add_disk() make my driver's initialisation, thus kernel stall.

[张云]

Maybe I had misunderstood your meaning. 
You are meaning I have assign 0 to my device major number? 
The major variable is reassigned by the kernel in blkplay_init function.

http://stackoverflow.com/questions/13518404/add-disk-hangs-on-insmod <http://stackoverflow.com/questions/13518404/add-disk-hangs-on-insmod>
This post solve the problem.

Now, I can compile it, insmod it. But it’s give me a permission error when I open the device.

> On Mar 21, 2016, at 10:55 AM, Valdis.Kletnieks at vt.edu wrote:
> 
> On Mon, 21 Mar 2016 09:53:47 +0800, 张云 said:
>> The code is just for learning block driver
> 
> THe kernel doesn't know that.  You call a routine with the wrong
> parameters, it will not work properly.

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