The patch titled
init: wait for asynchronously scanned block devices
has been added to the -mm tree. Its filename is
init-wait-for-asynchronously-scanned-block-devices.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: init: wait for asynchronously scanned block devices
From: Pierre Ossman <drzeus-list@xxxxxxxxx>
Some buses (e.g. USB and MMC) do their scanning of devices in the
background, causing a race between them and prepare_namespace(). In order
to be able to use these buses without an initrd, we now wait for the device
specified in root= to actually show up.
If the device never shows up than we will hang in an infinite loop. In
order to not mess with setups that reboot on panic, the feature must be
turned on via the command line option "rootwait".
Signed-off-by: Pierre Ossman <drzeus@xxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
init/do_mounts.c | 22 ++++++++++++++++++++--
1 file changed, 20 insertions(+), 2 deletions(-)
diff -puN init/do_mounts.c~init-wait-for-asynchronously-scanned-block-devices init/do_mounts.c
--- a/init/do_mounts.c~init-wait-for-asynchronously-scanned-block-devices
+++ a/init/do_mounts.c
@@ -25,6 +25,7 @@ int __initdata rd_doload; /* 1 = load RA
int root_mountflags = MS_RDONLY | MS_SILENT;
char * __initdata root_device_name;
static char __initdata saved_root_name[64];
+int __initdata root_wait;
dev_t ROOT_DEV;
@@ -216,6 +217,14 @@ static int __init root_dev_setup(char *l
__setup("root=", root_dev_setup);
+static int __init rootwait_setup(char *line)
+{
+ root_wait = simple_strtol(line,NULL,0);
+ return 1;
+}
+
+__setup("rootwait=", rootwait_setup);
+
static char * __initdata root_mount_data;
static int __init root_data_setup(char *str)
{
@@ -438,11 +447,20 @@ 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;
_
Patches currently in -mm which might be from drzeus-list@xxxxxxxxx are
init-wait-for-asynchronously-scanned-block-devices.patch
-
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