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

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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 <[email protected]>.

Signed-off-by: Marcin Slusarz <[email protected]>
Cc: David Brownell <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Marcin Slusarz 2008-05-12 20:17:25 +02:00 • committed by Greg Kroah-Hartman
commit 6def755320
1 changed files with 5 additions and 0 deletions
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5
drivers/usb/misc/usbtest.c
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@ -856,6 +856,11 @@ test_ctrl_queue (struct usbtest_dev *dev, struct usbtest_param *param)
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