6.6-stable review patch. If anyone has any objections, please let me know.
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From: Mathias Nyman mathias.nyman@linux.intel.com
commit 79989bd4ab86404743953fa382af0a22900050cf upstream.
Usb device connect may not be detected after runtime resume if xHC is reset during resume.
In runtime resume cases xhci_resume() will only resume roothubs if there are pending port events. If the xHC host is reset during runtime resume due to a Save/Restore Error (SRE) then these pending port events won't be detected as PORTSC change bits are not immediately set by host after reset.
Unconditionally resume roothubs if xHC is reset during resume to ensure device connections are detected.
Also return early with error code if starting xHC fails after reset.
Issue was debugged and a similar solution suggested by Remi Pommarel. Using this instead as it simplifies future refactoring.
Reported-by: Remi Pommarel repk@triplefau.lt Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218987 Suggested-by: Remi Pommarel repk@triplefau.lt Tested-by: Remi Pommarel repk@triplefau.lt Cc: stable@vger.kernel.org Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com Link: https://lore.kernel.org/r/20240627145523.1453155-2-mathias.nyman@linux.intel... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/host/xhci.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-)
--- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1084,10 +1084,20 @@ int xhci_resume(struct xhci_hcd *xhci, p xhci_dbg(xhci, "Start the secondary HCD\n"); retval = xhci_run(xhci->shared_hcd); } - + if (retval) + return retval; + /* + * Resume roothubs unconditionally as PORTSC change bits are not + * immediately visible after xHC reset + */ hcd->state = HC_STATE_SUSPENDED; - if (xhci->shared_hcd) + + if (xhci->shared_hcd) { xhci->shared_hcd->state = HC_STATE_SUSPENDED; + usb_hcd_resume_root_hub(xhci->shared_hcd); + } + usb_hcd_resume_root_hub(hcd); + goto done; }
@@ -1111,7 +1121,6 @@ int xhci_resume(struct xhci_hcd *xhci, p
xhci_dbc_resume(xhci);
- done: if (retval == 0) { /* * Resume roothubs only if there are pending events. @@ -1137,6 +1146,7 @@ int xhci_resume(struct xhci_hcd *xhci, p usb_hcd_resume_root_hub(hcd); } } +done: /* * If system is subject to the Quirk, Compliance Mode Timer needs to * be re-initialized Always after a system resume. Ports are subject