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staging: rtl8192u: fix a dubious looking mask before a shift

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[ Upstream commit c4283950a9a4d3bf4a3f362e406c80ab14f10714 ]

Currently the masking of ret with 0xff and followed by a right shift
of 8 bits always leaves a zero result.  It appears the mask of 0xff
is incorrect and should be 0xff00, but I don't have the hardware to
test this. Fix this to mask the upper 8 bits before shifting.

[ Not tested ]

Addresses-Coverity: ("Operands don't affect result")
Fixes: 8fc8598e61f6 ("Staging: Added Realtek rtl8192u driver to staging")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20200716154720.1710252-1-colin.king@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Colin Ian King 2020-07-16 16:47:20 +01:00 committed by Greg Kroah-Hartman
parent 346ad21602
commit 01af011f7f
1 changed files with 1 additions and 1 deletions
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2
drivers/staging/rtl8192u/r8192U_core.c
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@ -2522,7 +2522,7 @@ static int rtl8192_read_eeprom_info(struct net_device *dev)
ret = eprom_read(dev, (EEPROM_TxPwIndex_CCK >> 1));
if (ret < 0)
return ret;
priv->EEPROMTxPowerLevelCCK = ((u16)ret & 0xff) >> 8;
priv->EEPROMTxPowerLevelCCK = ((u16)ret & 0xff00) >> 8;
} else
priv->EEPROMTxPowerLevelCCK = 0x10;
RT_TRACE(COMP_EPROM, "CCK Tx Power Levl: 0x%02x\n", priv->EEPROMTxPowerLevelCCK);