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| author | Kim Kyuwon <q1.kim@samsung.com> | 2009-03-26 18:56:51 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-04-17 10:50:26 -0700 |
| commit | 0ec8fd70fbd7327e1bf747c4a2f6b67efdf16618 (patch) | |
| tree | 5eff626ce5bd4b0975515fb12f69521910ea69d2 | |
| parent | 6b6e97107f12f3a9f7b5b43a6c3b94409240bcff (diff) | |
| download | blackbird-op-linux-0ec8fd70fbd7327e1bf747c4a2f6b67efdf16618.tar.gz blackbird-op-linux-0ec8fd70fbd7327e1bf747c4a2f6b67efdf16618.zip | |
USB: musb: fix possible panic while resuming
During driver resume processing, musb could cause a kernel panic.
Fix by enabling the clock earlier, with the resume_early method.
Signed-off-by: Kim Kyuwon <q1.kim@samsung.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/usb/musb/musb_core.c | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index 338cd1611ab3..0112353ec97d 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -2170,26 +2170,22 @@ static int musb_suspend(struct platform_device *pdev, pm_message_t message) return 0; } -static int musb_resume(struct platform_device *pdev) +static int musb_resume_early(struct platform_device *pdev) { - unsigned long flags; struct musb *musb = dev_to_musb(&pdev->dev); if (!musb->clock) return 0; - spin_lock_irqsave(&musb->lock, flags); - if (musb->set_clock) musb->set_clock(musb->clock, 1); else clk_enable(musb->clock); /* for static cmos like DaVinci, register values were preserved - * unless for some reason the whole soc powered down and we're - * not treating that as a whole-system restart (e.g. swsusp) + * unless for some reason the whole soc powered down or the USB + * module got reset through the PSC (vs just being disabled). */ - spin_unlock_irqrestore(&musb->lock, flags); return 0; } @@ -2207,7 +2203,7 @@ static struct platform_driver musb_driver = { .remove = __devexit_p(musb_remove), .shutdown = musb_shutdown, .suspend = musb_suspend, - .resume = musb_resume, + .resume_early = musb_resume_early, }; /*-------------------------------------------------------------------------*/ |
