From: Kevin Hilman Date: Wed, 23 Nov 2011 01:18:24 +0000 (-0800) Subject: usb: musb: PM: fix context save/restore in suspend/resume path X-Git-Tag: v3.1.5~51 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b5e0fb085f337c2ab00532d09056da3525f2e847;p=thirdparty%2Fkernel%2Fstable.git usb: musb: PM: fix context save/restore in suspend/resume path commit 5d193ce8f1fa7c67c7fd7be2c03ef31eed344a4f upstream. Currently the driver tries to save context in the suspend path, but will cause an abort if the device is already runtime suspended. This happens, for example, if MUSB loaded/compiled-in, in host mode, but no USB devices are attached. MUSB will be runtime suspended, but then attempting a system suspend will crash due to the context save being attempted while the device is disabled. On OMAP, as of v3.1, the driver's ->runtime_suspend() callback will be called late in the suspend path (by the PM domain layer) if the driver is not already runtime suspended, ensuring a full shutdown. Therefore, the context save is not needed in the ->suspend() method since it will be called in the ->runtime_suspend() method anyways (similarily for resume.) NOTE: this leaves the suspend/resume methods basically empty (with some FIXMEs and comments, but I'll leave it to the maintainers to decide whether to remove them. Signed-off-by: Kevin Hilman Signed-off-by: Felipe Balbi Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index 20a28731c338e..a057a5a987b71 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -2302,18 +2302,12 @@ static int musb_suspend(struct device *dev) */ } - musb_save_context(musb); - spin_unlock_irqrestore(&musb->lock, flags); return 0; } static int musb_resume_noirq(struct device *dev) { - struct musb *musb = dev_to_musb(dev); - - musb_restore_context(musb); - /* for static cmos like DaVinci, register values were preserved * unless for some reason the whole soc powered down or the USB * module got reset through the PSC (vs just being disabled).