[PATCH v3] staging: media: atomisp: Add lock asserts for various functions

[Abdelrahman Fekry <abdelrahmanfekry375@gmail.com>]

Add lockdep_assert_held(&isp->mutex) to critical functions accessing
shared device state. This enforces proper locking and detects violations.

Suggested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Abdelrahman Fekry <abdelrahmanfekry375@gmail.com>

---
v3:
- modify declarations to match kernel style

v2: https://lore.kernel.org/all/20250815182411.36092-1-abdelrahmanfekry375@gmail.com/
- Fix Typos
- tested by building the driver

v1: https://lore.kernel.org/all/20250815170901.32105-1-abdelrahmanfekry375@gmail.com/
 .../staging/media/atomisp/pci/atomisp_cmd.c   |  3 ++
 .../media/atomisp/pci/atomisp_compat_css20.c  | 28 +++++++++++++++++--
 2 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/media/atomisp/pci/atomisp_cmd.c b/drivers/staging/media/atomisp/pci/atomisp_cmd.c
index 3a4eb4f6d3be..fc5c8276b013 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_cmd.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_cmd.c
@@ -3706,6 +3706,7 @@ static int atomisp_set_sensor_crop_and_fmt(struct atomisp_device *isp,
 	struct v4l2_subdev_state *sd_state;
 	int ret = 0;
 
+	lockdep_assert_held(&isp->mutex);
 	if (!input->sensor)
 		return -EINVAL;
 
@@ -3800,6 +3801,7 @@ int atomisp_try_fmt(struct atomisp_device *isp, struct v4l2_pix_format *f,
 	u32 padding_w, padding_h;
 	int ret;
 
+	lockdep_assert_held(&isp->mutex);
 	fmt = atomisp_get_format_bridge(f->pixelformat);
 	/* Currently, raw formats are broken!!! */
 	if (!fmt || fmt->sh_fmt == IA_CSS_FRAME_FORMAT_RAW) {
@@ -4334,6 +4336,7 @@ int atomisp_set_fmt(struct video_device *vdev, struct v4l2_format *f)
 	struct v4l2_rect isp_sink_crop;
 	int ret;
 
+	lockdep_assert_held(&isp->mutex);
 	ret = atomisp_pipe_check(pipe, true);
 	if (ret)
 		return ret;
diff --git a/drivers/staging/media/atomisp/pci/atomisp_compat_css20.c b/drivers/staging/media/atomisp/pci/atomisp_compat_css20.c
index be5f37f4a6fd..03067479dd69 100644
--- a/drivers/staging/media/atomisp/pci/atomisp_compat_css20.c
+++ b/drivers/staging/media/atomisp/pci/atomisp_compat_css20.c
@@ -1447,9 +1447,11 @@ int atomisp_css_input_set_resolution(struct atomisp_sub_device *asd,
 				     enum atomisp_input_stream_id stream_id,
 				     struct v4l2_mbus_framefmt *ffmt)
 {
+	struct atomisp_device *isp = asd->isp;
 	struct ia_css_stream_config *s_config =
-		    &asd->stream_env[stream_id].stream_config;
+	&asd->stream_env[stream_id].stream_config;
 
+	lockdep_assert_held(&isp->mutex);
 	s_config->input_config.input_res.width = ffmt->width;
 	s_config->input_config.input_res.height = ffmt->height;
 	return 0;
@@ -1519,6 +1521,10 @@ int atomisp_css_set_default_isys_config(struct atomisp_sub_device *asd,
 					enum atomisp_input_stream_id stream_id,
 					struct v4l2_mbus_framefmt *ffmt)
 {
+	struct atomisp_device *isp = asd->isp;
+
+	lockdep_assert_held(&isp->mutex);
+
 	int i;
 	struct ia_css_stream_config *s_config =
 		    &asd->stream_env[stream_id].stream_config;
@@ -1621,6 +1627,9 @@ void atomisp_css_input_set_two_pixels_per_clock(
 
 void atomisp_css_enable_dz(struct atomisp_sub_device *asd, bool enable)
 {
+	struct atomisp_device *isp = asd->isp;
+
+	lockdep_assert_held(&isp->mutex);
 	int i;
 
 	for (i = 0; i < IA_CSS_PIPE_ID_NUM; i++)
@@ -1631,9 +1640,11 @@ void atomisp_css_enable_dz(struct atomisp_sub_device *asd, bool enable)
 void atomisp_css_capture_set_mode(struct atomisp_sub_device *asd,
 				  enum ia_css_capture_mode mode)
 {
+	struct atomisp_device *isp = asd->isp;
 	struct atomisp_stream_env *stream_env =
-		    &asd->stream_env[ATOMISP_INPUT_STREAM_GENERAL];
+	&asd->stream_env[ATOMISP_INPUT_STREAM_GENERAL];
 
+	lockdep_assert_held(&isp->mutex);
 	if (stream_env->pipe_configs[IA_CSS_PIPE_ID_CAPTURE]
 	    .default_capture_config.mode == mode)
 		return;
@@ -1646,6 +1657,9 @@ void atomisp_css_capture_set_mode(struct atomisp_sub_device *asd,
 void atomisp_css_input_set_mode(struct atomisp_sub_device *asd,
 				enum ia_css_input_mode mode)
 {
+	struct atomisp_device *isp = asd->isp;
+
+	lockdep_assert_held(&isp->mutex);
 	unsigned int size_mem_words;
 	int i;
 
@@ -1690,9 +1704,11 @@ void atomisp_css_input_set_mode(struct atomisp_sub_device *asd,
 void atomisp_css_capture_enable_online(struct atomisp_sub_device *asd,
 				       unsigned short stream_index, bool enable)
 {
+	struct atomisp_device *isp = asd->isp;
 	struct atomisp_stream_env *stream_env =
 		    &asd->stream_env[stream_index];
 
+	lockdep_assert_held(&isp->mutex);
 	if (stream_env->stream_config.online == !!enable)
 		return;
 
@@ -1726,6 +1742,9 @@ int atomisp_css_input_configure_port(
 {
 	int i;
 	struct atomisp_stream_env *stream_env;
+	struct atomisp_device *isp = asd->isp;
+
+	lockdep_assert_held(&isp->mutex);
 	/*
 	 * Calculate rx_count as follows:
 	 * Input: mipi_freq                 : CSI-2 bus frequency in Hz
@@ -1760,9 +1779,11 @@ int atomisp_css_input_configure_port(
 
 void atomisp_css_stop(struct atomisp_sub_device *asd, bool in_reset)
 {
+	struct atomisp_device *isp = asd->isp;
 	unsigned long irqflags;
 	unsigned int i;
 
+	lockdep_assert_held(&isp->mutex);
 	/*
 	 * CSS 2.0 API limitation: ia_css_stop_sp() can only be called after
 	 * destroying all pipes.
@@ -1815,6 +1836,9 @@ void atomisp_css_continuous_set_num_raw_frames(
      struct atomisp_sub_device *asd,
      int num_frames)
 {
+	struct atomisp_device *isp = asd->isp;
+
+	lockdep_assert_held(&isp->mutex);
 	if (asd->enable_raw_buffer_lock->val) {
 		asd->stream_env[ATOMISP_INPUT_STREAM_GENERAL]
 		.stream_config.init_num_cont_raw_buf =
-- 
2.25.1