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dm: only initialize md->dax_dev if CONFIG_DAX_DRIVER is enabled

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md->dax_dev defaults to NULL and there is no need to initialize it
if CONFIG_DAX_DRIVER is disabled.

Signed-off-by: Peng Wang <rocking@whu.edu.cn>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Peng Wang 2019-04-18 21:59:19 +08:00 committed by Mike Snitzer
parent 5de719e3d0
commit 514cf4f881
1 changed files with 2 additions and 4 deletions
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6
drivers/md/dm.c
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@ -1906,7 +1906,6 @@ static void cleanup_mapped_device(struct mapped_device *md)
static struct mapped_device *alloc_dev(int minor)
{
int r, numa_node_id = dm_get_numa_node();
struct dax_device *dax_dev = NULL;
struct mapped_device *md;
void *old_md;
@ -1969,11 +1968,10 @@ static struct mapped_device *alloc_dev(int minor)
sprintf(md->disk->disk_name, "dm-%d", minor);
if (IS_ENABLED(CONFIG_DAX_DRIVER)) {
dax_dev = alloc_dax(md, md->disk->disk_name, &dm_dax_ops);
if (!dax_dev)
md->dax_dev = alloc_dax(md, md->disk->disk_name, &dm_dax_ops);
if (!md->dax_dev)
goto bad;
}
md->dax_dev = dax_dev;
add_disk_no_queue_reg(md->disk);
format_dev_t(md->name, MKDEV(_major, minor));