[PATCH 0/2] iio: Make sure clk_init_data is fully initialized

[PATCH 0/2] iio: Make sure clk_init_data is fully initialized

[Geert Uytterhoeven]

	Hi all,

The clk_init_data structure contains several mutually-exclusive members
for different methods to specify the possible parents of a clock,
prompting drivers to initialize only the members they need.  However,
not initializing all members may cause subtle issues, which are only
exposed when CONFIG_INIT_STACK_ALL_PATTERN or CONFIG_INIT_STACK_NONE is
enabled.

Hence this series aims to make sure all members are fully initialized,
to avoid such bugs, and to prevent future breakage when converting
drivers to a different method for specifying the parents.

Part One[1] fixed all cases that I identified to be real bugs, in
response to a crash I saw on BeagleBone Black.

This series is the IIO subpart of Part Two, which fixes remaining cases
that are currently harmless.  These are still fragile, and may cause
future breakage when converting drivers to a different method for
specifying the parents.

Thanks for your comments!

[1] "[PATCH treewide 0/5] clk: Make sure clk_init_data is fully
     initialized (part 1)"
    https://lore.kernel.org/cover.1787165329.git.geert+renesas@glider.be

Geert Uytterhoeven (2):
  iio: adc: meson-saradc: Make sure clk_init_data is fully initialized
  iio: frequency: adf4350: Make sure clk_init_data is fully initialized

 drivers/iio/adc/meson_saradc.c  | 2 +-
 drivers/iio/frequency/adf4350.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

-- 
2.43.0

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds

[PATCH 1/2] iio: adc: meson-saradc: Make sure clk_init_data is fully initialized

[Geert Uytterhoeven]

The clk_init_data structure contains several mutually-exclusive members
for different methods to specify the possible parents of a clock,
prompting drivers to initialize only the members they need.  However,
not initializing all members may cause subtle issues, which are only
exposed when CONFIG_INIT_STACK_ALL_PATTERN or CONFIG_INIT_STACK_NONE is
enabled.

Make sure all members are fully initialized, to avoid such bugs, and to
prevent future breakage when converting drivers to a different method
for specifying the parents.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
Compile-tested only.
---
 drivers/iio/adc/meson_saradc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
index 000e39ca5c624eb6..7b89e2ecd0248b3a 100644
--- a/drivers/iio/adc/meson_saradc.c
+++ b/drivers/iio/adc/meson_saradc.c
@@ -739,7 +739,7 @@ static int meson_sar_adc_clk_init(struct iio_dev *indio_dev,
 {
 	struct meson_sar_adc_priv *priv = iio_priv(indio_dev);
 	struct device *dev = indio_dev->dev.parent;
-	struct clk_init_data init;
+	struct clk_init_data init = {};
 	const char *clk_parents[1];
 
 	init.name = devm_kasprintf(dev, GFP_KERNEL, "%s#adc_div", dev_name(dev));
-- 
2.43.0

[PATCH 2/2] iio: frequency: adf4350: Make sure clk_init_data is fully initialized

[Geert Uytterhoeven]

The clk_init_data structure contains several mutually-exclusive members
for different methods to specify the possible parents of a clock,
prompting drivers to initialize only the members they need.  However,
not initializing all members may cause subtle issues, which are only
exposed when CONFIG_INIT_STACK_ALL_PATTERN or CONFIG_INIT_STACK_NONE is
enabled.

Make sure all members are fully initialized, to avoid such bugs, and to
prevent future breakage when converting drivers to a different method
for specifying the parents.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
Compile-tested only.
---
 drivers/iio/frequency/adf4350.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/frequency/adf4350.c b/drivers/iio/frequency/adf4350.c
index 315317d6eec412f6..2e1f55d652cb14e6 100644
--- a/drivers/iio/frequency/adf4350.c
+++ b/drivers/iio/frequency/adf4350.c
@@ -461,7 +461,7 @@ static const struct clk_ops adf4350_clk_ops = {
 static int adf4350_clk_register(struct adf4350_state *st)
 {
 	struct spi_device *spi = st->spi;
-	struct clk_init_data init;
+	struct clk_init_data init = {};
 	struct clk *clk;
 	const char *parent_name;
 	int ret;
-- 
2.43.0

Re: [PATCH 1/2] iio: adc: meson-saradc: Make sure clk_init_data is fully initialized

[Joshua Crofts]

On Fri, 21 Aug 2026 12:04:06 +0200
Geert Uytterhoeven <geert+renesas@glider.be> wrote:

> The clk_init_data structure contains several mutually-exclusive members
> for different methods to specify the possible parents of a clock,
> prompting drivers to initialize only the members they need.  However,
> not initializing all members may cause subtle issues, which are only
> exposed when CONFIG_INIT_STACK_ALL_PATTERN or CONFIG_INIT_STACK_NONE is
> enabled.
> 
> Make sure all members are fully initialized, to avoid such bugs, and to
> prevent future breakage when converting drivers to a different method
> for specifying the parents.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> ---

Reviewed-by: Joshua Crofts <joshua.crofts1@gmail.com>

-- 
Kind regards,
Joshua Crofts