I am using Redhat 6.0 with kernel release 2.2.5-13
I have acquired an VME bus loadable char device module
driver that utilizes standard ANSI C file management calls
i.e. open(), close() ioctl() and close() to manage the VME
bus as a device.
After much debugging the module driver with printk calls;
when the close(fd) function in the user code is called the
kernel does not call the drivername_release() function, it
is calling the drivername_flush(). The file_operations
structure located in fs.h shows flush() located between
open() and close().
It should be noted the VME module did not have a drivername_
flush() function and close(fd) was returning a, zero meaning
no errors. The file_operations struct drivername_fops used
a NULL character placed between the open and release fields
as done in many examples. I ended up writing a stub
function for drivername_flush() and put a printk in it and
found out it was being called when close was called.
I have scratched the hard disk and rebuilt the kernel to no
avail.
As I understand somewhere between kernel 2.0.xx and 2.1xx
this structure was changed too the current format used
kernel 2.2.5-13.
Thus am I dealing with a bad kernel version, a kernel bug or
some slight of hand I don't understand.
Thank you for your help,
Greg McCrea
480-891-5379
greg.mccrea@boeing.com
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