[PATCH v2] nvme: fix cdev lifetime

[John Garry]

On 13/07/2026 10:30, Christoph Hellwig wrote:
>>   	.compat_ioctl	= compat_ptr_ioctl,
>>   	.uring_cmd	= nvme_ns_head_chr_uring_cmd,
>> @@ -666,10 +646,12 @@ static void nvme_add_ns_head_cdev(struct nvme_ns_head *head)
>>   	snprintf(name, sizeof(name), "ng%dn%d", head->subsys->instance,
>>   		 head->instance);
>>   
>> +	nvme_tryget_ns_head(head); /* Undone in nvme_cdev_rel() */
> I think we need to do a real get and not a tryget here.
> 

ok, np.

Then I am going to propose adding nvme_get_ns_head() also. It can be 
used elsewhere and it would match better with nvme_put_ns_head() (rather 
than using kref_fget(&head->kref) here)