USB: musb: minor locking fix

Minor locking fix for musb_hdrc on OMAP3 and OMAP2430:
don't read DEVCTL without holding the spinlock, since
an IRQ could come in and corrupt things.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
index 52988a403b5c..901dffdf23b1 100644
--- a/drivers/usb/musb/omap2430.c
+++ b/drivers/usb/musb/omap2430.c
@@ -58,10 +58,10 @@ static void musb_do_idle(unsigned long _musb)
 #endif
         u8      devctl;
 
-        devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
-
         spin_lock_irqsave(&musb->lock, flags);
 
+        devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
+
         switch (musb->xceiv.state) {
         case OTG_STATE_A_WAIT_BCON:
                 devctl &= ~MUSB_DEVCTL_SESSION;