On Tue, 2021-03-23 at 07:19 -0700, Joe Perches wrote:
> 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));
+1
The second one looks better as it's more informative.
Regards,
Liu Ying
>
> > @@ -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...
>
>
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