linux-kernel - sleeping while atomic in dwc3_gadget

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Message-ID: <20130626215256.GC11625@codeaurora.org>
Date:	Wed, 26 Jun 2013 14:52:56 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Felipe Balbi <balbi@...com>
Cc:	Vivek Gautam <gautam.vivek@...sung.com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: sleeping while atomic in dwc3_gadget_start

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?
-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
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