Hi, on the changes for platform_get_resource(), you can Acked-by: Thomas Zimmermann <tzimmermann@xxxxxxx> but see my comments below. Am 24.12.21 um 15:12 schrieb Kevin Tang:
platform_get_resource() may fail and return NULL, so check it's value before using it. 'drm' could be null in sprd_drm_shutdown, and drm_warn maybe dereference it, remove this warning log. Cc: Orson Zhai <orsonzhai@xxxxxxxxx> Cc: Chunyan Zhang <zhang.lyra@xxxxxxxxx> Signed-off-by: Kevin Tang <kevin.tang@xxxxxxxxxx> --- drivers/gpu/drm/sprd/sprd_dpu.c | 3 +++ drivers/gpu/drm/sprd/sprd_drm.c | 8 ++------ drivers/gpu/drm/sprd/sprd_dsi.c | 3 +++ 3 files changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/sprd/sprd_dpu.c b/drivers/gpu/drm/sprd/sprd_dpu.c index 06a3414ee..69683b7ba 100644 --- a/drivers/gpu/drm/sprd/sprd_dpu.c +++ b/drivers/gpu/drm/sprd/sprd_dpu.c @@ -790,6 +790,9 @@ static int sprd_dpu_context_init(struct sprd_dpu *dpu, int ret;res = platform_get_resource(pdev, IORESOURCE_MEM, 0);+ if (!res) + return -EINVAL; +
You can add an error message if this fails.
ctx->base = devm_ioremap(dev, res->start, resource_size(res)); if (!ctx->base) { dev_err(dev, "failed to map dpu registers\n"); diff --git a/drivers/gpu/drm/sprd/sprd_drm.c b/drivers/gpu/drm/sprd/sprd_drm.c index a077e2d4d..54030839e 100644 --- a/drivers/gpu/drm/sprd/sprd_drm.c +++ b/drivers/gpu/drm/sprd/sprd_drm.c @@ -154,12 +154,8 @@ static void sprd_drm_shutdown(struct platform_device *pdev) { struct drm_device *drm = platform_get_drvdata(pdev);- if (!drm) {- drm_warn(drm, "drm device is not available, no shutdown\n"); - return; - } - - drm_atomic_helper_shutdown(drm); + if (drm) + drm_atomic_helper_shutdown(drm);
This change should be in a separate patch. Instead of removing the warning, you should rather use dev_err() or dev_warn() from [1]. Not being able to shut down here looks like a serious driver bug that the user should know about.
}static const struct of_device_id drm_match_table[] = {diff --git a/drivers/gpu/drm/sprd/sprd_dsi.c b/drivers/gpu/drm/sprd/sprd_dsi.c index 911b3cddc..955c5995a 100644 --- a/drivers/gpu/drm/sprd/sprd_dsi.c +++ b/drivers/gpu/drm/sprd/sprd_dsi.c @@ -907,6 +907,9 @@ static int sprd_dsi_context_init(struct sprd_dsi *dsi, struct resource *res;res = platform_get_resource(pdev, IORESOURCE_MEM, 0);+ if (!res) + return -EINVAL; +
Again, an error message seems appropriate. Best regards Thomas[1] https://elixir.bootlin.com/linux/latest/source/include/linux/dev_printk.h#L145
ctx->base = devm_ioremap(dev, res->start, resource_size(res));
if (!ctx->base) {
drm_err(dsi->drm, "failed to map dsi host registers\n");
-- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Maxfeldstr. 5, 90409 Nürnberg, Germany (HRB 36809, AG Nürnberg) Geschäftsführer: Ivo Totev
Attachment:
OpenPGP_signature
Description: OpenPGP digital signature
