linux-kernel - RE: [PATCH] usb: f_fs: avoid race condition with ffs_epfile_io

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Date:	Tue, 5 Jan 2016 06:22:02 +0000
From:	"Du, Changbin" <changbin.du@...el.com>
To:	Peter Chen <hzpeterchen@...il.com>
CC:	"balbi@...com" <balbi@...com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
	"mina86@...a86.com" <mina86@...a86.com>,
	"r.baldyga@...sung.com" <r.baldyga@...sung.com>,
	"rui.silva@...aro.org" <rui.silva@...aro.org>,
	"k.opasiak@...sung.com" <k.opasiak@...sung.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] usb: f_fs: avoid race condition with
 ffs_epfile_io_complete

> >
> > You are right, but the problem is the request->status is wrong. If the data
> > send out but report caller as -EINTR, it will introduce duplicate-send
> > issue.
> >
> 
> Why -EINTR, the kernel-doc said it should return -ECONNRESET for active
> request, see include/linux/usb/gadget.h.
> 
> --
> 
> Best Regards,
> Peter Chen
F_fs return -EINTER in its dequeuer case, not udc driver. What I want
to say is driver should return the right status for each usb request.

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