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

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Date:	Tue, 05 Jan 2016 13:45:06 +0100
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Peter Chen <hzpeterchen@...il.com>,
	"Du\, Changbin" <changbin.du@...el.com>
Cc:	"balbi\@ti.com" <balbi@...com>,
	"gregkh\@linuxfoundation.org" <gregkh@...uxfoundation.org>,
	"viro\@zeniv.linux.org.uk" <viro@...iv.linux.org.uk>,
	"r.baldyga\@samsung.com" <r.baldyga@...sung.com>,
	"rui.silva\@linaro.org" <rui.silva@...aro.org>,
	"k.opasiak\@samsung.com" <k.opasiak@...sung.com>,
	"linux-usb\@vger.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: f_fs: avoid race condition with ffs_epfile_io_complete

On Tue, Jan 05 2016, Peter Chen wrote:
> Why -EINTR, the kernel-doc said it should return -ECONNRESET for
> active request, see include/linux/usb/gadget.h.

Because EINTR is what read returns to the user if the operation has been
interrupted by a signal, see ‘man 2 read’:

       EINTR The call was interrupted by a signal before any data was
       read; see signal(7).


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