[PATCH] md: fix /proc/mdstat refcounting

[Akinobu Mita]

I have seen mdadm oops after successfully unloading md module.

This patch privents from unloading md module while
mdadm is polling /proc/mdstat.

Cc: Neil Brown <neilb@xxxxxxx>
Signed-off-by: Akinbou Mita <akinobu.mita@xxxxxxxxx>

Index: work-fault-inject/drivers/md/md.c
===================================================================
--- work-fault-inject.orig/drivers/md/md.c
+++ work-fault-inject/drivers/md/md.c
@@ -4912,6 +4912,7 @@ static unsigned int mdstat_poll(struct f
 }
 
 static struct file_operations md_seq_fops = {
+	.owner		= THIS_MODULE,
 	.open           = md_seq_open,
 	.read           = seq_read,
 	.llseek         = seq_lseek,
-
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