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| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2020-11-19 13:46:10 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-09 19:33:55 +0100 |
| commit | 16085668eacdc56c46652d0f3bfef81ecace57de (patch) | |
| tree | 74aa629b2d3c9f27ca546da3774882371125c03f /drivers/base/platform.c | |
| parent | driver core: platform: reorder functions (diff) | |
| download | linux-16085668eacdc56c46652d0f3bfef81ecace57de.tar.xz linux-16085668eacdc56c46652d0f3bfef81ecace57de.zip | |
driver core: platform: change logic implementing platform_driver_probe
Instead of overwriting the core driver's probe function handle probing
devices for drivers loaded by platform_driver_probe() in the platform
driver probe function.
The intended goal is to not have to change the probe function to
simplify converting the platform bus to use bus functions.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Link: https://lore.kernel.org/r/20201119124611.2573057-2-u.kleine-koenig@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/base/platform.c')
| -rw-r--r-- | drivers/base/platform.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/drivers/base/platform.c b/drivers/base/platform.c index b36ab5831cb6..b847f5f8f992 100644 --- a/drivers/base/platform.c +++ b/drivers/base/platform.c @@ -743,12 +743,25 @@ err: } EXPORT_SYMBOL_GPL(platform_device_register_full); +static int platform_probe_fail(struct platform_device *pdev); + static int platform_drv_probe(struct device *_dev) { struct platform_driver *drv = to_platform_driver(_dev->driver); struct platform_device *dev = to_platform_device(_dev); int ret; + /* + * A driver registered using platform_driver_probe() cannot be bound + * again later because the probe function usually lives in __init code + * and so is gone. For these drivers .probe is set to + * platform_probe_fail in __platform_driver_probe(). Don't even + * prepare clocks and PM domains for these to match the traditional + * behaviour. + */ + if (unlikely(drv->probe == platform_probe_fail)) + return -ENXIO; + ret = of_clk_set_defaults(_dev->of_node, false); if (ret < 0) return ret; @@ -822,7 +835,7 @@ void platform_driver_unregister(struct platform_driver *drv) } EXPORT_SYMBOL_GPL(platform_driver_unregister); -static int platform_drv_probe_fail(struct device *_dev) +static int platform_probe_fail(struct platform_device *pdev) { return -ENXIO; } @@ -887,10 +900,9 @@ int __init_or_module __platform_driver_probe(struct platform_driver *drv, * new devices fail. */ spin_lock(&drv->driver.bus->p->klist_drivers.k_lock); - drv->probe = NULL; + drv->probe = platform_probe_fail; if (code == 0 && list_empty(&drv->driver.p->klist_devices.k_list)) retval = -ENODEV; - drv->driver.probe = platform_drv_probe_fail; spin_unlock(&drv->driver.bus->p->klist_drivers.k_lock); if (code != retval) |