On 09/08/2017 02:35 PM, Rakesh Pandit wrote:
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 <rak...@tuxera.com> --- drivers/lightnvm/core.c | 4 ++++ drivers/lightnvm/pblk-init.c | 1 + include/linux/lightnvm.h | 1 + 3 files changed, 6 insertions(+) diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c index bbea2c8..c39f87d 100644 --- a/drivers/lightnvm/core.c +++ b/drivers/lightnvm/core.c @@ -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); diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c index 5fe926b..77d6120 100644 --- a/drivers/lightnvm/pblk-init.c +++ b/drivers/lightnvm/pblk-init.c @@ -1059,6 +1059,7 @@ static struct nvm_tgt_type tt_pblk = {.sysfs_init = pblk_sysfs_init,.sysfs_exit = pblk_sysfs_exit, + .owner = THIS_MODULE, };static int __init pblk_module_init(void)diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h index 81b71c6d..78a22e0 100644 --- a/include/linux/lightnvm.h +++ b/include/linux/lightnvm.h @@ -461,6 +461,7 @@ struct nvm_tgt_type {/* For internal use */struct list_head list; + struct module *owner; };extern struct nvm_tgt_type *nvm_find_target_type(const char *, int);
Thanks Rakesh. I've picked it up for 4.15.
