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driver synchronization: make scsi_wait_scan more advanced 

There is currently only one way for userspace to say "wait for my storage
device to get ready for the modules I just loaded": to load the
scsi_wait_scan module. Expectations of userspace are that once this
module is loaded, all the (storage) devices for which the drivers
were loaded before the module load are present.

Now, there are some issues with the implementation, and the async
stuff got caught in the middle of this: The existing code only
waits for the scsy async probing to finish, but it did not take
into account at all that probing might not have begun yet.
(Russell ran into this problem on his computer and the fix works for him)

This patch fixes this more thoroughly than the previous "fix", which
had some bad side effects (namely, for kernel code that wanted to wait for
the scsi scan it would also do an async sync, which would deadlock if you did
it from async context already.. there's a report about that on lkml):
The patch makes the module first wait for all device driver probes, and then it
will wait for the scsi parallel scan to finish.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Tested-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Arjan van de Ven 2009-04-21 13:32:54 -07:00 committed by Linus Torvalds
parent 5dd559f020
commit d4d5291c8c
4 changed files with 13 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/base/dd.c
View File

@ -179,6 +179,7 @@ void wait_for_device_probe(void)
wait_event(probe_waitqueue, atomic_read(&probe_count) == 0);
async_synchronize_full();
}
EXPORT_SYMBOL_GPL(wait_for_device_probe);
/**
* driver_probe_device - attempt to bind device & driver together

2
drivers/scsi/scsi_scan.c
View File

@ -180,8 +180,6 @@ int scsi_complete_async_scans(void)
spin_unlock(&async_scan_lock);
kfree(data);
/* Synchronize async operations globally */
async_synchronize_full();
return 0;
}

11
drivers/scsi/scsi_wait_scan.c
View File

@ -11,10 +11,21 @@
*/
#include <linux/module.h>
#include <linux/device.h>
#include <scsi/scsi_scan.h>
static int __init wait_scan_init(void)
{
/*
* First we need to wait for device probing to finish;
* the drivers we just loaded might just still be probing
* and might not yet have reached the scsi async scanning
*/
wait_for_device_probe();
/*
* and then we wait for the actual asynchronous scsi scan
* to finish.
*/
scsi_complete_async_scans();
return 0;
}

1
include/linux/device.h
View File

@ -551,6 +551,7 @@ extern int (*platform_notify_remove)(struct device *dev);
extern struct device *get_device(struct device *dev);
extern void put_device(struct device *dev);
extern void wait_for_device_probe(void);
/* drivers/base/power/shutdown.c */
extern void device_shutdown(void);