drm/amd/display: Fix potential integer overflow
Fix potential integer overflow by casting actual_calculated_clock_100hz
to u64, in order to give the compiler complete information about the
proper arithmetic to use.
Notice that such variable is used in a context that expects
an expression of type u64 (64 bits, unsigned) and the following
expression is currently being evaluated using 32-bit arithmetic:
actual_calculated_clock_100hz * post_divider
Fixes: 7a03fdf628
("drm/amd/display: fix 64bit division issue on 32bit OS")
Addresses-Coverity-ID: 1501691 ("Unintentional integer overflow")
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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@ -240,7 +240,7 @@ static bool calc_fb_divider_checking_tolerance(
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pll_settings->calculated_pix_clk_100hz =
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actual_calculated_clock_100hz;
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pll_settings->vco_freq =
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div_u64(actual_calculated_clock_100hz * post_divider, 10);
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div_u64((u64)actual_calculated_clock_100hz * post_divider, 10);
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return true;
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}
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return false;
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