Commit 814c96c9 authored by Mika Westerberg's avatar Mika Westerberg
Browse files

thunderbolt: Check for ring 0 in tb_tunnel_alloc_dma() 



Ring 0 cannot be used for anything else than control channel messages.
For this reason add a check to tb_tunnel_alloc_dma() and fail if someone
tries to do that.

Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
parent 44c026a7

drivers/thunderbolt/tunnel.c

+4 −0
Original line number Diff line number Diff line
@@ -1452,6 +1452,10 @@ struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi, 
	struct tb_path *path;

	int credits;



	/* Ring 0 is reserved for control channel */

	if (WARN_ON(!receive_ring || !transmit_ring))

		return NULL;



	if (receive_ring > 0)

		npaths++;

	if (transmit_ring > 0)