On Fri, Jan 12, 2018 at 3:55 PM, Lloyd Atkinson <latkinso@xxxxxxxxxxxxxx> wrote:
> Move null checks of pointer arguments to the beginning of the
> modeset init function since they are referenced immediately
> instead of after they have already been used.
>
> Signed-off-by: Lloyd Atkinson <latkinso@xxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/msm/dsi/dsi.c | 22 ++++++++++------------
> 1 file changed, 10 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dsi/dsi.c b/drivers/gpu/drm/msm/dsi/dsi.c
> index 98742d7..be855db 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi.c
> @@ -196,7 +196,7 @@ int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
> struct drm_bridge *ext_bridge;
> int ret;
>
> - if (WARN_ON(!encoder))
> + if (!encoder || !msm_dsi || !dev)
hmm, the checking if msm_dsi is null later in the fail: case is
certainly sketchy after we've already deref'd it.. so this looks like
the right thing. But I'd like to keep the WARN_ON(), since this is a
case that shouldn't really happen. The WARN_ON() nicely documents
that none of these parameters are expected to be NULL, and it gives a
big shouty message to anyone who inadvertently changes something that
breaks that assumption. Other than that, it looks good.
BR,
-R
> return -EINVAL;
>
> msm_dsi->dev = dev;
> @@ -245,19 +245,17 @@ int msm_dsi_modeset_init(struct msm_dsi *msm_dsi, struct drm_device *dev,
>
> return 0;
> fail:
> - if (msm_dsi) {
> - /* bridge/connector are normally destroyed by drm: */
> - if (msm_dsi->bridge) {
> - msm_dsi_manager_bridge_destroy(msm_dsi->bridge);
> - msm_dsi->bridge = NULL;
> - }
> + /* bridge/connector are normally destroyed by drm: */
> + if (msm_dsi->bridge) {
> + msm_dsi_manager_bridge_destroy(msm_dsi->bridge);
> + msm_dsi->bridge = NULL;
> + }
>
> - /* don't destroy connector if we didn't make it */
> - if (msm_dsi->connector && !msm_dsi->external_bridge)
> - msm_dsi->connector->funcs->destroy(msm_dsi->connector);
> + /* don't destroy connector if we didn't make it */
> + if (msm_dsi->connector && !msm_dsi->external_bridge)
> + msm_dsi->connector->funcs->destroy(msm_dsi->connector);
>
> - msm_dsi->connector = NULL;
> - }
> + msm_dsi->connector = NULL;
>
> return ret;
> }
> --
> QUALCOMM Canada, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
>
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