Removing Giant from a driver
wmoran at collaborativefusion.com
Sat Oct 14 16:50:05 PDT 2006
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This question is a little more technical than this list usually deals
usleepless at gmail.com wrote:
> Hi All,
> i have been tweaking the pvr250 driver to support pvr150s/500s. now i
> want to remove Giant from the code.
> problem is, i am not sure what to do. i have created a mutex which
> replaces the spltty and splx calls. but this crashes my box :-)
> the original code looks like this:
> * Allocate a DMA tag for the scatter / gather list.
> error = bus_dma_tag_create(sc->parent_dmat, 1, 0,
> BUS_SPACE_MAXADDR, NULL, NULL,
> * sizeof(struct cxm_sg_entry), 1,
> BUS_SPACE_MAXSIZE_32BIT, 0,
> #if __FreeBSD_version >= 501102
> busdma_lock_mutex, &Giant,
> what should it look like?
> and how will i prevent the interrupt routine from interfering with
> userland operations? can i place a "mtx_lock()" call in the interrupt
> is there a howto somewhere?
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