Re: sleeping while atomic in dwc3_gadget_start

[Felipe Balbi]

On Wed, Jun 26, 2013 at 02:52:56PM -0700, Stephen Boyd wrote:
> Hi,
> 
> I'm getting the folllowing BUG message on bootup with 3.10-rc5
> 
> BUG: sleeping function called from invalid context at mm/slub.c:926
> in_atomic(): 1, irqs_disabled(): 128, pid: 1, name: swapper/0
> CPU: 0 PID: 1 Comm: swapper/0 Not tainted 3.10.0-rc5-gee3e35b-09316-ge78f3b35 
> #643
> [<c0014220>] (unwind_backtrace+0x0/0x120) from [<c001212c>] 
> (show_stack+0x10/0x14)
> [<c001212c>] (show_stack+0x10/0x14) from [<c0143750>] 
> (kmem_cache_alloc_trace+0x3c/0x210)
> [<c0143750>] (kmem_cache_alloc_trace+0x3c/0x210) from [<c00e0c60>] 
> (request_threaded_irq+0x88/0x11c)
> [<c00e0c60>] (request_threaded_irq+0x88/0x11c) from [<c03bf53c>] 
> (dwc3_gadget_start+0x198/0x200)
> [<c03bf53c>] (dwc3_gadget_start+0x198/0x200) from [<c03f7a5c>] 
> (udc_bind_to_driver+0x70/0xd8)
> [<c03f7a5c>] (udc_bind_to_driver+0x70/0xd8) from [<c03f7b50>] 
> (usb_gadget_probe_driver+0x8c/0xb8)
> 
> and I suspect this problem was introduced in commit 8698e2acf
> (usb: dwc3: gadget: introduce and use enable/disable irq
> methods). Is there a fix for this problem? Can we just move the
> irq request outside the spinlock?

nice :-)

how about this ?

diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index b5e5b35..a8e6b8b 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1508,6 +1508,15 @@ static int dwc3_gadget_start(struct usb_gadget *g,
        int                     irq;
        u32                     reg;
 
+       irq = platform_get_irq(to_platform_device(dwc->dev), 0);
+       ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
+                       IRQF_SHARED | IRQF_ONESHOT, "dwc3", dwc);
+       if (ret) {
+               dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
+                               irq, ret);
+               goto err0;
+       }
+
        spin_lock_irqsave(&dwc->lock, flags);
 
        if (dwc->gadget_driver) {
@@ -1515,7 +1524,7 @@ static int dwc3_gadget_start(struct usb_gadget *g,
                                dwc->gadget.name,
                                dwc->gadget_driver->driver.name);
                ret = -EBUSY;
-               goto err0;
+               goto err1;
        }
 
        dwc->gadget_driver      = driver;
@@ -1551,41 +1560,33 @@ static int dwc3_gadget_start(struct usb_gadget *g,
        ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
        if (ret) {
                dev_err(dwc->dev, "failed to enable %s\n", dep->name);
-               goto err0;
+               goto err1;
        }
 
        dep = dwc->eps[1];
        ret = __dwc3_gadget_ep_enable(dep, &dwc3_gadget_ep0_desc, NULL, false);
        if (ret) {
                dev_err(dwc->dev, "failed to enable %s\n", dep->name);
-               goto err1;
+               goto err2;
        }
 
        /* begin to receive SETUP packets */
        dwc->ep0state = EP0_SETUP_PHASE;
        dwc3_ep0_out_start(dwc);
 
-       irq = platform_get_irq(to_platform_device(dwc->dev), 0);
-       ret = request_threaded_irq(irq, dwc3_interrupt, dwc3_thread_interrupt,
-                       IRQF_SHARED | IRQF_ONESHOT, "dwc3", dwc);
-       if (ret) {
-               dev_err(dwc->dev, "failed to request irq #%d --> %d\n",
-                               irq, ret);
-               goto err1;
-       }
-
        dwc3_gadget_enable_irq(dwc);
 
        spin_unlock_irqrestore(&dwc->lock, flags);
 
        return 0;
 
-err1:
+err2:
        __dwc3_gadget_ep_disable(dwc->eps[0]);
 
-err0:
+err1:
        spin_unlock_irqrestore(&dwc->lock, flags);
 
+err0:
        return ret;
 }
 

-- 
balbi

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