diff options
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/dd.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/base/dd.c b/drivers/base/dd.c index 348fc4695d4d..a823f469e53f 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -57,6 +57,10 @@ static atomic_t deferred_trigger_count = ATOMIC_INIT(0); static struct dentry *deferred_devices; 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. @@ -674,6 +678,23 @@ 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) { @@ -684,6 +705,9 @@ 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; |