USB: gadget: cdc-acm deadlock fix

[linux-2.6-omap-h63xx.git] / drivers / usb / gadget / f_acm.c

diff --git a/drivers/usb/gadget/f_acm.c b/drivers/usb/gadget/f_acm.c
index 5ee1590b8e9cf2739e629804193aa8fa053954cf..c1d34df0b157c45f533b03b794bd14a929055f70 100644 (file)
--- a/drivers/usb/gadget/f_acm.c
+++ b/drivers/usb/gadget/f_acm.c
@@ -463,7 +463,11 @@ static int acm_cdc_notify(struct f_acm *acm, u8 type, u16 value,
        notify->wLength = cpu_to_le16(length);
        memcpy(buf, data, length);
 
+       /* ep_queue() can complete immediately if it fills the fifo... */
+       spin_unlock(&acm->lock);
        status = usb_ep_queue(ep, req, GFP_ATOMIC);
+       spin_lock(&acm->lock);
+
        if (status < 0) {
                ERROR(acm->port.func.config->cdev,
                                "acm ttyGS%d can't notify serial state, %d\n",