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Subjectpatch usbtest-comment-on-why-this-code-expects-negative-and-positive-errnos.patch added to gregkh-2.6 tree
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This is a note to let you know that I've just added the patch titled

Subject: usbtest: comment on why this code "expects" negative and positive errnos

to my gregkh-2.6 tree. Its filename is

usbtest-comment-on-why-this-code-expects-negative-and-positive-errnos.patch

This tree can be found at
http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/patches/


From marcin.slusarz@gmail.com Tue May 13 14:58:09 2008
From: Marcin Slusarz <marcin.slusarz@gmail.com>
Date: Mon, 12 May 2008 20:17:25 +0200
Subject: usbtest: comment on why this code "expects" negative and positive errnos
To: David Brownell <david-b@pacbell.net>, LKML <linux-kernel@vger.kernel.org>
Cc: Greg Kroah-Hartman <gregkh@suse.de>, linux-usb@vger.kernel.org
Message-ID: <20080512181721.GA6031@joi>
Content-Disposition: inline


On Mon, May 12, 2008 at 01:02:22AM -0700, David Brownell wrote:
> On Sunday 11 May 2008, Marcin Slusarz wrote:
> >
> > test_ctrl_queue expects (?) positive and negative errnos.
> > what is going on here?
>
> The sign is just a way to flag something:
>
> /* some faults are allowed, not required */
>
> The negative ones are required. Positive codes are optional,
> in the sense that, depending on how the peripheral happens
> to be implemented, they won't necessarily be triggered.
>
> For example, the test to fetch a device qualifier desriptor
> must succeed if the device is running at high speed. So that
> test is marked as negative. But when it's full speed, it
> could legitimately fail; marked as positive. And so on for
> other tests.
>
> Look at how the codes are *interpreted* to see it work.

Lets document it.

Based on comment from David Brownell <david-b@pacbell.net>.

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/usb/misc/usbtest.c | 5 +++++
1 file changed, 5 insertions(+)

--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -856,6 +856,11 @@ test_ctrl_queue (struct usbtest_dev *dev
struct urb *u;
struct usb_ctrlrequest req;
struct subcase *reqp;
+
+ /* sign of this variable means:
+ * -: tested code must return this (negative) error code
+ * +: tested code may return this (negative too) error code
+ */
int expected = 0;

/* requests here are mostly expected to succeed on any

Patches currently in gregkh-2.6 which might be from marcin.slusarz@gmail.com are

usb.current/usbtest-comment-on-why-this-code-expects-negative-and-positive-errnos.patch


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