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xhci: Check all endpoints for LPM timeout 

If an endpoint is encountered that returns USB3_LPM_DEVICE_INITIATED, keep
checking further endpoints, as there might be periodic endpoints later
that return USB3_LPM_DISABLED due to shorter service intervals.

Without this, the code can set too high a maximum-exit-latency and
prevent the use of multiple USB3 cameras that should be able to work.

Cc: <stable@vger.kernel.org>
Signed-off-by: Jan Schmidt <jan@centricular.com>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/1570190373-30684-4-git-send-email-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jan Schmidt 2019-10-04 14:59:28 +03:00 committed by Greg Kroah-Hartman
parent cd9d9491e8
commit d500c63f80
1 changed files with 4 additions and 4 deletions
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8
drivers/usb/host/xhci.c
View File

@ -4674,12 +4674,12 @@ static int xhci_update_timeout_for_endpoint(struct xhci_hcd *xhci,
alt_timeout = xhci_call_host_update_timeout_for_endpoint(xhci, udev,
desc, state, timeout);
/* If we found we can't enable hub-initiated LPM, or
/* If we found we can't enable hub-initiated LPM, and
* the U1 or U2 exit latency was too high to allow
* device-initiated LPM as well, just stop searching.
* device-initiated LPM as well, then we will disable LPM
* for this device, so stop searching any further.
*/
if (alt_timeout == USB3_LPM_DISABLED ||
alt_timeout == USB3_LPM_DEVICE_INITIATED) {
if (alt_timeout == USB3_LPM_DISABLED) {
*timeout = alt_timeout;
return -E2BIG;
}