| Message ID | 20211004192741.621870-2-marijn.suijten@somainline.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | backlight: qcom-wled: fix and solidify handling of enabled-strings | expand |
On Mon, Oct 04, 2021 at 09:27:32PM +0200, Marijn Suijten wrote: > of_property_read_u32_array takes the number of elements to read as last > argument. This does not always need to be 4 (sizeof(u32)) but should > instead be the size of the array in DT as read just above with > of_property_count_elems_of_size. > > To not make such an error go unnoticed again the driver now bails > accordingly when of_property_read_u32_array returns an error. > > Fixes: 775d2ffb4af6 ("backlight: qcom-wled: Restructure the driver for WLED3") > Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org> > Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org> Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org> > --- > drivers/video/backlight/qcom-wled.c | 13 ++++++++++--- > 1 file changed, 10 insertions(+), 3 deletions(-) > > diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c > index d094299c2a48..6af808af2328 100644 > --- a/drivers/video/backlight/qcom-wled.c > +++ b/drivers/video/backlight/qcom-wled.c > @@ -1528,11 +1528,18 @@ static int wled_configure(struct wled *wled) > string_len = of_property_count_elems_of_size(dev->of_node, > "qcom,enabled-strings", > sizeof(u32)); > - if (string_len > 0) > - of_property_read_u32_array(dev->of_node, > + if (string_len > 0) { > + rc = of_property_read_u32_array(dev->of_node, > "qcom,enabled-strings", > wled->cfg.enabled_strings, > - sizeof(u32)); > + string_len); > + if (rc) { > + dev_err(dev, "Failed to read %d elements from " > + "qcom,enabled-strings: %d\n", > + string_len, rc); > + return -EINVAL; > + } > + } > > return 0; > } > -- > 2.33.0 >
diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c index d094299c2a48..6af808af2328 100644 --- a/drivers/video/backlight/qcom-wled.c +++ b/drivers/video/backlight/qcom-wled.c @@ -1528,11 +1528,18 @@ static int wled_configure(struct wled *wled) string_len = of_property_count_elems_of_size(dev->of_node, "qcom,enabled-strings", sizeof(u32)); - if (string_len > 0) - of_property_read_u32_array(dev->of_node, + if (string_len > 0) { + rc = of_property_read_u32_array(dev->of_node, "qcom,enabled-strings", wled->cfg.enabled_strings, - sizeof(u32)); + string_len); + if (rc) { + dev_err(dev, "Failed to read %d elements from " + "qcom,enabled-strings: %d\n", + string_len, rc); + return -EINVAL; + } + } return 0; }
of_property_read_u32_array takes the number of elements to read as last argument. This does not always need to be 4 (sizeof(u32)) but should instead be the size of the array in DT as read just above with of_property_count_elems_of_size. To not make such an error go unnoticed again the driver now bails accordingly when of_property_read_u32_array returns an error. Fixes: 775d2ffb4af6 ("backlight: qcom-wled: Restructure the driver for WLED3") Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org> --- drivers/video/backlight/qcom-wled.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-)