This is a note to let you know that I've just added the patch titled

iio: adc: ad7606: check for NULL before calling sw_mode_config()

to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 5257d80e22bf27009d6742e4c174f42cfe54e425 Mon Sep 17 00:00:00 2001 From: David Lechner dlechner@baylibre.com Date: Tue, 18 Mar 2025 17:52:09 -0500 Subject: iio: adc: ad7606: check for NULL before calling sw_mode_config() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit

Check that the sw_mode_config function pointer is not NULL before calling it. Not all buses define this callback, which resulted in a NULL pointer dereference.

Fixes: e571c1902116 ("iio: adc: ad7606: move scale_setup as function pointer on chip-info") Reviewed-by: Nuno Sá nuno.sa@analog.com Signed-off-by: David Lechner dlechner@baylibre.com Link: https://patch.msgid.link/20250318-iio-adc-ad7606-improvements-v2-1-4b6054277... Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com --- drivers/iio/adc/ad7606.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c index 1a314fddd7eb..703556eb7257 100644 --- a/drivers/iio/adc/ad7606.c +++ b/drivers/iio/adc/ad7606.c @@ -1236,9 +1236,11 @@ static int ad7616_sw_mode_setup(struct iio_dev *indio_dev) st->write_scale = ad7616_write_scale_sw; st->write_os = &ad7616_write_os_sw;

- ret = st->bops->sw_mode_config(indio_dev); - if (ret) - return ret; + if (st->bops->sw_mode_config) { + ret = st->bops->sw_mode_config(indio_dev); + if (ret) + return ret; + }

/* Activate Burst mode and SEQEN MODE */ return ad7606_write_mask(st, AD7616_CONFIGURATION_REGISTER, @@ -1268,6 +1270,9 @@ static int ad7606b_sw_mode_setup(struct iio_dev *indio_dev) st->write_scale = ad7606_write_scale_sw; st->write_os = &ad7606_write_os_sw;

+ if (!st->bops->sw_mode_config) + return 0; + return st->bops->sw_mode_config(indio_dev); }