patch "xhci: Fix sleeping with spin_lock_irq() held in ASmedia 1042A" added to usb-linus

This is a note to let you know that I've just added the patch titled

xhci: Fix sleeping with spin_lock_irq() held in ASmedia 1042A

to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From: Mathias Nyman <[email protected]>
Date: Mon, 18 Sep 2017 17:39:17 +0300
Subject: xhci: Fix sleeping with spin_lock_irq() held in ASmedia 1042A
workaround

The flow control workaround for ASM1042A xHC hosts sleeps between register polling. The workaround gets called in several places, among them with spin_lock_irq() held when xHC host is resumed or hoplug removed.

This was noticed as kernel panics at resume on a Dell XPS15 9550 with TB16 thunderbolt dock.

Avoid sleeping with spin_lock_irq() held, use udelay() instead

The original workaround was added to 4.9 and 4.12 stable releases, this patch needs to be applied to those as well.

---
 drivers/usb/host/pci-quirks.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index e02dbb1e1cdd..6dda3623a276 100644
@@ -447,7 +447,7 @@ static int usb_asmedia_wait_write(struct pci_dev *pdev)
 		if ((value & ASMT_CONTROL_WRITE_BIT) == 0)
 			return 0;
 
-		usleep_range(40, 60);
+		udelay(50);
 	}
 
 	dev_warn(&pdev->dev, "%s: check_write_ready timeout", __func__);

2.14.1