Commit 4d4bd006 authored Jul 23, 2012 by Hemant Kumar Committed by Stephen Boyd Jul 08, 2013

usb: serial: Add a check for current autosuspend-delay expiration



Upon autosuspend-delay expiration for the device, runtime pm thread
initiates run time suspend after checking device's power.last_busy
time. There is a possibility of race condition between this check
and device interface driver updating power.last_busy time which
results in interface suspend in the middle of ongoing transfer
on that interface.

CRs-Fixed: 381765
Change-Id: I1fc4f8d9d9e83ef3ef6c564ee76294a703230fad
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>

parent 20b52dcb

drivers/usb/serial/usb_wwan.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -591,7 +591,7 @@ int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
		b = intfdata->in_flight;
		spin_unlock_irq(&intfdata->susp_lock);

		if (b)
		if (b \|\| pm_runtime_autosuspend_expiration(&serial->dev->dev))
		return -EBUSY;
		}