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| author | Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> | 2018-04-13 15:44:16 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2018-04-16 15:52:44 +0100 |
| commit | 10b4640833e95eeacaef8060bc1b35e636df3218 (patch) | |
| tree | 871fc87eaf41e850492d2734bd48f923b036726a /tools/perf/scripts | |
| parent | spi: imx: Update MODULE_DESCRIPTION to "SPI Controller driver" (diff) | |
| download | linux-10b4640833e95eeacaef8060bc1b35e636df3218.tar.gz linux-10b4640833e95eeacaef8060bc1b35e636df3218.zip | |
spi: sh-msiof: Fix bit field overflow writes to TSCR/RSCR
The change fixes a bit field overflow which allows to write to higher
bits while calculating SPI transfer clock and setting BRPS and BRDV
bit fields, the problem is reproduced if 'parent_rate' to 'spi_hz'
ratio is greater than 1024, for instance
p->min_div = 2,
MSO rate = 33333333,
SPI device rate = 10000
results in
k = 5, i.e. BRDV = 0b100 or 1/32 prescaler output,
BRPS = 105,
TSCR value = 0x6804, thus MSSEL and MSIMM bit fields are non-zero.
Fixes: 65d5665bb260 ("spi: sh-msiof: Update calculation of frequency dividing")
Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'tools/perf/scripts')
0 files changed, 0 insertions, 0 deletions