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| author | Jonathan Neuschäfer <j.neuschaefer@gmx.net> | 2017-04-07 22:02:29 +0200 |
|---|---|---|
| committer | Sean Paul <seanpaul@chromium.org> | 2017-04-11 09:21:30 -0400 |
| commit | 0c45b36f8acc89cb94c8696a27574f01e0e411dc (patch) | |
| tree | 052fb562e5b323531b356aa2ec2cf61934262e9d /drivers | |
| parent | a71c9a1c779f2499fb2afc0553e543f18aff6edf (diff) | |
| download | linux-0c45b36f8acc89cb94c8696a27574f01e0e411dc.tar.bz2 | |
drm/udl: Fix unaligned memory access in udl_render_hline
On SPARC, the udl driver filled my kernel log with these messages:
[186668.910612] Kernel unaligned access at TPC[76609c] udl_render_hline+0x13c/0x3a0
Use put_unaligned_be16 to avoid them. On x86 this results in the same
code, but on SPARC the compiler emits two single-byte stores.
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Acked-by: David Airlie <airlied@linux.ie>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170407200229.20642-1-j.neuschaefer@gmx.net
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/udl/udl_transfer.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/udl/udl_transfer.c b/drivers/gpu/drm/udl/udl_transfer.c index 917dcb978c2c..0c87b1ac6b68 100644 --- a/drivers/gpu/drm/udl/udl_transfer.c +++ b/drivers/gpu/drm/udl/udl_transfer.c @@ -14,6 +14,7 @@ #include <linux/slab.h> #include <linux/fb.h> #include <linux/prefetch.h> +#include <asm/unaligned.h> #include <drm/drmP.h> #include "udl_drv.h" @@ -163,7 +164,7 @@ static void udl_compress_hline16( const u8 *const start = pixel; const uint16_t repeating_pixel_val16 = pixel_val16; - *(uint16_t *)cmd = cpu_to_be16(pixel_val16); + put_unaligned_be16(pixel_val16, cmd); cmd += 2; pixel += bpp; |