Matrox Meteor2 problem

[Christian Schmidt-Madsen]

After an upgrade from Cord Seele's meteor2 driver v. 1.0 to v. 1.1 I am 
experiencing unpredictable errors. More specifically the problem occurs 
when I repeatedly grab a single image from a camera in a loop similar to 
this:

while (condition) {
 ...
 n = read(v4l2->fd, img, v4l2->fmt.fmt.pix.sizeimage);
 ...
 condition = process_image();
}
This runs just fine for a while but then hangs in the read call. The 
debug output from the meteor2 driver is shown below. Since the error 
does not occur everytime I run the code (but on more than half of the 
executions) it is probably a timing/race problem.

<log>
Mar  3 14:58:15 vegan kernel: meteor2[via_v4l2_open]: new id: CAEEFE80  
flags: 0 512
Mar  3 14:58:15 vegan kernel: meteor2[via_v4l2_read]: no filled buffer, 
start snapshot
Mar  3 14:58:15 vegan kernel: meteor2[via_v4l2_read]: no buffers 
requested so far
Mar  3 14:58:15 vegan kernel: meteor2[via_free_himem_bufs]: freeing 3 
stream_bufs @ c1362d80
Mar  3 14:58:15 vegan kernel: meteor2[via_free_himem_bufs]: yanking buf 0
Mar  3 14:58:15 vegan kernel: meteor2[via_free_himem_bufs]: buf 1 not queued
Mar  3 14:58:15 vegan kernel: meteor2[via_free_himem_bufs]: buf 2 not queued
Mar  3 14:58:15 vegan kernel: meteor2[unmap_stream_bufs]: unmapping 3 
bufs @ 0xc1362d80
Mar  3 14:58:15 vegan kernel: meteor2[unmap_stream_bufs]: sbuf->virt: 
0xd8a5f000
Mar  3 14:58:15 vegan kernel: meteor2[unmap_stream_bufs]: sbuf->virt: 
0xd8b90000
Mar  3 14:58:15 vegan kernel: meteor2[unmap_stream_bufs]: sbuf->virt: 
0xd8cc1000
Mar  3 14:58:15 vegan kernel: meteor2[remap_stream_bufs]: mapping 3 bufs 
@ 0xc1362d80
Mar  3 14:58:15 vegan kernel: meteor2[remap_stream_bufs]: addr->virt: 
0xfc00000->0xd8a5f000
Mar  3 14:58:15 vegan kernel: meteor2[remap_stream_bufs]: addr->virt: 
0xfd30000->0xd8b90000
Mar  3 14:58:15 vegan kernel: meteor2[remap_stream_bufs]: addr->virt: 
0xfe60000->0xd8cc1000
Mar  3 14:58:15 vegan kernel: meteor2[via_v4l2_read]: need to queue a 
DMA buffer
Mar  3 14:58:15 vegan kernel: meteor2[via_handle_irq_eog]: INTERNAL 
ERROR: unexpected grab_state 3
</log>

grab_state 3 is STATE_G_PENDING which is set in via_snapshot_start() but 
this function is seemingly only used for streaming video?!

Has any of you experienced similar problems?

- Christian





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