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author | Soeren Moch <smoch@web.de> | 2013-06-06 00:26:23 (GMT) |
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committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2013-06-19 14:48:09 (GMT) |
commit | 414abbd2cd4c2618895f02ed3a76ec6647281436 (patch) | |
tree | 07f702deb5fa62d94ac1fcb8820454a62c42aadf /Documentation/DocBook/media/v4l | |
parent | 6914d70ecf53e90814fd6d4c8e413b3a8f708d38 (diff) | |
download | linux-fsl-qoriq-414abbd2cd4c2618895f02ed3a76ec6647281436.tar.xz |
[media] media: dmxdev: remove dvb_ringbuffer_flush() on writer side
In dvb_ringbuffer lock-less synchronizationof reader and writer threads is done
with separateread and write pointers. Sincedvb_ringbuffer_flush() modifies the
read pointer, this function must not be called from the writer thread.
This patch removes the dvb_ringbuffer_flush() calls in the dmxdev ringbuffer
write functions, this fixes Oopses "Unable to handle kernel paging request"
I could observe for the call chaindvb_demux_read ->dvb_dmxdev_buffer_read ->
dvb_ringbuffer_read_user -> __copy_to_user (the reader side of the ringbuffer).
The flush calls at the write side are not necessary anyway since ringbuffer_flush
is also called in dvb_dmxdev_buffer_read() when an error condition is set in the
ringbuffer.
This patch should also be applied to stable kernels.
Signed-off-by: Soeren Moch <smoch@web.de>
CC: <stable@vger.kernel.org>
Reviewed-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation/DocBook/media/v4l')
0 files changed, 0 insertions, 0 deletions