From 1c9f47195ef83ffd59ff665f2006789c0610cff0 Mon Sep 17 00:00:00 2001 From: Ezequiel Garcia Date: Fri, 1 Apr 2016 19:38:21 -0300 Subject: [PATCH] [media] tw686x: Specify that the DMA is 32 bits Set vb2_queue.gfp_flags to GFP_DMA32. Otherwise it will start to create bounce buffers which is something you want to avoid since those are in limited supply. Without this patch, DMA scatter-gather may not work because machines can ran out of buffers easily. Signed-off-by: Ezequiel Garcia Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/pci/tw686x/tw686x-video.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/media/pci/tw686x/tw686x-video.c b/drivers/media/pci/tw686x/tw686x-video.c index 2356fa2..118e9fa 100644 --- a/drivers/media/pci/tw686x/tw686x-video.c +++ b/drivers/media/pci/tw686x/tw686x-video.c @@ -848,6 +848,7 @@ int tw686x_video_init(struct tw686x_dev *dev) vc->vidq.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC; vc->vidq.min_buffers_needed = 2; vc->vidq.lock = &vc->vb_mutex; + vc->vidq.gfp_flags = GFP_DMA32; err = vb2_queue_init(&vc->vidq); if (err) { -- 2.7.4