* [PATCH] xen-fbfront: correct return value checks on xenbus_scanf()
@ 2016-07-07 7:48 Jan Beulich
2016-07-07 9:46 ` [Xen-devel] " David Vrabel
0 siblings, 1 reply; 2+ messages in thread
From: Jan Beulich @ 2016-07-07 7:48 UTC (permalink / raw)
To: plagnioj, tomi.valkeinen
Cc: Juergen Gross, xen-devel, Boris Ostrovsky, David Vrabel,
linux-fbdev
Only a positive return value indicates success.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
---
drivers/video/fbdev/xen-fbfront.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- 4.7-rc6-xenbus_scanf.orig/drivers/video/fbdev/xen-fbfront.c
+++ 4.7-rc6-xenbus_scanf/drivers/video/fbdev/xen-fbfront.c
@@ -658,13 +658,13 @@ InitWait:
goto InitWait; /* no InitWait seen yet, fudge it */
if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
- "request-update", "%d", &val) < 0)
+ "request-update", "%d", &val) <= 0)
val = 0;
if (val)
info->update_wanted = 1;
if (xenbus_scanf(XBT_NIL, dev->otherend,
- "feature-resize", "%d", &val) < 0)
+ "feature-resize", "%d", &val) <= 0)
val = 0;
info->feature_resize = val;
break;
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [Xen-devel] [PATCH] xen-fbfront: correct return value checks on xenbus_scanf()
2016-07-07 7:48 [PATCH] xen-fbfront: correct return value checks on xenbus_scanf() Jan Beulich
@ 2016-07-07 9:46 ` David Vrabel
0 siblings, 0 replies; 2+ messages in thread
From: David Vrabel @ 2016-07-07 9:46 UTC (permalink / raw)
To: Jan Beulich, plagnioj, tomi.valkeinen
Cc: Juergen Gross, xen-devel, Boris Ostrovsky, David Vrabel,
linux-fbdev
On 07/07/16 08:48, Jan Beulich wrote:
>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
> ---
> drivers/video/fbdev/xen-fbfront.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> --- 4.7-rc6-xenbus_scanf.orig/drivers/video/fbdev/xen-fbfront.c
> +++ 4.7-rc6-xenbus_scanf/drivers/video/fbdev/xen-fbfront.c
> @@ -658,13 +658,13 @@ InitWait:
> goto InitWait; /* no InitWait seen yet, fudge it */
>
> if (xenbus_scanf(XBT_NIL, info->xbdev->otherend,
> - "request-update", "%d", &val) < 0)
> + "request-update", "%d", &val) <= 0)
> val = 0;
> if (val)
> info->update_wanted = 1;
>
> if (xenbus_scanf(XBT_NIL, dev->otherend,
> - "feature-resize", "%d", &val) < 0)
> + "feature-resize", "%d", &val) <= 0)
xenbus_scanf() has:
/* Single read and scanf: returns -errno or num scanned. */
...
if (ret = 0)
return -ERANGE;
...
So none of these patches are necessary.
David
^ permalink raw reply [flat|nested] 2+ messages in thread
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2016-07-07 9:46 ` [Xen-devel] " David Vrabel
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