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>
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@ -94,6 +94,14 @@ int videobuf_iolock(struct videobuf_queue* q, struct videobuf_buffer *vb,
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MAGIC_CHECK(vb->magic,MAGIC_BUFFER);
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MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
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/* FIXME: This is required to avoid OOPS on some cases, since mmap_mapper()
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method should be called before _iolock.
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On some cases, the mmap_mapper() is called only after scheduling.
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However, this way is just too dirty! Better to wait for some event.
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*/
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schedule_timeout(HZ);
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return CALL(q,iolock,q,vb,fbuf);
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}
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