Messages in this thread |  | | Date | Fri, 25 Oct 2002 17:22:46 -0500 (CDT) | | From | Kai Germaschewski <> | | Subject | Re: Passing info from the top-half ISR to the bottom-half |
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On Thu, 24 Oct 2002 kernelnewbie@gate.debonne.net wrote:
> My ISR is split into top-half and bottom-half processing. The bottom-half > is implemented as a tasklet (I'm using Kernel 2.4). The top-half knows > which physical device (minor number) caused the interrupt and that info > has to be passed to the tasklet somehow. > > The DECLARE_TASKLET macro provides an unsigned long data argument, but it > appears that that argument must be constant. Rubini's book says it's fine > to pass a pointer via this data argument, and I'd like to pass the pointer > to my device control block, but since the argument must be a constant, the > best I can do is pass a pointer to a global which points to my DCB. But > this won't work because another device's interrupt will overwrite it. > > Do I have to make a separate DECLARE_TASKLET for each physical device like > the following:
I think the answer is yes, you want to have a tasklet per device, but not like what was following ;)
You should just add the struct tasklet_struct into your per-device private data (DCB - driver control block? sounds like Windows to me...), and have it point back to it. Should work just fine, much cleaner than a number of global tasklet declarations.
--Kai
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