Re: MTD kobject warnings due to block layer changes

[FUJITA Tomonori]

On Fri, 29 Aug 2008 08:50:30 +0200
Jens Axboe <jens.axboe@xxxxxxxxxx> wrote:

> > Ok, I'll send a patch shortly though it would be better to fix
> > 'multiple gendisks share a single request_queue'...
> 
> Naturally, but we can do that in 2.6.28.

Yeah, here is a quick fix.

Manuel, really sorry about the bug and thanks a lot for the
investigation.

=
From: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
Subject: [PATCH] remove blk_register_filter and blk_unregister_filter in genhd.c

This patch remove blk_register_filter and blk_unregister_filter in
gendisk, and adds them to sd.c and sr.c.

The commit abf5439370491dd6fbb4fe1a7939680d2a9bc9d4 moved cmdfilter
from gendisk to request_queue. It turned out that in some subsystems
multiple gendisks share a single request_queue. So we can't call
blk_register_filter in add_disk. Otherwise we get:

Using physmap partition information
Creating 3 MTD partitions on "physmap-flash":
0x00000000-0x01c00000 : "User FS"
0x01c00000-0x01c40000 : "booter"
kobject (8511c410): tried to init an initialized object, something is seriously wrong.
Call Trace:
[<8036644c>] dump_stack+0x8/0x34
[<8021f050>] kobject_init+0x50/0xcc
[<8021fa18>] kobject_init_and_add+0x24/0x58
[<8021d20c>] blk_register_filter+0x4c/0x64
[<8021c194>] add_disk+0x78/0xe0
[<8027d14c>] add_mtd_blktrans_dev+0x254/0x278
[<8027c8f0>] blktrans_notify_add+0x40/0x78
[<80279c00>] add_mtd_device+0xd0/0x150
[<8027b090>] add_mtd_partitions+0x568/0x5d8
[<80285458>] physmap_flash_probe+0x2ac/0x334
[<802644f8>] driver_probe_device+0x12c/0x244
[<8026465c>] __driver_attach+0x4c/0x84
[<80263c64>] bus_for_each_dev+0x58/0xac
[<802633ec>] bus_add_driver+0xc4/0x24c
[<802648e0>] driver_register+0xcc/0x184
[<80100460>] _stext+0x60/0x1bc

In the long term, we need to fix such subsystems but we need a quick
fix now. This patch add the command filter support to only sd and sr
though it might be useful for other SG_IO users (like cciss).

Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxxxxxx>
Reported-by: Manuel Lauss <mano@xxxxxxxxxxxxxxxxxxxxxxx>
Cc: Jens Axboe <jens.axboe@xxxxxxxxxx>
---
 block/cmd-filter.c |    3 ++-
 block/genhd.c      |    2 --
 drivers/scsi/sd.c  |    2 ++
 drivers/scsi/sr.c  |    2 ++
 4 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/block/cmd-filter.c b/block/cmd-filter.c
index 1d40262..228b644 100644
--- a/block/cmd-filter.c
+++ b/block/cmd-filter.c
@@ -223,6 +223,7 @@ int blk_register_filter(struct gendisk *disk)
 
 	return 0;
 }
+EXPORT_SYMBOL(blk_register_filter);
 
 void blk_unregister_filter(struct gendisk *disk)
 {
@@ -231,4 +232,4 @@ void blk_unregister_filter(struct gendisk *disk)
 	kobject_put(&filter->kobj);
 	kobject_put(disk->holder_dir->parent);
 }
-
+EXPORT_SYMBOL(blk_unregister_filter);
diff --git a/block/genhd.c b/block/genhd.c
index 656c2c7..d9743ff 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -190,7 +190,6 @@ void add_disk(struct gendisk *disk)
 			    disk->minors, NULL, exact_match, exact_lock, disk);
 	register_disk(disk);
 	blk_register_queue(disk);
-	blk_register_filter(disk);
 
 	bdi = &disk->queue->backing_dev_info;
 	bdi_register_dev(bdi, MKDEV(disk->major, disk->first_minor));
@@ -203,7 +202,6 @@ EXPORT_SYMBOL(del_gendisk);	/* in partitions/check.c */
 
 void unlink_gendisk(struct gendisk *disk)
 {
-	blk_unregister_filter(disk);
 	sysfs_remove_link(&disk->dev.kobj, "bdi");
 	bdi_unregister(&disk->queue->backing_dev_info);
 	blk_unregister_queue(disk);
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index e5e7d78..2a2bc89 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1875,6 +1875,7 @@ static int sd_probe(struct device *dev)
 
 	dev_set_drvdata(dev, sdkp);
 	add_disk(gd);
+	blk_register_filter(gd);
 	sd_dif_config_host(sdkp);
 
 	sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
@@ -1908,6 +1909,7 @@ static int sd_remove(struct device *dev)
 	struct scsi_disk *sdkp = dev_get_drvdata(dev);
 
 	device_del(&sdkp->dev);
+	blk_unregister_filter(sdkp->disk);
 	del_gendisk(sdkp->disk);
 	sd_shutdown(dev);
 
diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 27f5bfd..3292965 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -656,6 +656,7 @@ static int sr_probe(struct device *dev)
 	dev_set_drvdata(dev, cd);
 	disk->flags |= GENHD_FL_REMOVABLE;
 	add_disk(disk);
+	blk_register_filter(disk);
 
 	sdev_printk(KERN_DEBUG, sdev,
 		    "Attached scsi CD-ROM %s\n", cd->cdi.name);
@@ -894,6 +895,7 @@ static int sr_remove(struct device *dev)
 {
 	struct scsi_cd *cd = dev_get_drvdata(dev);
 
+	blk_unregister_filter(cd->disk);
 	del_gendisk(cd->disk);
 
 	mutex_lock(&sr_ref_mutex);
-- 
1.5.5.GIT

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