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-rw-r--r--Documentation/admin-guide/kernel-parameters.txt4
-rw-r--r--init/do_mounts.c38
2 files changed, 40 insertions, 2 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index a1457995fd41..387cf9c2a2c5 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -5501,6 +5501,10 @@
Useful for devices that are detected asynchronously
(e.g. USB and MMC devices).
+ rootwait= [KNL] Maximum time (in seconds) to wait for root device
+ to show up before attempting to mount the root
+ filesystem.
+
rproc_mem=nn[KMG][@address]
[KNL,ARM,CMA] Remoteproc physical memory block.
Memory area to be used by remote processor image,
diff --git a/init/do_mounts.c b/init/do_mounts.c
index 1aa015883519..5dfd30b13f48 100644
--- a/init/do_mounts.c
+++ b/init/do_mounts.c
@@ -18,6 +18,7 @@
#include <linux/slab.h>
#include <linux/ramfs.h>
#include <linux/shmem_fs.h>
+#include <linux/ktime.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_fs_sb.h>
@@ -71,12 +72,37 @@ static int __init rootwait_setup(char *str)
{
if (*str)
return 0;
- root_wait = 1;
+ root_wait = -1;
return 1;
}
__setup("rootwait", rootwait_setup);
+static int __init rootwait_timeout_setup(char *str)
+{
+ int sec;
+
+ if (kstrtoint(str, 0, &sec) || sec < 0) {
+ pr_warn("ignoring invalid rootwait value\n");
+ goto ignore;
+ }
+
+ if (check_mul_overflow(sec, MSEC_PER_SEC, &root_wait)) {
+ pr_warn("ignoring excessive rootwait value\n");
+ goto ignore;
+ }
+
+ return 1;
+
+ignore:
+ /* Fallback to indefinite wait */
+ root_wait = -1;
+
+ return 1;
+}
+
+__setup("rootwait=", rootwait_timeout_setup);
+
static char * __initdata root_mount_data;
static int __init root_data_setup(char *str)
{
@@ -384,14 +410,22 @@ void __init mount_root(char *root_device_name)
/* wait for any asynchronous scanning to complete */
static void __init wait_for_root(char *root_device_name)
{
+ ktime_t end;
+
if (ROOT_DEV != 0)
return;
pr_info("Waiting for root device %s...\n", root_device_name);
+ end = ktime_add_ms(ktime_get_raw(), root_wait);
+
while (!driver_probe_done() ||
- early_lookup_bdev(root_device_name, &ROOT_DEV) < 0)
+ early_lookup_bdev(root_device_name, &ROOT_DEV) < 0) {
msleep(5);
+ if (root_wait > 0 && ktime_after(ktime_get_raw(), end))
+ break;
+ }
+
async_synchronize_full();
}