err (-22) on device initialization

[andyandroid]

When Instantiate with the null_blk driver, I hit err (-22), I am not sure it is a err of lnvm,

andy@andy-MS-7758:~$ sudo modprobe null_blk use_lightnvm=1 gb=4 andy@andy-MS-7758:~$ dmesg |grep nvm [ 1309.903873] nvm: registered nullb0 [1/1/256/4096/1/1] [ 1309.903887] nvm: err (-22) on device initialization [ 1309.903965] nvm: registered nullb1 [1/1/256/4096/1/1] [ 1309.903978] nvm: err (-22) on device initialization

When Instantiate media manager and target with the cmd, the cmd fail and the dmesg show device has no media manager registered

sudo lnvm create -d nullb0 -n mydevice -t rrpc [ 3781.568705] nvm: device has no media manager registered.

Below are basic Linux and kernel info lnvm version: 1.0

andy@andy-MS-7758:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 16.04 LTS Release: 16.04 Codename: xenial andy@andy-MS-7758:~$ uname -a Linux andy-MS-7758 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

[MatiasBjorling]

Hi Andy,

Does it help if you do

sudo modprobe gennvm

and then try again to initialize the target?

[andyandroid]

Hi Matias

I have the same result.

andy@andy-MS-7758:~$ sudo modprobe gennvm [sudo] andy 的密码： andy@andy-MS-7758:~$ sudo modprobe null_blk use_lightnvm=1 gb=4 andy@andy-MS-7758:~$ dmesg |grep nvm [ 229.331590] nvm: registered nullb0 [1/1/256/4096/1/1] [ 229.331603] nvm: err (-22) on device initialization [ 229.331674] nvm: registered nullb1 [1/1/256/4096/1/1] [ 229.331682] nvm: err (-22) on device initialization

[MatiasBjorling]

Hmm, there might be missing a patch for lightnvm that was fixed in the 4.6 cycle.

Could you try installing the latest kernel for ubuntu and see if the problem persist?

http://www.yourownlinux.com/2016/05/how-to-install-linux-kernel-4-6-rc6-in-linux.html

[andyandroid]

Matias

No err after installing latest kernel, Thanks a lot.

[MatiasBjorling]

Thanks for testing it.