summaryrefslogtreecommitdiff
path: root/drivers/usb
diff options
context:
space:
mode:
authorTony Lindgren <tony@atomide.com>2016-08-26 16:28:39 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-08-30 14:11:38 +0200
commit2c5575401e34de3d2fc90af1c95bc73435784093 (patch)
tree0354939074ae45d09c7c73a156bb1fb58cfc9356 /drivers/usb
parent3fa2a81e6e77f4308b4a3860aab2a1885a127f47 (diff)
usb: musb: Fix locking errors for host only mode
If we have USB gadgets disabled and USB_MUSB_HOST set, we get errors "possible irq lock inverssion dependency detected" errors during boot. Let's fix the issue by adding start_musb flag and start the controller after we're out of the spinlock protected section. Reported-by: Ladislav Michl <ladis@linux-mips.org> Tested-by: Ladislav Michl <ladis@linux-mips.org> Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Bin Liu <b-liu@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/musb/musb_virthub.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/usb/musb/musb_virthub.c b/drivers/usb/musb/musb_virthub.c
index 192248f974ec..fe08e776fec3 100644
--- a/drivers/usb/musb/musb_virthub.c
+++ b/drivers/usb/musb/musb_virthub.c
@@ -290,6 +290,7 @@ int musb_hub_control(
u32 temp;
int retval = 0;
unsigned long flags;
+ bool start_musb = false;
spin_lock_irqsave(&musb->lock, flags);
@@ -390,7 +391,7 @@ int musb_hub_control(
* logic relating to VBUS power-up.
*/
if (!hcd->self.is_b_host && musb_has_gadget(musb))
- musb_start(musb);
+ start_musb = true;
break;
case USB_PORT_FEAT_RESET:
musb_port_reset(musb, true);
@@ -451,5 +452,9 @@ error:
retval = -EPIPE;
}
spin_unlock_irqrestore(&musb->lock, flags);
+
+ if (start_musb)
+ musb_start(musb);
+
return retval;
}