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Commit cb653eec authored by Mika Westerberg's avatar Mika Westerberg
Browse files

thunderbolt: Handle rejected Thunderbolt devices 



The ICM firmware rejects devices if the maximum topology limit is
exceeded (more than 6 devices are connected). If that happens just log a
message to the kernel message buffer and bail out.

Signed-off-by: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: default avatarAndy Shevchenko <andy.shevchenko@gmail.com>
parent e4be8c9b

drivers/thunderbolt/icm.c

+6 −0
Original line number Diff line number Diff line
@@ -410,6 +410,12 @@ icm_fr_device_connected(struct tb *tb, const struct icm_pkg_header *hdr) 
		ICM_LINK_INFO_DEPTH_SHIFT;

	authorized = pkg->link_info & ICM_LINK_INFO_APPROVED;



	if (pkg->link_info & ICM_LINK_INFO_REJECTED) {

		tb_info(tb, "switch at %u.%u was rejected by ICM firmware because topology limit exceeded\n",

			link, depth);

		return;

	}



	ret = icm->get_route(tb, link, depth, &route);

	if (ret) {

		tb_err(tb, "failed to find route string for switch at %u.%u\n",

drivers/thunderbolt/tb_msgs.h

+1 −0
Original line number Diff line number Diff line
@@ -176,6 +176,7 @@ struct icm_fr_event_device_connected { 
#define ICM_LINK_INFO_DEPTH_SHIFT	4

#define ICM_LINK_INFO_DEPTH_MASK	GENMASK(7, 4)

#define ICM_LINK_INFO_APPROVED		BIT(8)

#define ICM_LINK_INFO_REJECTED		BIT(9)



struct icm_fr_pkg_approve_device {

	struct icm_pkg_header hdr;