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thunderbolt: Use maximum USB3 link rate when reclaiming if link is not up

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If the USB3 link is not up the actual link rate is 0 so when reclaiming
bandwidth we should look at maximum supported link rate instead.

Cc: stable@vger.kernel.org
Fixes: 0bd680cd90 ("thunderbolt: Add USB3 bandwidth management")
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
This commit is contained in:
Mika Westerberg 2020-06-24 21:45:03 +03:00
parent 8824d19b45
commit 813050e0a9
1 changed files with 10 additions and 2 deletions
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12
drivers/thunderbolt/tunnel.c
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@ -951,10 +951,18 @@ static void tb_usb3_reclaim_available_bandwidth(struct tb_tunnel *tunnel,
int ret, max_rate, allocate_up, allocate_down;
ret = usb4_usb3_port_actual_link_rate(tunnel->src_port);
if (ret <= 0) {
tb_tunnel_warn(tunnel, "tunnel is not up\n");
if (ret < 0) {
tb_tunnel_warn(tunnel, "failed to read actual link rate\n");
return;
} else if (!ret) {
/* Use maximum link rate if the link valid is not set */
ret = usb4_usb3_port_max_link_rate(tunnel->src_port);
if (ret < 0) {
tb_tunnel_warn(tunnel, "failed to read maximum link rate\n");
return;
}
}
/*
* 90% of the max rate can be allocated for isochronous
* transfers.