[PATCH v3] misc: rtsx: Fix impossible condition

From: rui_feng
Date: Tue Nov 19 2019 - 20:44:43 EST


From: Rui Feng <rui_feng@xxxxxxxxxxxxxx>

A u8 can only go up to 255, condition n > 396 is
impossible, so change u8 to u16.

Signed-off-by: Rui Feng <rui_feng@xxxxxxxxxxxxxx>
---
v3:remove useless cast.

drivers/misc/cardreader/rts5261.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/misc/cardreader/rts5261.c b/drivers/misc/cardreader/rts5261.c
index 32dcec2..bc4967a 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;
--
1.9.1