[PATCH v4 1/3] media: mali-c55: add missing of_reserved_mem_device_release()

[David Carlier]

mali_c55_probe() calls of_reserved_mem_device_init() to associate
reserved memory regions with the device. This function allocates a
struct rmem_assigned_device and adds it to a global linked list, which
must be explicitly released via of_reserved_mem_device_release() — there
is no devm variant of this API.

However, neither the probe error paths nor mali_c55_remove() called
of_reserved_mem_device_release(). Any probe failure after the
of_reserved_mem_device_init() call, as well as every normal device
removal, leaked the reserved memory association on the global list.

Fix this by adding an err_release_mem label at the end of the probe
error chain and calling of_reserved_mem_device_release() in
mali_c55_remove(). The remove teardown order is also corrected to call
mali_c55_media_frameworks_deinit() before kfree(), mirroring the probe
init order in reverse.

Fixes: d5f281f3dd29 ("media: mali-c55: Add Mali-C55 ISP driver")
Signed-off-by: David Carlier <devnexen@xxxxxxxxx>
Reviewed-by: Jacopo Mondi <jacopo.mondi@xxxxxxxxxxxxxxxx>
---
 drivers/media/platform/arm/mali-c55/mali-c55-core.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/arm/mali-c55/mali-c55-core.c b/drivers/media/platform/arm/mali-c55/mali-c55-core.c
index c1a562cd214e..5cb59c70ffc9 100644
--- a/drivers/media/platform/arm/mali-c55/mali-c55-core.c
+++ b/drivers/media/platform/arm/mali-c55/mali-c55-core.c
@@ -806,8 +806,10 @@ static int mali_c55_probe(struct platform_device *pdev)
 	vb2_dma_contig_set_max_seg_size(dev, UINT_MAX);
 
 	ret = __mali_c55_power_on(mali_c55);
-	if (ret)
-		return dev_err_probe(dev, ret, "failed to power on\n");
+	if (ret) {
+		dev_err_probe(dev, ret, "failed to power on\n");
+		goto err_release_mem;
+	}
 
 	ret = mali_c55_check_hwcfg(mali_c55);
 	if (ret)
@@ -846,6 +848,8 @@ static int mali_c55_probe(struct platform_device *pdev)
 	kfree(mali_c55->context.registers);
 err_power_off:
 	__mali_c55_power_off(mali_c55);
+err_release_mem:
+	of_reserved_mem_device_release(dev);
 
 	return ret;
 }
@@ -854,8 +858,9 @@ static void mali_c55_remove(struct platform_device *pdev)
 {
 	struct mali_c55 *mali_c55 = platform_get_drvdata(pdev);
 
-	kfree(mali_c55->context.registers);
 	mali_c55_media_frameworks_deinit(mali_c55);
+	kfree(mali_c55->context.registers);
+	of_reserved_mem_device_release(&pdev->dev);
 }
 
 static const struct of_device_id mali_c55_of_match[] = {
-- 
2.53.0