On Sat, 09 Oct 2004 00:58:00 +0100, Robert Clark [EMAIL PROTECTED] wrote:
On Wed, 2004-10-06 at 15:19, Robert Clark wrote:
Oct 5 22:02:21 miller kernel: Oops: 0002 [#1]
The attached (trivial) patch fixes this oops for me but I think this
is only half the problem.
What seems to have been happening is that, without the DRIVER_HAVE_DMA
flag, dev-dma was not being initialised. This caused a problem with the
following code in DRM(irq_install) from drm_irq.h:
dev-dma-next_buffer = NULL;
dev-dma-next_queue = NULL;
dev-dma-this_buffer = NULL;
Dave, these variables don't seem to be in use any more. I commented
out their definitions and everything still compiles.
drmP.h
/** \name DMA support */
/[EMAIL PROTECTED] */
// drm_buf_t *this_buffer; /** Buffer being sent */
// drm_buf_t *next_buffer; /** Selected buffer to send */
// drm_queue_t *next_queue;/** Queue from which buffer selected*/
// wait_queue_head_t waiting; /** Processes waiting on free bufs */
/[EMAIL PROTECTED] */
Is this a left over from gamma maybe?
leading to the null dereference.
I assume these lines need to be wrapped in an
if(drm_core_check_feature(dev, DRIVER_HAVE_DMA)) { } or something, but
I'll leave that to someone who actually understands this code.
Robert
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Jon Smirl
[EMAIL PROTECTED]
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