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Date: Thu, 8 Dec 2022 11:53:23 -0500 From: Frank Li <Frank.Li@....com> To: gregkh@...uxfoundation.org, Rondreis <linhaoguo86@...il.com> Cc: balbi@...nel.org, linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, stern@...land.harvard.edu, imx@...ts.linux.dev Subject: Re: [PATCH] usb: gadget: Assign a unique name for each configfs From: Frank Li <Frank.li@....com> On Wed, Sep 07, 2022 at 01:57:07PM +0200, Greg KH wrote: > On Wed, Sep 07, 2022 at 07:22:10PM +0800, Rondreis wrote: > > When fuzzing the kernel, I couldn't use configfs to attach more than one > > gadget. When attaching the second gadget with a different UDC it always > > failed and the kernel message said: > > > > Error: Driver 'configfs-gadget' is already registered, aborting... > > UDC core: g1: driver registration failed: -16 > > > > The problem is that when creating multiple gadgets with configfs and > > binding them to different UDCs, the UDC drivers have the same name > > "configfs-gadget". Because of the addition of the "gadget" bus, > > naming conflicts will occur when more than one UDC drivers > > registered to the bus. > > > > It's not an isolated case, this patch refers to the commit f2d8c2606825 > > ("usb: gadget: Fix non-unique driver names in raw-gadget driver"). > > Each configfs-gadget driver will be assigned a unique name > > "configfs-gadget.N", with a different value of N for each driver instance. > > Please wrap your changelog text at 72 columns like the documentation > asks for. > > > Reported-and-tested-by: Rondreis <linhaoguo86@...il.com> > > Signed-off-by: Rondreis <linhaoguo86@...il.com> > I met the same issue, do you plan continue this patch after fix greg's comments. If you have not time, I can continue it. Frank Li
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