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V4L/DVB (7023): Fix a regresion left by changeset 7e65d6e8f6df

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Changeset 7e65d6e8f6df removed a very bad hack on mmap(). However, the fixes
weren't considering usermap and overlay memory models. This were breaking
direct reading from /dev/video?, used mostly by mpeg aware drivers.

Thanks to Steven Toth <stoth@linuxtv.org> for reporting the issue and
bissecting it.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Mauro Carvalho Chehab 2008-01-13 19:40:30 -03:00
parent dfd8c04ec1
commit 1f8d30083a
1 changed files with 8 additions and 4 deletions
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12
drivers/media/video/videobuf-core.c
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@ -102,10 +102,14 @@ int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb,
since mmap_mapper() method should be called before _iolock. since mmap_mapper() method should be called before _iolock.
On some cases, the mmap_mapper() is called only after scheduling. On some cases, the mmap_mapper() is called only after scheduling.
*/ */
wait_event_timeout(vb->done, q->is_mmapped, msecs_to_jiffies(100)); if (vb->memory == V4L2_MEMORY_MMAP) {
if (!q->is_mmapped) { wait_event_timeout(vb->done, q->is_mmapped,
printk(KERN_ERR "Error: mmap_mapper() never called!\n"); msecs_to_jiffies(100));
return -EINVAL; if (!q->is_mmapped) {
printk(KERN_ERR
"Error: mmap_mapper() never called!\n");
return -EINVAL;
}
} }
return CALL(q, iolock, q, vb, fbuf); return CALL(q, iolock, q, vb, fbuf);