Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d5f1b01644b6fd5e9eb480a4762cd6b569cb1246
Commit: d5f1b01644b6fd5e9eb480a4762cd6b569cb1246
Parent: 5ddff43435394c1c2540fcdeed00cb54862c31bf
Author: Mauro Carvalho Chehab <[EMAIL PROTECTED]>
AuthorDate: Mon Oct 8 11:48:57 2007 -0300
Committer: Mauro Carvalho Chehab <[EMAIL PROTECTED]>
CommitDate: Wed Oct 10 00:03:14 2007 -0300
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 <[EMAIL PROTECTED]>
---
drivers/media/video/videobuf-core.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/drivers/media/video/videobuf-core.c
b/drivers/media/video/videobuf-core.c
index 8e4026e..aa402ab 100644
--- a/drivers/media/video/videobuf-core.c
+++ b/drivers/media/video/videobuf-core.c
@@ -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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