lkml.org 
[lkml]   [2019]   [Jun]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.4 153/241] b43: shut up clang -Wuninitialized variable warning
Date
[ Upstream commit d825db346270dbceef83b7b750dbc29f1d7dcc0e ]

Clang warns about what is clearly a case of passing an uninitalized
variable into a static function:

drivers/net/wireless/broadcom/b43/phy_lp.c:1852:23: error: variable 'gains' is uninitialized when used here
[-Werror,-Wuninitialized]
lpphy_papd_cal(dev, gains, 0, 1, 30);
^~~~~
drivers/net/wireless/broadcom/b43/phy_lp.c:1838:2: note: variable 'gains' is declared here
struct lpphy_tx_gains gains, oldgains;
^
1 error generated.

However, this function is empty, and its arguments are never evaluated,
so gcc in contrast does not warn here. Both compilers behave in a
reasonable way as far as I can tell, so we should change the code
to avoid the warning everywhere.

We could just eliminate the lpphy_papd_cal() function entirely,
given that it has had the TODO comment in it for 10 years now
and is rather unlikely to ever get done. I'm doing a simpler
change here, and just pass the 'oldgains' variable in that has
been initialized, based on the guess that this is what was
originally meant.

Fixes: 2c0d6100da3e ("b43: LP-PHY: Begin implementing calibration & software RFKILL support")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/b43/phy_lp.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/b43/phy_lp.c b/drivers/net/wireless/b43/phy_lp.c
index 058a9f2320503..55cb07693ae80 100644
--- a/drivers/net/wireless/b43/phy_lp.c
+++ b/drivers/net/wireless/b43/phy_lp.c
@@ -1834,7 +1834,7 @@ static void lpphy_papd_cal(struct b43_wldev *dev, struct lpphy_tx_gains gains,
static void lpphy_papd_cal_txpwr(struct b43_wldev *dev)
{
struct b43_phy_lp *lpphy = dev->phy.lp;
- struct lpphy_tx_gains gains, oldgains;
+ struct lpphy_tx_gains oldgains;
int old_txpctl, old_afe_ovr, old_rf, old_bbmult;

lpphy_read_tx_pctl_mode_from_hardware(dev);
@@ -1848,9 +1848,9 @@ static void lpphy_papd_cal_txpwr(struct b43_wldev *dev)
lpphy_set_tx_power_control(dev, B43_LPPHY_TXPCTL_OFF);

if (dev->dev->chip_id == 0x4325 && dev->dev->chip_rev == 0)
- lpphy_papd_cal(dev, gains, 0, 1, 30);
+ lpphy_papd_cal(dev, oldgains, 0, 1, 30);
else
- lpphy_papd_cal(dev, gains, 0, 1, 65);
+ lpphy_papd_cal(dev, oldgains, 0, 1, 65);

if (old_afe_ovr)
lpphy_set_tx_gains(dev, oldgains);
--
2.20.1


\
 
 \ /
  Last update: 2019-06-09 19:11    [W:0.545 / U:6.868 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site