| Message ID | 20220902171609.23376-3-logang@deltatee.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Couple more bug fixes from recent commits | expand |
Looks good:
Reviewed-by: Christoph Hellwig <hch@lst.de>
On 9/3/22 1:16 AM, Logan Gunthorpe wrote: > A regression is seen where mddev devices stay permanently after they > are stopped due to an elevated reference count. > > This was tracked down to an extra mddev_get() in md_seq_start(). > > It only happened rarely because most of the time the md_seq_start() > is called with a zero offset. The path with an extra mddev_get() only > happens when it starts with a non-zero offset. > > The commit noted below changed an mddev_get() to check its success > but inadevrtantly left the original call in. Remove the extra call. > > Fixes: 12a6caf27324 ("md: only delete entries from all_mddevs when the disk is freed") > Signed-off-by: Logan Gunthorpe <logang@deltatee.com> > --- > drivers/md/md.c | 1 - > 1 file changed, 1 deletion(-) > > diff --git a/drivers/md/md.c b/drivers/md/md.c > index afaf36b2f6ab..9dc0175280b4 100644 > --- a/drivers/md/md.c > +++ b/drivers/md/md.c > @@ -8154,7 +8154,6 @@ static void *md_seq_start(struct seq_file *seq, loff_t *pos) > list_for_each(tmp,&all_mddevs) > if (!l--) { > mddev = list_entry(tmp, struct mddev, all_mddevs); > - mddev_get(mddev); > if (!mddev_get(mddev)) > continue; > spin_unlock(&all_mddevs_lock); Acked-by: Guoqing Jiang <Guoqing.jiang@linux.dev> Thanks, Guoqing
diff --git a/drivers/md/md.c b/drivers/md/md.c index afaf36b2f6ab..9dc0175280b4 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -8154,7 +8154,6 @@ static void *md_seq_start(struct seq_file *seq, loff_t *pos) list_for_each(tmp,&all_mddevs) if (!l--) { mddev = list_entry(tmp, struct mddev, all_mddevs); - mddev_get(mddev); if (!mddev_get(mddev)) continue; spin_unlock(&all_mddevs_lock);
A regression is seen where mddev devices stay permanently after they are stopped due to an elevated reference count. This was tracked down to an extra mddev_get() in md_seq_start(). It only happened rarely because most of the time the md_seq_start() is called with a zero offset. The path with an extra mddev_get() only happens when it starts with a non-zero offset. The commit noted below changed an mddev_get() to check its success but inadevrtantly left the original call in. Remove the extra call. Fixes: 12a6caf27324 ("md: only delete entries from all_mddevs when the disk is freed") Signed-off-by: Logan Gunthorpe <logang@deltatee.com> --- drivers/md/md.c | 1 - 1 file changed, 1 deletion(-)