* [Fwd: [PATCH]: Fix crash in virtio_blk during modprobe ; rmmod ; modprobe]
@ 2008-05-21 13:12 Chris Lalancette
2008-05-22 11:33 ` Rusty Russell
0 siblings, 1 reply; 6+ messages in thread
From: Chris Lalancette @ 2008-05-21 13:12 UTC (permalink / raw)
To: virtualization; +Cc: kvm
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(sent to the kvm mailing list erroneously first)
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Fix a modprobe virtio_blk ; rmmod virtio_blk ; modprobe virtio_blk crash; this
was basically because we weren't doing "del_gendisk()" in the remove path.
Signed-off-by: Chris Lalancette <clalance@redhat.com>
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commit 9ae82ccb26be0155ad81b2630090e85639a0dc56
Author: Chris Lalancette <clalance@redhat.com>
Date: Fri May 16 15:31:06 2008 -0400
Fix a modprobe virtio_blk ; rmmod virtio_blk ; modprobe virtio_blk crash;
this was basically because we weren't doing "del_gendisk()" in the remove
path.
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 4962e62..c678ac5 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -294,6 +294,7 @@ static void virtblk_remove(struct virtio_device *vdev)
vdev->config->reset(vdev);
blk_cleanup_queue(vblk->disk->queue);
+ del_gendisk(vblk->disk);
put_disk(vblk->disk);
unregister_blkdev(major, "virtblk");
mempool_destroy(vblk->pool);
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^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [Fwd: [PATCH]: Fix crash in virtio_blk during modprobe ; rmmod ; modprobe]
2008-05-21 13:12 [Fwd: [PATCH]: Fix crash in virtio_blk during modprobe ; rmmod ; modprobe] Chris Lalancette
@ 2008-05-22 11:33 ` Rusty Russell
2008-05-22 11:35 ` Jens Axboe
0 siblings, 1 reply; 6+ messages in thread
From: Rusty Russell @ 2008-05-22 11:33 UTC (permalink / raw)
To: Chris Lalancette; +Cc: virtualization, kvm, Jens Axboe
On Wednesday 21 May 2008 23:12:39 Chris Lalancette wrote:
> diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
> index 4962e62..c678ac5 100644
> --- a/drivers/block/virtio_blk.c
> +++ b/drivers/block/virtio_blk.c
> @@ -294,6 +294,7 @@ static void virtblk_remove(struct virtio_device *vdev)
> vdev->config->reset(vdev);
>
> blk_cleanup_queue(vblk->disk->queue);
> + del_gendisk(vblk->disk);
> put_disk(vblk->disk);
> unregister_blkdev(major, "virtblk");
> mempool_destroy(vblk->pool);
Thanks Chris, it seems reasonable and I'm sure it works (kinda hard to test
here, it's my root block dev). Other drivers seem to do blk_cleanup_queue()
*after* del_gendisk: does it matter?
Jens CC'd: he's gentle with my dumb questions...
Rusty.
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Fwd: [PATCH]: Fix crash in virtio_blk during modprobe ; rmmod ; modprobe]
2008-05-22 11:33 ` Rusty Russell
@ 2008-05-22 11:35 ` Jens Axboe
2008-05-22 12:03 ` Chris Lalancette
2008-05-23 1:16 ` Rusty Russell
0 siblings, 2 replies; 6+ messages in thread
From: Jens Axboe @ 2008-05-22 11:35 UTC (permalink / raw)
To: Rusty Russell; +Cc: Chris Lalancette, virtualization, kvm
On Thu, May 22 2008, Rusty Russell wrote:
> On Wednesday 21 May 2008 23:12:39 Chris Lalancette wrote:
> > diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
> > index 4962e62..c678ac5 100644
> > --- a/drivers/block/virtio_blk.c
> > +++ b/drivers/block/virtio_blk.c
> > @@ -294,6 +294,7 @@ static void virtblk_remove(struct virtio_device *vdev)
> > vdev->config->reset(vdev);
> >
> > blk_cleanup_queue(vblk->disk->queue);
> > + del_gendisk(vblk->disk);
> > put_disk(vblk->disk);
> > unregister_blkdev(major, "virtblk");
> > mempool_destroy(vblk->pool);
>
> Thanks Chris, it seems reasonable and I'm sure it works (kinda hard to
> test here, it's my root block dev). Other drivers seem to do
> blk_cleanup_queue() *after* del_gendisk: does it matter?
>
> Jens CC'd: he's gentle with my dumb questions... Rusty.
del_gendisk() can generate IO, so it would seem safer to do that
_before_ putting the queue reference :-)
--
Jens Axboe
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Fwd: [PATCH]: Fix crash in virtio_blk during modprobe ; rmmod ; modprobe]
2008-05-22 11:35 ` Jens Axboe
@ 2008-05-22 12:03 ` Chris Lalancette
2008-05-22 12:07 ` Jens Axboe
2008-05-23 1:16 ` Rusty Russell
1 sibling, 1 reply; 6+ messages in thread
From: Chris Lalancette @ 2008-05-22 12:03 UTC (permalink / raw)
To: Jens Axboe; +Cc: Rusty Russell, virtualization, kvm
Jens Axboe wrote:
> On Thu, May 22 2008, Rusty Russell wrote:
>> On Wednesday 21 May 2008 23:12:39 Chris Lalancette wrote:
>>> diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
>>> index 4962e62..c678ac5 100644
>>> --- a/drivers/block/virtio_blk.c
>>> +++ b/drivers/block/virtio_blk.c
>>> @@ -294,6 +294,7 @@ static void virtblk_remove(struct virtio_device *vdev)
>>> vdev->config->reset(vdev);
>>>
>>> blk_cleanup_queue(vblk->disk->queue);
>>> + del_gendisk(vblk->disk);
>>> put_disk(vblk->disk);
>>> unregister_blkdev(major, "virtblk");
>>> mempool_destroy(vblk->pool);
>> Thanks Chris, it seems reasonable and I'm sure it works (kinda hard to
>> test here, it's my root block dev). Other drivers seem to do
>> blk_cleanup_queue() *after* del_gendisk: does it matter?
>>
>> Jens CC'd: he's gentle with my dumb questions... Rusty.
>
> del_gendisk() can generate IO, so it would seem safer to do that
> _before_ putting the queue reference :-)
>
Ah, good to know. Out of curiousity, why would del_gendisk() generate
additional I/O?
Chris Lalancette
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Fwd: [PATCH]: Fix crash in virtio_blk during modprobe ; rmmod ; modprobe]
2008-05-22 12:03 ` Chris Lalancette
@ 2008-05-22 12:07 ` Jens Axboe
0 siblings, 0 replies; 6+ messages in thread
From: Jens Axboe @ 2008-05-22 12:07 UTC (permalink / raw)
To: Chris Lalancette; +Cc: Rusty Russell, virtualization, kvm
On Thu, May 22 2008, Chris Lalancette wrote:
> Jens Axboe wrote:
> > On Thu, May 22 2008, Rusty Russell wrote:
> >> On Wednesday 21 May 2008 23:12:39 Chris Lalancette wrote:
> >>> diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
> >>> index 4962e62..c678ac5 100644
> >>> --- a/drivers/block/virtio_blk.c
> >>> +++ b/drivers/block/virtio_blk.c
> >>> @@ -294,6 +294,7 @@ static void virtblk_remove(struct virtio_device *vdev)
> >>> vdev->config->reset(vdev);
> >>>
> >>> blk_cleanup_queue(vblk->disk->queue);
> >>> + del_gendisk(vblk->disk);
> >>> put_disk(vblk->disk);
> >>> unregister_blkdev(major, "virtblk");
> >>> mempool_destroy(vblk->pool);
> >> Thanks Chris, it seems reasonable and I'm sure it works (kinda hard to
> >> test here, it's my root block dev). Other drivers seem to do
> >> blk_cleanup_queue() *after* del_gendisk: does it matter?
> >>
> >> Jens CC'd: he's gentle with my dumb questions... Rusty.
> >
> > del_gendisk() can generate IO, so it would seem safer to do that
> > _before_ putting the queue reference :-)
> >
>
> Ah, good to know. Out of curiousity, why would del_gendisk() generate
> additional I/O?
It does invalidate+sync.
--
Jens Axboe
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [Fwd: [PATCH]: Fix crash in virtio_blk during modprobe ; rmmod ; modprobe]
2008-05-22 11:35 ` Jens Axboe
2008-05-22 12:03 ` Chris Lalancette
@ 2008-05-23 1:16 ` Rusty Russell
1 sibling, 0 replies; 6+ messages in thread
From: Rusty Russell @ 2008-05-23 1:16 UTC (permalink / raw)
To: Jens Axboe; +Cc: Chris Lalancette, virtualization, kvm
On Thursday 22 May 2008 21:35:19 Jens Axboe wrote:
> On Thu, May 22 2008, Rusty Russell wrote:
> > Thanks Chris, it seems reasonable and I'm sure it works (kinda hard to
> > test here, it's my root block dev). Other drivers seem to do
> > blk_cleanup_queue() *after* del_gendisk: does it matter?
> >
> > Jens CC'd: he's gentle with my dumb questions... Rusty.
>
> del_gendisk() can generate IO, so it would seem safer to do that
> _before_ putting the queue reference :-)
Thanks Jens. Chris, I've fixed that up here.
Cheers,
Rusty.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2008-05-23 1:16 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2008-05-21 13:12 [Fwd: [PATCH]: Fix crash in virtio_blk during modprobe ; rmmod ; modprobe] Chris Lalancette
2008-05-22 11:33 ` Rusty Russell
2008-05-22 11:35 ` Jens Axboe
2008-05-22 12:03 ` Chris Lalancette
2008-05-22 12:07 ` Jens Axboe
2008-05-23 1:16 ` Rusty Russell
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