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net: hisilicon: Fix usage of uninitialized variable in function mdio_sc_cfg_reg_write() 

In function mdio_sc_cfg_reg_write(), variable "reg_value" could be
uninitialized if regmap_read() fails. However, "reg_value" is used
to decide the control flow later in the if statement, which is
potentially unsafe.

Signed-off-by: Yizhuo <yzhai003@ucr.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
alistair/sunxi64-5.4-dsi
Yizhuo 2019-10-01 13:24:39 -07:00 committed by David S. Miller
parent 4fbb97bac1
commit 53de429f4e
1 changed files with 5 additions and 1 deletions
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6
drivers/net/ethernet/hisilicon/hns_mdio.c
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@ -148,11 +148,15 @@ static int mdio_sc_cfg_reg_write(struct hns_mdio_device *mdio_dev,
{
u32 time_cnt;
u32 reg_value;
int ret;
regmap_write(mdio_dev->subctrl_vbase, cfg_reg, set_val);
for (time_cnt = MDIO_TIMEOUT; time_cnt; time_cnt--) {
regmap_read(mdio_dev->subctrl_vbase, st_reg, &reg_value);
ret = regmap_read(mdio_dev->subctrl_vbase, st_reg, &reg_value);
if (ret)
return ret;
reg_value &= st_msk;
if ((!!check_st) == (!!reg_value))
break;