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thunderbolt: Handle rejected Thunderbolt devices

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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: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
This commit is contained in:
Mika Westerberg 2017-09-14 13:59:10 +03:00
parent e4be8c9b6a
commit cb653eecde
2 changed files with 7 additions and 0 deletions
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6
drivers/thunderbolt/icm.c
View File

@ -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",

1
drivers/thunderbolt/tb_msgs.h
View File

@ -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;