Merge "async: Add cmdline option to specify drivers to be async probed" (3abf4afd) · Commits · e / devices / android_kernel_xiaomi_nabu

Documentation/admin-guide/kernel-parameters.txt

+4 −0

Original line number	Diff line number	Diff line
		@@ -863,6 +863,10 @@
		The filter can be disabled or changed to another
		driver later using sysfs.

		driver_async_probe= [KNL]
		List of driver names to be probed asynchronously.
		Format: <driver_name1>,<driver_name2>...

		drm_kms_helper.edid_firmware=[<connector>:]<file>[,[<connector>:]<file>]
		Broken monitors, graphic adapters, KVMs and EDIDless
		panels may send no or incorrect EDID data sets.

+24 −0

Original line number	Diff line number	Diff line
		@@ -56,6 +56,10 @@ static LIST_HEAD(deferred_probe_active_list);
		static atomic_t deferred_trigger_count = ATOMIC_INIT(0);
		static bool initcalls_done;

		/* Save the async probe drivers' name from kernel cmdline */
		#define ASYNC_DRV_NAMES_MAX_LEN 256
		static char async_probe_drv_names[ASYNC_DRV_NAMES_MAX_LEN];

		/*
		* In some cases, like suspend to RAM or hibernation, It might be reasonable
		* to prohibit probing of devices as it could be unsafe.
		@@ -576,6 +580,23 @@ int driver_probe_device(struct device_driver drv, struct device dev)
		return ret;
		}

		static inline bool cmdline_requested_async_probing(const char *drv_name)
		{
		return parse_option_str(async_probe_drv_names, drv_name);
		}

		/* The option format is "driver_async_probe=drv_name1,drv_name2,..." */
		static int __init save_async_options(char *buf)
		{
		if (strlen(buf) >= ASYNC_DRV_NAMES_MAX_LEN)
		printk(KERN_WARNING
		"Too long list of driver names for 'driver_async_probe'!\n");

		strlcpy(async_probe_drv_names, buf, ASYNC_DRV_NAMES_MAX_LEN);
		return 0;
		}
		__setup("driver_async_probe=", save_async_options);

		bool driver_allows_async_probing(struct device_driver *drv)
		{
		switch (drv->probe_type) {
		@@ -586,6 +607,9 @@ bool driver_allows_async_probing(struct device_driver *drv)
		return false;

		default:
		if (cmdline_requested_async_probing(drv->name))
		return true;

		if (module_requested_async_probing(drv->owner))
		return true;