md: change hot_remove_disk to take an rdev rather than a number.

Soon an array will be able to have multiple devices with the
same raid_disk number (an original and a replacement).  So removing
a device based on the number won't work.  So pass the actual device
handle instead.

Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 3 insertions, 4 deletions

diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c
index 5899246fa37..a222f516660 100644
--- a/drivers/md/multipath.c
+++ b/drivers/md/multipath.c
@@ -292,17 +292,16 @@ static int multipath_add_disk(struct mddev *mddev, struct md_rdev *rdev)
         return err;
 }
 
-static int multipath_remove_disk(struct mddev *mddev, int number)
+static int multipath_remove_disk(struct mddev *mddev, struct md_rdev *rdev)
 {
         struct mpconf *conf = mddev->private;
         int err = 0;
-        struct md_rdev *rdev;
+        int number = rdev->raid_disk;
         struct multipath_info *p = conf->multipaths + number;
 
         print_multipath_conf(conf);
 
-        rdev = p->rdev;
-        if (rdev) {
+        if (rdev == p->rdev) {
                 if (test_bit(In_sync, &rdev->flags) ||
                     atomic_read(&rdev->nr_pending)) {
                         printk(KERN_ERR "hot-remove-disk, slot %d is identified"