Dave, thank you for your detailed bttv bug report: https://lore.kernel.org/linux-media/ZVK_3UmvmOaCv1tc@gallifrey/ It was very helpful and I managed to reproduce these issues. This patch series fixes them. The first patch is unrelated, just something I noticed while debugging this. The second patch adds back the old bttv behavior of storing the frame counter in the last 4 bytes of the vbi payload when using read(). The final patch fixes the vbi read() behavior where it was alternating between valid data and a zeroed buffer. I'd appreciate it if you can test this before Dec 11 since I plan to merge on Dec 11 if I don't hear anything. Regards, Hans Hans Verkuil (3): media: bttv: start_streaming should return a proper error code media: bttv: add back vbi hack media: videobuf2: request more buffers for vb2_read .../media/common/videobuf2/videobuf2-core.c | 9 +++++-- drivers/media/pci/bt8xx/bttv-driver.c | 27 ++++++++++++++++--- drivers/media/pci/bt8xx/bttv-vbi.c | 8 +++--- 3 files changed, 33 insertions(+), 11 deletions(-) -- 2.42.0
