On 02 Oct 2009, at 11:44 AM, Harinderjit Singh Sandhu wrote:
nw i got the follwing result when i inserted this module:
----------------------------------------------------------------------
Oct 2 14:46:47 AnkurAggarwal kernel: Ank$: Hello module registered
successfully!
Oct 2 14:46:47 AnkurAggarwal kernel: Ank$: Memory allocation
successful
Oct 2 14:46:47 AnkurAggarwal kernel: Ank$: Port Available
Oct 2 14:46:47 AnkurAggarwal kernel: Ank$:cdev successful
Oct 2 14:46:47 AnkurAggarwal kernel: Ank$: Generation of Interrupt
starts
Oct 2 14:46:47 AnkurAggarwal kernel: Anks:ret:-16
Oct 2 14:46:47 AnkurAggarwal kernel: Press a key...
Oct 2 14:46:47 AnkurAggarwal kernel: >>> PARALLEL PORT INT HANDLED
Oct 2 14:46:47 AnkurAggarwal kernel: Ank$: ret=-16
Oct 2 14:46:47 AnkurAggarwal kernel: Generating interrupt now on
all output pins (intr/ACK = pin 10)
Oct 2 14:46:47 AnkurAggarwal kernel: Interrupt generated. You
should see the handler-message
-----------------------------------------------------------------------------------------------------------------------
the return value for request_irq() is negative but still it shows
the handler message. what could be the problem ???
Did you remember free_irq in the module exit code? Its possible the
second time you load the module it cannot acquire the interrupt
because it was never released the first time (just guessing here). If
thats the case, you must add free_irq and you may have to reboot.
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