b/lib/proxy/rpmsg_retarget.c
index 661876e6df08bc8693df854631351e0bc8f699af..8b6270a85541df8eafaef3529e39c68d362592a7 100644 (file)
--- a/lib/proxy/rpmsg_retarget.c
+++ b/lib/proxy/rpmsg_retarget.c
@@ -9,7 +9,7 @@
  *     This files contains rpmsg based redefinitions for C RTL system calls
  *     such as _open, _read, _write, _close.
  *************************************************************************/
-static struct _rpc_data *rpc_data;
+static struct _rpc_data *rpc_data = 0;
 
 int send_rpc(void *data, int len);
 
@@ -70,6 +70,7 @@ int rpmsg_retarget_deinit(struct rpmsg_channel *rp_chnl)
        metal_mutex_deinit(&rpc_data->rpc_lock);
        rpmsg_destroy_ept(rpc_data->rp_ept);
        env_free_memory(rpc_data);
+       rpc_data = NULL;
 
        return 0;
 }
@@ -108,6 +109,9 @@ int _open(const char *filename, int flags, int mode)
                return -1;
        }
 
+       if (!rpc_data)
+               return retval;
+
        /* Construct rpc payload */
        rpc_data->rpc->id = OPEN_SYSCALL_ID;
        rpc_data->rpc->sys_call_args.int_field1 = flags;
@@ -149,6 +153,8 @@ int _read(int fd, char *buffer, int buflen)
 
        if (!buffer || !buflen)
                return retval;
+       if (!rpc_data)
+               return retval;
 
        /* Construct rpc payload */
        rpc_data->rpc->id = READ_SYSCALL_ID;
@@ -198,6 +204,8 @@ int _write(int fd, const char *ptr, int len)
        if (fd == 1) {
                null_term = 1;
        }
+       if (!rpc_data)
+               return retval;
 
        rpc_data->rpc->id = WRITE_SYSCALL_ID;
        rpc_data->rpc->sys_call_args.int_field1 = fd;
@@ -240,6 +248,8 @@ int _close(int fd)
        int payload_size = sizeof(struct _sys_rpc);
        int retval = -1;
 
+       if (!rpc_data)
+               return retval;
        rpc_data->rpc->id = CLOSE_SYSCALL_ID;
        rpc_data->rpc->sys_call_args.int_field1 = fd;
        rpc_data->rpc->sys_call_args.int_field2 = 0;    /*not used */