On Tue, 2021-03-23 at 14:05 +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@xxxxxxxx>
>
> When CONFIG_OF is disabled, building with 'make W=1' produces warnings
> about out of bounds array access:
>
> drivers/gpu/drm/imx/imx-ldb.c: In function 'imx_ldb_set_clock.constprop':
> drivers/gpu/drm/imx/imx-ldb.c:186:8: error: array subscript -22 is below array bounds of 'struct clk *[4]' [-Werror=array-bounds]
>
> Add an error check before the index is used, which helps with the
> warning, as well as any possible other error condition that may be
> triggered at runtime.
[]
> diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
[]
> @@ -197,6 +197,12 @@ static void imx_ldb_encoder_enable(struct drm_encoder *encoder)
> int dual = ldb->ldb_ctrl & LDB_SPLIT_MODE_EN;
> int mux = drm_of_encoder_active_port_id(imx_ldb_ch->child, encoder);
>
> + if (mux < 0) {
> + dev_warn(ldb->dev,
> + "%s: invalid mux\n", __func__);
trivia:
Any real reason to make this 2 lines? It fits nicely in 80 chars. Maybe:
dev_warn(ldb->dev, "%s: invalid mux: %d\n", __func__, mux);
or maybe:
dev_warn(ldb->dev, "%s: invalid mux: %pe\n",
__func__, ERR_PTR(mux));
> @@ -255,6 +261,12 @@ imx_ldb_encoder_atomic_mode_set(struct drm_encoder *encoder,
[]
> + if (mux < 0) {
> + dev_warn(ldb->dev,
> + "%s: invalid mux\n", __func__);
etc...
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/dri-devel
