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SubjectRe: drivers/gpu/drm/msm/dp/dp_hpd.c:37 dp_hpd_connect() error: we previously assumed 'hpd_priv->dp_cb' could be null (see line 37)
Hi Dan

Thanks for reporting this, will submit a change to fix this.

Abhinav

On 2021-02-28 23:02, Dan Carpenter wrote:
> tree:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> master
> head: fe07bfda2fb9cdef8a4d4008a409bb02f35f1bd8
> commit: c943b4948b5848fc0e07f875edbd35a973879e22 drm/msm/dp: add
> displayPort driver support
> config: arm64-randconfig-m031-20210301 (attached as .config)
> compiler: aarch64-linux-gcc (GCC) 9.3.0
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
>
> smatch warnings:
> drivers/gpu/drm/msm/dp/dp_hpd.c:37 dp_hpd_connect() error: we
> previously assumed 'hpd_priv->dp_cb' could be null (see line 37)
> drivers/gpu/drm/msm/dp/dp_power.c:203 dp_power_clk_enable() warn:
> inconsistent indenting
>
> vim +37 drivers/gpu/drm/msm/dp/dp_hpd.c
>
> c943b4948b5848 Chandan Uddaraju 2020-08-27 27 static int
> dp_hpd_connect(struct dp_usbpd *dp_usbpd, bool hpd)
> c943b4948b5848 Chandan Uddaraju 2020-08-27 28 {
> c943b4948b5848 Chandan Uddaraju 2020-08-27 29 int rc = 0;
> c943b4948b5848 Chandan Uddaraju 2020-08-27 30 struct dp_hpd_private
> *hpd_priv;
> c943b4948b5848 Chandan Uddaraju 2020-08-27 31
> c943b4948b5848 Chandan Uddaraju 2020-08-27 32 hpd_priv =
> container_of(dp_usbpd, struct dp_hpd_private,
> c943b4948b5848 Chandan Uddaraju 2020-08-27 33 dp_usbpd);
> c943b4948b5848 Chandan Uddaraju 2020-08-27 34
> c943b4948b5848 Chandan Uddaraju 2020-08-27 35 dp_usbpd->hpd_high =
> hpd;
> c943b4948b5848 Chandan Uddaraju 2020-08-27 36
> c943b4948b5848 Chandan Uddaraju 2020-08-27 @37 if (!hpd_priv->dp_cb
> && !hpd_priv->dp_cb->configure
>
> ^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^
> Probably || was intended instead of &&. If "hpd_priv->dp_cb" is NULL
> this will Oops.
>
> c943b4948b5848 Chandan Uddaraju 2020-08-27 38 &&
> !hpd_priv->dp_cb->disconnect) {
> c943b4948b5848 Chandan Uddaraju 2020-08-27 39 pr_err("hpd dp_cb
> not initialized\n");
> c943b4948b5848 Chandan Uddaraju 2020-08-27 40 return -EINVAL;
> c943b4948b5848 Chandan Uddaraju 2020-08-27 41 }
> c943b4948b5848 Chandan Uddaraju 2020-08-27 42 if (hpd)
> c943b4948b5848 Chandan Uddaraju 2020-08-27 43
> hpd_priv->dp_cb->configure(hpd_priv->dev);
> c943b4948b5848 Chandan Uddaraju 2020-08-27 44 else
> c943b4948b5848 Chandan Uddaraju 2020-08-27 45
> hpd_priv->dp_cb->disconnect(hpd_priv->dev);
> c943b4948b5848 Chandan Uddaraju 2020-08-27 46
> c943b4948b5848 Chandan Uddaraju 2020-08-27 47 return rc;
> c943b4948b5848 Chandan Uddaraju 2020-08-27 48 }
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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