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From: Mathias Nyman <mathias.nyman@linux.intel.com>
To: <gregkh@linuxfoundation.org>
Cc: <linux-usb@vger.kernel.org>,
	Mathias Nyman <mathias.nyman@linux.intel.com>,
	stable@vger.kernel.org
Subject: [PATCH 2/8] xhci: Prevent device initiated U1/U2 link pm if exit latency is too long
Date: Fri,  4 Oct 2019 14:59:27 +0300
Message-ID: <1570190373-30684-3-git-send-email-mathias.nyman@linux.intel.com> (raw)
In-Reply-To: <1570190373-30684-1-git-send-email-mathias.nyman@linux.intel.com>

If host/hub initiated link pm is prevented by a driver flag we still must
ensure that periodic endpoints have longer service intervals than link pm
exit latency before allowing device initiated link pm.

Fix this by continue walking and checking endpoint service interval if
xhci_get_timeout_no_hub_lpm() returns anything else than USB3_LPM_DISABLED

While at it fix the split line error message

Tested-by: Jan Schmidt <jan@centricular.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
---
 drivers/usb/host/xhci.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 500865975687..aed5a65f25bd 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -4790,10 +4790,12 @@ static u16 xhci_calculate_lpm_timeout(struct usb_hcd *hcd,
 		if (intf->dev.driver) {
 			driver = to_usb_driver(intf->dev.driver);
 			if (driver && driver->disable_hub_initiated_lpm) {
-				dev_dbg(&udev->dev, "Hub-initiated %s disabled "
-						"at request of driver %s\n",
-						state_name, driver->name);
-				return xhci_get_timeout_no_hub_lpm(udev, state);
+				dev_dbg(&udev->dev, "Hub-initiated %s disabled at request of driver %s\n",
+					state_name, driver->name);
+				timeout = xhci_get_timeout_no_hub_lpm(udev,
+								      state);
+				if (timeout == USB3_LPM_DISABLED)
+					return timeout;
 			}
 		}
 
-- 
2.7.4


  parent reply index

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-04 11:59 [PATCH 0/8] xhci fixes for usb-linus Mathias Nyman
2019-10-04 11:59 ` [PATCH 1/8] xhci: Fix false warning message about wrong bounce buffer write length Mathias Nyman
2019-10-04 11:59 ` Mathias Nyman [this message]
2019-10-04 11:59 ` [PATCH 3/8] xhci: Check all endpoints for LPM timeout Mathias Nyman
2019-10-04 11:59 ` [PATCH 4/8] xhci: Fix USB 3.1 capability detection on early xHCI 1.1 spec based hosts Mathias Nyman
2019-10-04 11:59 ` [PATCH 5/8] usb: xhci: wait for CNR controller not ready bit in xhci resume Mathias Nyman
2019-10-04 11:59 ` [PATCH 6/8] xhci: Prevent deadlock when xhci adapter breaks during init Mathias Nyman
2019-10-04 11:59 ` [PATCH 7/8] xhci: Increase STS_SAVE timeout in xhci_suspend() Mathias Nyman
     [not found]   ` <20191006120750.5334F2087E@mail.kernel.org>
2019-10-07 18:51     ` Kai-Heng Feng
2019-10-04 11:59 ` [PATCH 8/8] xhci: Fix NULL pointer dereference in xhci_clear_tt_buffer_complete() Mathias Nyman
2019-10-07 14:02   ` Johan Hovold
2019-10-08  8:15     ` Mathias Nyman
2019-10-11 12:47       ` Mathias Nyman
2019-10-11 12:58         ` [RFT PATCH] xhci: Fix use-after-free regression in xhci clear hub TT implementation Mathias Nyman
2019-10-14 10:16           ` Johan Hovold
2019-10-14 13:18             ` Mathias Nyman

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