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lightnvm: prevent target type module removal when in use

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If target type module e.g. pblk here is unloaded (rmmod) while module
is in use (after creating target) system crashes.  We fix this by
using module API refcnt.

Signed-off-by: Rakesh Pandit <rakesh@tuxera.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Rakesh Pandit
2017-10-13 14:45:50 +02:00
committed by Jens Axboe
parent 47bc227dee
commit 900148296b
3 changed files with 6 additions and 0 deletions
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4
drivers/lightnvm/core.c
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@@ -22,6 +22,7 @@
#include <linux/types.h>
#include <linux/sem.h>
#include <linux/bitmap.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/miscdevice.h>
#include <linux/lightnvm.h>
@@ -316,6 +317,8 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
list_add_tail(&t->list, &dev->targets);
mutex_unlock(&dev->mlock);
__module_get(tt->owner);
return 0;
err_sysfs:
if (tt->exit)
@@ -351,6 +354,7 @@ static void __nvm_remove_target(struct nvm_target *t)
nvm_remove_tgt_dev(t->dev, 1);
put_disk(tdisk);
module_put(t->type->owner);
list_del(&t->list);
kfree(t);