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| author | Yifeng Li <tomli@tomli.me> | 2019-04-02 17:14:10 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-25 18:26:58 +0200 |
| commit | 9adc440e305126c1555e84bde38249b0d1437c39 (patch) | |
| tree | 90414b7e39b82f7d69b9924309f60bdd0253f940 /drivers/video | |
| parent | 038ec2c13e0d1f7b9d45a081786f18f75b65f11b (diff) | |
| download | linux-stable-9adc440e305126c1555e84bde38249b0d1437c39.tar.gz linux-stable-9adc440e305126c1555e84bde38249b0d1437c39.tar.bz2 linux-stable-9adc440e305126c1555e84bde38249b0d1437c39.zip | |
fbdev: sm712fb: fix memory frequency by avoiding a switch/case fallthrough
commit 9dc20113988b9a75ea6b3abd68dc45e2d73ccdab upstream.
A fallthrough in switch/case was introduced in f627caf55b8e ("fbdev:
sm712fb: fix crashes and garbled display during DPMS modesetting"),
due to my copy-paste error, which would cause the memory clock frequency
for SM720 to be programmed to SM712.
Since it only reprograms the clock to a different frequency, it's only
a benign issue without visible side-effect, so it also evaded Sudip
Mukherjee's code review and regression tests. scripts/checkpatch.pl
also failed to discover the issue, possibly due to nested switch
statements.
This issue was found by Stephen Rothwell by building linux-next with
-Wimplicit-fallthrough.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Fixes: f627caf55b8e ("fbdev: sm712fb: fix crashes and garbled display during DPMS modesetting")
Signed-off-by: Yifeng Li <tomli@tomli.me>
Cc: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/fbdev/sm712fb.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/video/fbdev/sm712fb.c b/drivers/video/fbdev/sm712fb.c index e2478fa4faec..0d92ff366a7b 100644 --- a/drivers/video/fbdev/sm712fb.c +++ b/drivers/video/fbdev/sm712fb.c @@ -898,6 +898,7 @@ static int smtc_blank(int blank_mode, struct fb_info *info) case 0x712: smtc_seqw(0x6a, 0x16); smtc_seqw(0x6b, 0x02); + break; case 0x720: smtc_seqw(0x6a, 0x0d); smtc_seqw(0x6b, 0x02); |