| Message ID | 20210920072726.1159572-4-hch@lst.de (mailing list archive) |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [1/3] nvdimm/pmem: fix creating the dax group | expand |
On Mon, Sep 20, 2021 at 09:27:26AM +0200, Christoph Hellwig wrote: > The proper API is to pass the groups to device_add_disk, but the code > used to also allow groups being set before calling *add_disk. Warn > about that but keep the group pointer intact for now so that it can > be removed again after a grace period. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > Fixes: 52b85909f85d ("block: fold register_disk into device_add_disk") Reviewed-by: Ira Weiny <ira.weiny@intel.com> > --- > block/genhd.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/block/genhd.c b/block/genhd.c > index 7b6e5e1cf9564..409cf608cc5bd 100644 > --- a/block/genhd.c > +++ b/block/genhd.c > @@ -439,7 +439,8 @@ int device_add_disk(struct device *parent, struct gendisk *disk, > dev_set_uevent_suppress(ddev, 1); > > ddev->parent = parent; > - ddev->groups = groups; > + if (!WARN_ON_ONCE(ddev->groups)) > + ddev->groups = groups; > dev_set_name(ddev, "%s", disk->disk_name); > if (!(disk->flags & GENHD_FL_HIDDEN)) > ddev->devt = MKDEV(disk->major, disk->first_minor); > -- > 2.30.2 >
On Mon, Sep 20, 2021 at 12:30 AM Christoph Hellwig <hch@lst.de> wrote: > > The proper API is to pass the groups to device_add_disk, but the code > used to also allow groups being set before calling *add_disk. Warn > about that but keep the group pointer intact for now so that it can > be removed again after a grace period. > > Signed-off-by: Christoph Hellwig <hch@lst.de> > Fixes: 52b85909f85d ("block: fold register_disk into device_add_disk") > --- > block/genhd.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/block/genhd.c b/block/genhd.c > index 7b6e5e1cf9564..409cf608cc5bd 100644 > --- a/block/genhd.c > +++ b/block/genhd.c > @@ -439,7 +439,8 @@ int device_add_disk(struct device *parent, struct gendisk *disk, > dev_set_uevent_suppress(ddev, 1); > > ddev->parent = parent; > - ddev->groups = groups; > + if (!WARN_ON_ONCE(ddev->groups)) > + ddev->groups = groups; That feels too compact to me, and dev_WARN_ONCE() might save someone a git blame to look up the reason for the warning: dev_WARN_ONCE(parent, ddev->groups, "unexpected pre-populated attribute group\n"); if (!ddev->groups) ddev->groups = groups; ...but not a deal breaker. Either way you can add: Reviewed-by: Dan Williams <dan.j.williams@intel.com> Jens, I'm ok for the final spin of this series to go through block.git since the referenced commits in Fixes: went that route, just let me know if you want me to take them.
On Mon, Sep 20, 2021 at 04:50:03PM -0700, Dan Williams wrote: > > > > ddev->parent = parent; > > - ddev->groups = groups; > > + if (!WARN_ON_ONCE(ddev->groups)) > > + ddev->groups = groups; > > That feels too compact to me, and dev_WARN_ONCE() might save someone a > git blame to look up the reason for the warning: > > dev_WARN_ONCE(parent, ddev->groups, "unexpected pre-populated > attribute group\n"); > if (!ddev->groups) > ddev->groups = groups; > > ...but not a deal breaker. Either way you can add: > I'd rather keep it simple and optmize for the normal case..
diff --git a/block/genhd.c b/block/genhd.c index 7b6e5e1cf9564..409cf608cc5bd 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -439,7 +439,8 @@ int device_add_disk(struct device *parent, struct gendisk *disk, dev_set_uevent_suppress(ddev, 1); ddev->parent = parent; - ddev->groups = groups; + if (!WARN_ON_ONCE(ddev->groups)) + ddev->groups = groups; dev_set_name(ddev, "%s", disk->disk_name); if (!(disk->flags & GENHD_FL_HIDDEN)) ddev->devt = MKDEV(disk->major, disk->first_minor);
The proper API is to pass the groups to device_add_disk, but the code used to also allow groups being set before calling *add_disk. Warn about that but keep the group pointer intact for now so that it can be removed again after a grace period. Signed-off-by: Christoph Hellwig <hch@lst.de> Fixes: 52b85909f85d ("block: fold register_disk into device_add_disk") --- block/genhd.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)