Copy_to_user and copy_from_user

[Ramesh Sudini]

Hi,

If copy_from_user returns non zero value, then I do not see any driver(for 
example PPP) try to copy the remaining data. It treats it as an error 
scenario.

Why is this? Shouldnt it have a while loop and attempt to copy_from_user 
till all the data is copied??

I am writing a driver and trying to understand what needs to be done in case 
it returns a non-zero value? I have huge amount of data to be copied from 
user space Ex: 3000byte messages.

Can somebody suggest me what is the best I could do...(Please cc me 
personally with your response)

Thanks
Ramesh

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