From 12a19b5f836c1a1b838e668f9aa804d017d8c58b Mon Sep 17 00:00:00 2001 From: NeilBrown Date: Mon, 13 Aug 2012 12:32:58 +1000 Subject: [PATCH] usb: musb: omap2430: don't loop indefinitely in interrupt. When called during resume_irqs, omap2430_musb_set_vbus() is run with interrupts disabled, In that case 'jiffies' never changes so the loop can loop forever. So impose a maximum loop count and add an 'mdelay' to ensure we wait a reasonable amount of time for bit to be cleared. This fixes a hang on resume. Signed-of-by: NeilBrown Signed-off-by: Felipe Balbi --- drivers/usb/musb/omap2430.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c index e32aff9920f2..af5f4214673d 100644 --- a/drivers/usb/musb/omap2430.c +++ b/drivers/usb/musb/omap2430.c @@ -34,6 +34,7 @@ #include #include #include +#include #include #include "musb_core.h" @@ -150,6 +151,7 @@ static void omap2430_musb_set_vbus(struct musb *musb, int is_on) if (is_on) { if (musb->xceiv->state == OTG_STATE_A_IDLE) { + int loops = 100; /* start the session */ devctl |= MUSB_DEVCTL_SESSION; musb_writeb(musb->mregs, MUSB_DEVCTL, devctl); @@ -159,9 +161,11 @@ static void omap2430_musb_set_vbus(struct musb *musb, int is_on) */ while (musb_readb(musb->mregs, MUSB_DEVCTL) & 0x80) { + mdelay(5); cpu_relax(); - if (time_after(jiffies, timeout)) { + if (time_after(jiffies, timeout) + || loops-- <= 0) { dev_err(musb->controller, "configured as A device timeout"); ret = -EINVAL; -- 2.39.2