From: Dan Carpenter <dan.carpenter@oracle.com>
To: Oleksandr Andrushchenko <Oleksandr_Andrushchenko@epam.com>
Cc: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
"kernel-janitors@vger.kernel.org"
<kernel-janitors@vger.kernel.org>,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>
Subject: Re: [bug report] drm/xen-front: Add support for Xen PV display frontend
Date: Tue, 21 Apr 2020 14:51:12 +0300 [thread overview]
Message-ID: <20200421115112.GB2682@kadam> (raw)
In-Reply-To: <28cc7f7c-fe0a-fd06-d330-73531b818a79@epam.com>
It turns out there aren't that many of these in xen.
$ grep IS_ERR_OR_NULL drivers/gpu/drm/xen/ -Rn
drivers/gpu/drm/xen/xen_drm_front_kms.c:63: if (IS_ERR_OR_NULL(fb))
drivers/gpu/drm/xen/xen_drm_front_gem.c:86: if (IS_ERR_OR_NULL(xen_obj))
drivers/gpu/drm/xen/xen_drm_front_gem.c:120: if (IS_ERR_OR_NULL(xen_obj->pages)) {
drivers/gpu/drm/xen/xen_drm_front_gem.c:139: if (IS_ERR_OR_NULL(xen_obj))
drivers/gpu/drm/xen/xen_drm_front_gem.c:197: if (IS_ERR_OR_NULL(xen_obj))
drivers/gpu/drm/xen/xen_drm_front.c:403: if (IS_ERR_OR_NULL(obj)) {
They're all wrong, because if the pointer was really NULL then it's
not handled correctly and would eventually lead to a runtime failure.
Normally Smatch is smart enough to know that the pointer isn't NULL so
it doesn't generate a warning but yesterday I introduced a bug in Smatch
by mistake. It's fixed now.
regards,
dan carpenter
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2020-04-21 11:51 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-21 10:45 [bug report] drm/xen-front: Add support for Xen PV display frontend Dan Carpenter
2020-04-21 11:34 ` Oleksandr Andrushchenko
2020-04-21 11:51 ` Dan Carpenter [this message]
2020-04-21 12:54 ` Oleksandr Andrushchenko
2020-05-08 7:34 ` Oleksandr Andrushchenko
2020-04-21 15:29 ` Julia Lawall
2020-04-21 17:52 ` Dan Carpenter
2020-04-21 18:59 ` Julia Lawall
2020-04-21 19:33 ` Dan Carpenter
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200421115112.GB2682@kadam \
--to=dan.carpenter@oracle.com \
--cc=Oleksandr_Andrushchenko@epam.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=kernel-janitors@vger.kernel.org \
--cc=xen-devel@lists.xenproject.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox