This is a note to let you know that I've just added the patch titled
media: venus: helpers: Fix ALIGN() of non power of two
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
media-venus-helpers-fix-align-of-non-power-of-two.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b097b170b34945fffdfba39be6f1987ca89a12d7
Author: Rikard Falkeborn <rikard.falkeborn@xxxxxxxxx>
Date: Sat Sep 12 20:03:01 2020 +0100
media: venus: helpers: Fix ALIGN() of non power of two
[ Upstream commit 927e78ac8bc58155316cf6f46026e1912bbbbcfc ]
ALIGN() expects its second argument to be a power of 2, otherwise
incorrect results are produced for some inputs. The output can be
both larger or smaller than what is expected.
For example, ALIGN(304, 192) equals 320 instead of 384, and
ALIGN(65, 192) equals 256 instead of 192.
However, nestling two ALIGN() as is done in this case seem to only
produce results equal to or bigger than the expected result if ALIGN()
had handled non powers of two, and that in turn results in framesizes
that are either the correct size or too large.
Fortunately, since 192 * 4 / 3 equals 256, it turns out that one ALIGN()
is sufficient.
Fixes: ab1eda449c6e ("media: venus: vdec: handle 10bit bitstreams")
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@xxxxxxxxx>
Signed-off-by: Stanimir Varbanov <stanimir.k.varbanov@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/media/platform/qcom/venus/helpers.c b/drivers/media/platform/qcom/venus/helpers.c
index 8012f5c7bf344..ff705d513aae4 100644
--- a/drivers/media/platform/qcom/venus/helpers.c
+++ b/drivers/media/platform/qcom/venus/helpers.c
@@ -981,8 +981,8 @@ static u32 get_framesize_raw_yuv420_tp10_ubwc(u32 width, u32 height)
u32 extradata = SZ_16K;
u32 size;
- y_stride = ALIGN(ALIGN(width, 192) * 4 / 3, 256);
- uv_stride = ALIGN(ALIGN(width, 192) * 4 / 3, 256);
+ y_stride = ALIGN(width * 4 / 3, 256);
+ uv_stride = ALIGN(width * 4 / 3, 256);
y_sclines = ALIGN(height, 16);
uv_sclines = ALIGN((height + 1) >> 1, 16);
