If a hard IRQ occurs during the soft IRQ TX processing, a recursive spinlock BUG can occur. Prevent this by interrupt-off locking around usb_hcd_link_urb_to_ep() Found while testing bluetooth A2DP audio over USB. Signed-off-by: Kevin Hilman <khilman@xxxxxxxxxx> --- drivers/usb/musb/musb_host.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c index 2ad2ed9..82e1265 100644 --- a/drivers/usb/musb/musb_host.c +++ b/drivers/usb/musb/musb_host.c @@ -1757,7 +1757,9 @@ static int musb_urb_enqueue( if (!is_host_active(musb) || !musb->is_active) return -ENODEV; + spin_lock_irqsave(&musb->lock, flags); ret = usb_hcd_link_urb_to_ep(hcd, urb); + spin_unlock_irqrestore(&musb->lock, flags); if (ret) return ret; -- 1.5.4.1.9.g9c55 - To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
