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platform: Add platform_find_device_by_driver() helper

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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: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20190723221838.12024-8-suzuki.poulose@arm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose
2019-07-23 23:18:38 +01:00
committed by Greg Kroah-Hartman
parent 6bf85ba9e5
commit 36f3313d6b
6 changed files with 23 additions and 12 deletions
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9
drivers/gpu/drm/exynos/exynos_drm_drv.c
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@@ -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));
}