提交 d5f1b016 编写于 作者: M Mauro Carvalho Chehab

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: NMauro Carvalho Chehab <mchehab@infradead.org>
上级 5ddff434
......@@ -94,6 +94,14 @@ int videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb,
MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
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);
}
......
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