Commit 36f3313d authored by Suzuki K Poulose's avatar Suzuki K Poulose Committed by Greg Kroah-Hartman
Browse files

platform: Add platform_find_device_by_driver() helper 



Provide a helper to lookup platform devices by matching device
driver in order to avoid drivers trying to use platform bus
internals.

Cc: Eric Anholt <eric@anholt.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Heiko Stübner" <heiko@sntech.de>
Cc: Inki Dae <inki.dae@samsung.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Sandy Huang <hjc@rock-chips.com>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Tested-by: default avatarHeiko Stuebner <heiko@sntech.de>
Signed-off-by: default avatarSuzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20190723221838.12024-8-suzuki.poulose@arm.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6bf85ba9

drivers/base/platform.c

+14 −0
Original line number Diff line number Diff line
@@ -1197,6 +1197,20 @@ struct bus_type platform_bus_type = { 
};

EXPORT_SYMBOL_GPL(platform_bus_type);



/**

 * platform_find_device_by_driver - Find a platform device with a given

 * driver.

 * @start: The device to start the search from.

 * @drv: The device driver to look for.

 */

struct device *platform_find_device_by_driver(struct device *start,

					      const struct device_driver *drv)

{

	return bus_find_device(&platform_bus_type, start, drv,

			       (void *)platform_match);

}

EXPORT_SYMBOL_GPL(platform_find_device_by_driver);



int __init platform_bus_init(void)

{

	int error;

drivers/gpu/drm/exynos/exynos_drm_drv.c

+3 −6
Original line number Diff line number Diff line
@@ -242,9 +242,7 @@ static struct component_match *exynos_drm_match_add(struct device *dev) 
		if (!info->driver || !(info->flags & DRM_COMPONENT_DRIVER))

			continue;



		while ((d = bus_find_device(&platform_bus_type, p,

					    &info->driver->driver,

					    (void *)platform_bus_type.match))) {

		while ((d = platform_find_device_by_driver(p, &info->driver->driver))) {

			put_device(p);



			if (!(info->flags & DRM_FIMC_DEVICE) ||
@@ -412,9 +410,8 @@ static void exynos_drm_unregister_devices(void) 
		if (!info->driver || !(info->flags & DRM_VIRTUAL_DEVICE))

			continue;



		while ((dev = bus_find_device(&platform_bus_type, NULL,

					    &info->driver->driver,

					    (void *)platform_bus_type.match))) {

		while ((dev = platform_find_device_by_driver(NULL,

						&info->driver->driver))) {

			put_device(dev);

			platform_device_unregister(to_platform_device(dev));

		}

drivers/gpu/drm/mcde/mcde_drv.c

+1 −2
Original line number Diff line number Diff line
@@ -477,8 +477,7 @@ static int mcde_probe(struct platform_device *pdev) 
		struct device_driver *drv = &mcde_component_drivers[i]->driver;

		struct device *p = NULL, *d;



		while ((d = bus_find_device(&platform_bus_type, p, drv,

					    (void *)platform_bus_type.match))) {

		while ((d = platform_find_device_by_driver(p, drv))) {

			put_device(p);

			component_match_add(dev, &match, mcde_compare_dev, d);

			p = d;

drivers/gpu/drm/rockchip/rockchip_drm_drv.c

+1 −2
Original line number Diff line number Diff line
@@ -330,8 +330,7 @@ static struct component_match *rockchip_drm_match_add(struct device *dev) 
		struct device *p = NULL, *d;



		do {

			d = bus_find_device(&platform_bus_type, p, &drv->driver,

					    (void *)platform_bus_type.match);

			d = platform_find_device_by_driver(p, &drv->driver);

			put_device(p);

			p = d;

drivers/gpu/drm/vc4/vc4_drv.c

+1 −2
Original line number Diff line number Diff line
@@ -237,8 +237,7 @@ static void vc4_match_add_drivers(struct device *dev, 
		struct device_driver *drv = &drivers[i]->driver;

		struct device *p = NULL, *d;



		while ((d = bus_find_device(&platform_bus_type, p, drv,

					    (void *)platform_bus_type.match))) {

		while ((d = platform_find_device_by_driver(p, drv))) {

			put_device(p);

			component_match_add(dev, match, compare_dev, d);

			p = d;

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