Commit 9cb3542a authored by Dan Carpenter's avatar Dan Carpenter Committed by Laurentiu Palcu
Browse files

drm/imx/dcss: fix resource size calculation 



The resource is inclusive of the ->start and ->end addresses so this
calculation is not correct.  It should be "res->end - res->start + 1".
Use the resource_size() to do the calculation.

Fixes: 90393c9b ("drm/imx/dcss: request memory region")
Signed-off-by: default avatarDan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: default avatarLaurentiu Palcu <laurentiu.palcu@oss.nxp.com>
Signed-off-by: default avatarLaurentiu Palcu <laurentiu.palcu@oss.nxp.com>
Link: https://patchwork.freedesktop.org/patch/msgid/4914592b-4256-4c9c-bc1d-6dec1e473831@moroto.mountain
parent 9fa2679b

drivers/gpu/drm/imx/dcss/dcss-dev.c

+1 −3
Original line number Diff line number Diff line
@@ -167,7 +167,6 @@ struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output) 
	struct resource *res;

	struct dcss_dev *dcss;

	const struct dcss_type_data *devtype;

	resource_size_t res_len;



	devtype = of_device_get_match_data(dev);

	if (!devtype) {
@@ -181,8 +180,7 @@ struct dcss_dev *dcss_dev_create(struct device *dev, bool hdmi_output) 
		return ERR_PTR(-EINVAL);

	}



	res_len = res->end - res->start;

	if (!devm_request_mem_region(dev, res->start, res_len, "dcss")) {

	if (!devm_request_mem_region(dev, res->start, resource_size(res), "dcss")) {

		dev_err(dev, "cannot request memory region\n");

		return ERR_PTR(-EBUSY);

	}