diff options
| -rw-r--r-- | Documentation/kernel-parameters.txt | 4 | ||||
| -rw-r--r-- | init/do_mounts.c | 24 |
2 files changed, 26 insertions, 2 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index a0362d5a911..a571495a9ac 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1504,6 +1504,10 @@ and is between 256 and 4096 characters. It is defined in the file rootfstype= [KNL] Set root filesystem type + rootwait [KNL] Wait (indefinitely) for root device to show up. + Useful for devices that are detected asynchronously + (e.g. USB and MMC devices). + rw [KNL] Mount root device read-write on boot S [KNL] Run init in single mode diff --git a/init/do_mounts.c b/init/do_mounts.c index 46fe407fb03..4efa1e5385e 100644 --- a/init/do_mounts.c +++ b/init/do_mounts.c @@ -25,6 +25,7 @@ int __initdata rd_doload; /* 1 = load RAM disk, 0 = don't load */ int root_mountflags = MS_RDONLY | MS_SILENT; char * __initdata root_device_name; static char __initdata saved_root_name[64]; +static int __initdata root_wait; dev_t ROOT_DEV; @@ -216,6 +217,16 @@ static int __init root_dev_setup(char *line) __setup("root=", root_dev_setup); +static int __init rootwait_setup(char *str) +{ + if (*str) + return 0; + root_wait = 1; + return 1; +} + +__setup("rootwait", rootwait_setup); + static char * __initdata root_mount_data; static int __init root_data_setup(char *str) { @@ -438,11 +449,20 @@ void __init prepare_namespace(void) root_device_name += 5; } - is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; - if (initrd_load()) goto out; + /* wait for any asynchronous scanning to complete */ + if ((ROOT_DEV == 0) && root_wait) { + printk(KERN_INFO "Waiting for root device %s...\n", + saved_root_name); + while (driver_probe_done() != 0 || + (ROOT_DEV = name_to_dev_t(saved_root_name)) == 0) + msleep(100); + } + + is_floppy = MAJOR(ROOT_DEV) == FLOPPY_MAJOR; + if (is_floppy && rd_doload && rd_load_disk(0)) ROOT_DEV = Root_RAM0; |