Fwd: Removing Giant from a driver
- From: usleepless@xxxxxxxxx
- Date: Sun, 15 Oct 2006 11:04:58 +0200
---------- Forwarded message ----------
From: usleepless@xxxxxxxxx <usleepless@xxxxxxxxx>
Date: Oct 14, 2006 10:32 PM
Subject: Removing Giant from a driver
To: freebsd-questions@xxxxxxxxxxx
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_32BIT,
BUS_SPACE_MAXADDR, NULL, NULL,
CXM_SG_BUFFERS
* sizeof(struct cxm_sg_entry), 1,
BUS_SPACE_MAXSIZE_32BIT, 0,
#if __FreeBSD_version >= 501102
busdma_lock_mutex, &Giant,
#endif
&sc->enc_sg.dmat);
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
routine?
is there a howto somewhere?
regards,
usleep
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