[PATCH v3] staging: rtl8192e: Fix comparison to NULL of variable rf_set_sens

Yogesh Hegde
2023-04-12T17:51:34Z

Functions _rtl92e_wx_get_sens and _rtl92e_wx_set_sens depend on the
function rf_set_sens, which is declared but never defined.
Hence calling this function will cause an oops.
Because there is no definition of the function priv->rf_set_sens
will always be NULL.

As a result _rtl92e_wx_set_sens and _rtl92e_wx_get_sens will always
return -1.

Hence,
* Removed function definition rf_set_sens
* Removed usage of variable priv->rf_set_sens
* Removed functions _rtl92e_wx_get_sens and _rtl92e_wx_set_sens
* Cleaned up the variables sens and max_sens used in these functions

Suggested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>

Signed-off-by: Yogesh Hegde <yogi.kernel@gmail.com>
---
Changed in v3:
- Fixed description to fit within 75 chars
- Added suggested tags

as Suggested by: Philipp Hortmann <philipp.g.hortmann@gmail.com>

Changed in v2:
- Removed function definition rf_set_sens
- Removed usage of variable priv->rf_set_sens
- Removed functions _rtl92e_wx_get_sens and _rtl92e_wx_set_sens
- Cleaned up the variables sens and max_sens used in these functions
---
drivers/staging/rtl8192e/rtl8192e/rtl_core.h | 3 --
drivers/staging/rtl8192e/rtl8192e/rtl_wx.c | 45 --------------------
2 files changed, 48 deletions(-)

diff --git a/drivers/staging/rtl8192e/rtl8192e/rtl_core.h b/drivers/staging/rtl8192e/rtl8192e/rtl_core.h
index 2b2d8af4cf6e..a949a3833cca 100644
--- a/drivers/staging/rtl8192e/rtl8192e/rtl_core.h
+++ b/drivers/staging/rtl8192e/rtl8192e/rtl_core.h
@@ -234,7 +234,6 @@ struct r8192_priv {
struct rt_stats stats;
struct iw_statistics wstats;

- short (*rf_set_sens)(struct net_device *dev, short sens);
u8 (*rf_set_chan)(struct net_device *dev, u8 ch);

struct rx_desc *rx_ring[MAX_RX_QUEUE];
@@ -274,8 +273,6 @@ struct r8192_priv {
short promisc;

short chan;
- short sens;
- short max_sens;
bool ps_force;

u32 irq_mask[2];
diff --git a/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c b/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c
index cb28288a618b..0bb657fda06c 100644
--- a/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c
+++ b/drivers/staging/rtl8192e/rtl8192e/rtl_wx.c
@@ -311,10 +311,6 @@ static int _rtl92e_wx_get_range(struct net_device *dev,
/* ~130 Mb/s real (802.11n) */
range->throughput = 130 * 1000 * 1000;

- if (priv->rf_set_sens != NULL)
- /* signal level threshold range */
- range->sensitivity = priv->max_sens;
-
range->max_qual.qual = 100;
range->max_qual.level = 0;
range->max_qual.noise = 0;
@@ -807,45 +803,6 @@ static int _rtl92e_wx_get_retry(struct net_device *dev,
return 0;
}

-static int _rtl92e_wx_get_sens(struct net_device *dev,
- struct iw_request_info *info,
- union iwreq_data *wrqu, char *extra)
-{
- struct r8192_priv *priv = rtllib_priv(dev);
-
- if (priv->rf_set_sens == NULL)
- return -1; /* we have not this support for this radio */
- wrqu->sens.value = priv->sens;
- return 0;
-}
-
-static int _rtl92e_wx_set_sens(struct net_device *dev,
- struct iw_request_info *info,
- union iwreq_data *wrqu, char *extra)
-{
- struct r8192_priv *priv = rtllib_priv(dev);
-
- short err = 0;
-
- if (priv->hw_radio_off)
- return 0;
-
- mutex_lock(&priv->wx_mutex);
- if (priv->rf_set_sens == NULL) {
- err = -1; /* we have not this support for this radio */
- goto exit;
- }
- if (priv->rf_set_sens(dev, wrqu->sens.value) == 0)
- priv->sens = wrqu->sens.value;
- else
- err = -EINVAL;
-
-exit:
- mutex_unlock(&priv->wx_mutex);
-
- return err;
-}
-
static int _rtl92e_wx_set_encode_ext(struct net_device *dev,
struct iw_request_info *info,
union iwreq_data *wrqu, char *extra)
@@ -1066,8 +1023,6 @@ static iw_handler r8192_wx_handlers[] = {
[IW_IOCTL(SIOCGIWFREQ)] = _rtl92e_wx_get_freq,
[IW_IOCTL(SIOCSIWMODE)] = _rtl92e_wx_set_mode,
[IW_IOCTL(SIOCGIWMODE)] = _rtl92e_wx_get_mode,
- [IW_IOCTL(SIOCSIWSENS)] = _rtl92e_wx_set_sens,
- [IW_IOCTL(SIOCGIWSENS)] = _rtl92e_wx_get_sens,
[IW_IOCTL(SIOCGIWRANGE)] = _rtl92e_wx_get_range,
[IW_IOCTL(SIOCSIWAP)] = _rtl92e_wx_set_wap,
[IW_IOCTL(SIOCGIWAP)] = _rtl92e_wx_get_wap,
--
2.34.1