From 4d6168314d4c504c240087ac22d1acc01dad3299 Mon Sep 17 00:00:00 2001 From: Rui Feng Date: Wed, 20 Nov 2019 09:40:06 +0800 Subject: misc: rtsx: Fix impossible condition A u8 can only go up to 255, condition n > 396 is impossible, so change u8 to u16. Signed-off-by: Rui Feng Link: https://lore.kernel.org/r/1574214006-13540-1-git-send-email-rui_feng@realsil.com.cn Signed-off-by: Greg Kroah-Hartman --- drivers/misc/cardreader/rts5261.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) (limited to 'drivers/misc/cardreader') diff --git a/drivers/misc/cardreader/rts5261.c b/drivers/misc/cardreader/rts5261.c index 32dcec2e9dfd..bc4967a6efa1 100644 --- a/drivers/misc/cardreader/rts5261.c +++ b/drivers/misc/cardreader/rts5261.c @@ -628,7 +628,8 @@ int rts5261_pci_switch_clock(struct rtsx_pcr *pcr, unsigned int card_clock, u8 ssc_depth, bool initial_mode, bool double_clk, bool vpclk) { int err, clk; - u8 n, clk_divider, mcu_cnt, div; + u16 n; + u8 clk_divider, mcu_cnt, div; static const u8 depth[] = { [RTSX_SSC_DEPTH_4M] = RTS5261_SSC_DEPTH_4M, [RTSX_SSC_DEPTH_2M] = RTS5261_SSC_DEPTH_2M, @@ -661,13 +662,13 @@ int rts5261_pci_switch_clock(struct rtsx_pcr *pcr, unsigned int card_clock, return 0; if (pcr->ops->conv_clk_and_div_n) - n = (u8)pcr->ops->conv_clk_and_div_n(clk, CLK_TO_DIV_N); + n = pcr->ops->conv_clk_and_div_n(clk, CLK_TO_DIV_N); else - n = (u8)(clk - 4); + n = clk - 4; if ((clk <= 4) || (n > 396)) return -EINVAL; - mcu_cnt = (u8)(125/clk + 3); + mcu_cnt = 125/clk + 3; if (mcu_cnt > 15) mcu_cnt = 15; @@ -676,7 +677,7 @@ int rts5261_pci_switch_clock(struct rtsx_pcr *pcr, unsigned int card_clock, if (pcr->ops->conv_clk_and_div_n) { int dbl_clk = pcr->ops->conv_clk_and_div_n(n, DIV_N_TO_CLK) * 2; - n = (u8)pcr->ops->conv_clk_and_div_n(dbl_clk, + n = pcr->ops->conv_clk_and_div_n(dbl_clk, CLK_TO_DIV_N); } else { n = (n + 4) * 2 - 4; -- cgit v1.2.3