When creation process is still in progress, target is not yet on targets list. This causes a chance for removing whole lightnvm subsystem by calling nvm_unregister() in the meantime and finally by causing kernel panic inside target init function. This patch changes the behaviour by adding kref variable which tracks all the users of nvm_dev structure. When nvm_dev is allocated, kref value is set to 1. Then before every target creation the value is increased and decreased after target removal. The extra reference is decreased when nvm subsystem is unregistered.
Showing the changes to include/linux (1 of 2 files). Show all
Unified · Split
| @@ -428,6 +428,7 @@ struct nvm_dev { · 427 unmodified lines | ||
| 428 | 428 | char name[DISK_NAME_LEN]; |
| 429 | 429 | void *private_data; |
| 430 | 430 | |
| 431 | + struct kref ref; | |
| 431 | 432 | void *rmap; |
| 432 | 433 | |
| 433 | 434 | struct mutex mlock; |