kernel.log

[51977.288228] Device registered.
[51977.590111] Device opened 1 times
[51977.593126] Device opened 2 times
[51977.593126] to be written : hello
[51977.595583] Device minor : 0
[51977.597429] Write position1 : 0
[51977.600071] Write 0 h
[51977.602284] Write 1 e
[51977.604227] Write 2 l
[51977.606421] Write 3 l
[51977.608409] Write 4 o
[51977.609439] Write position1 now: 5    and count5
[51977.612896] Device is closed
[51977.614101] Device opened 3 times
[51977.622143] to be written : hello
[51977.624497] Device minor : 0
[51977.628951] Write position1 : 5
[51977.631203] Write 0 h
[51977.632974] Write 1 e
[51977.635129] Write 2 l
[51977.636908] Write 3 l
[51977.639119] Write 4 o
[51977.642392] Write position1 now: 0    and count5
[51977.645296] to be written : hello
[51977.648768] Device minor : 0
[51977.650553] Write position1 : 0
[51981.418661] buffer1 flag didn't work  0
[51981.419422] Device is closed
[51981.422197] Device is closed