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authorMauro Carvalho Chehab <mchehab@infradead.org>2007-10-08 18:48:57 +0400
committerMauro Carvalho Chehab <mchehab@infradead.org>2007-10-10 07:03:14 +0400
commitd5f1b01644b6fd5e9eb480a4762cd6b569cb1246 (patch)
tree817c0b83d2c64e2b5d7f2f5de93ebdbc7d1705b7 /drivers/media
parent5ddff43435394c1c2540fcdeed00cb54862c31bf (diff)
downloadlinux-d5f1b01644b6fd5e9eb480a4762cd6b569cb1246.tar.xz
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>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/video/videobuf-core.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/media/video/videobuf-core.c b/drivers/media/video/videobuf-core.c
index 8e4026e6fae3..aa402abc4b0c 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);
}