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V4L/DVB (6291): Fix: avoid oops on some SMP machines 

This workaround fix a bug that happens on some SMP machines. On those machines,
videobuf_iolock is called too soon, before file .mmap handler. This patch calls
the scheduler before iolocking, allowing it to properly call the pending mmap.

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Mauro Carvalho Chehab 2007-10-08 11:48:57 -03:00
parent 5ddff43435
commit d5f1b01644
1 changed files with 8 additions and 0 deletions
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8
drivers/media/video/videobuf-core.c
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@ -94,6 +94,14 @@ int videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb,
MAGIC_CHECK(vb->magic,MAGIC_BUFFER); MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS); MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
/* FIXME: This is required to avoid OOPS on some cases, since mmap_mapper()
method should be called before _iolock.
On some cases, the mmap_mapper() is called only after scheduling.
However, this way is just too dirty! Better to wait for some event.
*/
schedule_timeout(HZ);
return CALL(q,iolock,q,vb,fbuf); return CALL(q,iolock,q,vb,fbuf);
} }