afs: Use a dynamic port if 7001 is in use

It is not required that the afs client operate on port 7001.
The port could be in use because another kernel or userspace
client has already bound to it.

If the port is in use, just fallback to using a dynamic port.

Signed-off-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>

diff --git a/fs/afs/rxrpc.c b/fs/afs/rxrpc.c
index 06a51d70b82b6e7d3028fc02a85c5ebda3004663..bd44ae8b63d856949b91615ff785ba671d2283f4 100644 (file)
--- a/fs/afs/rxrpc.c
+++ b/fs/afs/rxrpc.c
@@ -61,6 +61,10 @@ int afs_open_socket(struct afs_net *net)
        srx.transport.sin6.sin6_port    = htons(AFS_CM_PORT);
 
        ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
+       if (ret == -EADDRINUSE) {
+               srx.transport.sin6.sin6_port = 0;
+               ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
+       }
        if (ret < 0)
                goto error_2;