[PATCH v2 0/7] Fix -Wunused-but-set-variable in mwifiex/

[PATCH v2 0/7] Fix -Wunused-but-set-variable in mwifiex/

[Kirtika Ruchandani]

This patchset is part of the effort led by Arnd Bergmann to clean up
warnings in the kernel. This and following patchsets will focus on
"-Wunused-but-set-variable" as it among the noisier ones. These were
found compiling with W=1.

Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Kirtika Ruchandani <kirtika@google.com>

---
Changes in v2:
- Reapplied patches on top of wireless-drivers-next.
- Patch 5/7 ("mwifiex: Remove unused 'pm_flag' variable") had to be 
  redone slightly. The others applied cleanly with 'patch -p1'.

Kirtika Ruchandani (7):
  mwifiex: Removed unused mwifiex_private* 'priv' variable
  mwifiex: Remove unused  'chan_num' variable
  mwifiex: Remove unused 'sta_ptr' variable
  mwifiex: Remove unused 'adapter'variable
  mwifiex: Remove unused 'pm_flag' variable
  mwifiex: Removed unused 'pkt_type' variable
  mwifiex: Remove unused 'bcd_usb' variable

 drivers/net/wireless/marvell/mwifiex/cfg80211.c | 2 --
 drivers/net/wireless/marvell/mwifiex/main.c     | 3 ---
 drivers/net/wireless/marvell/mwifiex/scan.c     | 8 +++-----
 drivers/net/wireless/marvell/mwifiex/sdio.c     | 5 -----
 drivers/net/wireless/marvell/mwifiex/sta_cmd.c  | 2 --
 drivers/net/wireless/marvell/mwifiex/usb.c      | 3 +--
 6 files changed, 4 insertions(+), 19 deletions(-)

-- 
2.8.0.rc3.226.g39d4020

[PATCH v2 1/7] mwifiex: Removed unused mwifiex_private* 'priv' variable

[Kirtika Ruchandani]

Commit bec568ff5107 removed the last remaining usage of struct
mwifiex_private* priv in mwifiex_fw_dpc(), by removing the call to
mwifiex_del_virtual_intf().
Compiling mwifiex/ with W=1 gives the following warning, fix it.
mwifiex/main.c: In function ‘mwifiex_fw_dpc’:
mwifiex/main.c:520:26: warning: variable ‘priv’ set but not used [-Wunused-but-set-variable]

Fixes: bec568ff5107 ("mwifiex: failure path handling in mwifiex_add_virtual_intf()")
Cc: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kirtika Ruchandani <kirtika@google.com>
---
 drivers/net/wireless/marvell/mwifiex/main.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/main.c b/drivers/net/wireless/marvell/mwifiex/main.c
index eac44fe..e5c3a8a 100644
--- a/drivers/net/wireless/marvell/mwifiex/main.c
+++ b/drivers/net/wireless/marvell/mwifiex/main.c
@@ -518,7 +518,6 @@ static void mwifiex_fw_dpc(const struct firmware *firmware, void *context)
 {
 	int ret;
 	char fmt[64];
-	struct mwifiex_private *priv;
 	struct mwifiex_adapter *adapter = context;
 	struct mwifiex_fw_image fw;
 	bool init_failed = false;
@@ -576,8 +575,6 @@ static void mwifiex_fw_dpc(const struct firmware *firmware, void *context)
 			goto err_init_fw;
 	}
 
-	priv = adapter->priv[MWIFIEX_BSS_ROLE_STA];
-
 	if (!adapter->wiphy) {
 		if (mwifiex_register_cfg80211(adapter)) {
 			mwifiex_dbg(adapter, ERROR,
-- 
2.8.0.rc3.226.g39d4020

[PATCH v2 2/7] mwifiex: Remove unused 'chan_num' variable

[Kirtika Ruchandani]

Commit b5413e6b2228 removed all uses of chan_num in mwifiex_config_scan().
Compiling mwifiex with W=1 gives the following warning, fix it.

mwifiex/scan.c: In function ‘mwifiex_config_scan’:
mwifiex/scan.c:830:6: warning: variable ‘chan_num’ set but not used [-Wunused-but-set-variable]

Fixes: b5413e6b2228 ("mwifiex: increase the number of nodes in command pool")
Cc: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kirtika Ruchandani <kirtika@google.com>
---
 drivers/net/wireless/marvell/mwifiex/scan.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/scan.c b/drivers/net/wireless/marvell/mwifiex/scan.c
index 98ce072..1816916 100644
--- a/drivers/net/wireless/marvell/mwifiex/scan.c
+++ b/drivers/net/wireless/marvell/mwifiex/scan.c
@@ -827,7 +827,6 @@ mwifiex_config_scan(struct mwifiex_private *priv,
 	u32 num_probes;
 	u32 ssid_len;
 	u32 chan_idx;
-	u32 chan_num;
 	u32 scan_type;
 	u16 scan_dur;
 	u8 channel;
@@ -1105,13 +1104,12 @@ mwifiex_config_scan(struct mwifiex_private *priv,
 			mwifiex_dbg(adapter, INFO,
 				    "info: Scan: Scanning current channel only\n");
 		}
-		chan_num = chan_idx;
 	} else {
 		mwifiex_dbg(adapter, INFO,
 			    "info: Scan: Creating full region channel list\n");
-		chan_num = mwifiex_scan_create_channel_list(priv, user_scan_in,
-							    scan_chan_list,
-							    *filtered_scan);
+		mwifiex_scan_create_channel_list(priv, user_scan_in,
+						 scan_chan_list,
+						 *filtered_scan);
 	}
 
 }
-- 
2.8.0.rc3.226.g39d4020

[PATCH v2 3/7] mwifiex: Remove unused 'sta_ptr' variable

[Kirtika Ruchandani]

Commit 429d90d2212b introduced mwifiex_cmd_tdls_oper() which initializes
struct mwifiex_sta_node* sta_ptr, but does not use it. Compiling with W=1 gives
the following warning, fix it.
mwifiex/sta_cmd.c: In function ‘mwifiex_cmd_tdls_oper’:
mwifiex/sta_cmd.c:1732:27: warning: variable ‘sta_ptr’ set but not used [-Wunused-but-set-variable]

Fixes: 429d90d2212b ("mwifiex: add cfg80211 tdls_oper handler support")
Cc: Avinash Patil <patila@marvell.com>
Signed-off-by: Kirtika Ruchandani <kirtika@google.com>
---
 drivers/net/wireless/marvell/mwifiex/sta_cmd.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/sta_cmd.c b/drivers/net/wireless/marvell/mwifiex/sta_cmd.c
index bcd6408..768c519 100644
--- a/drivers/net/wireless/marvell/mwifiex/sta_cmd.c
+++ b/drivers/net/wireless/marvell/mwifiex/sta_cmd.c
@@ -1746,7 +1746,6 @@ mwifiex_cmd_tdls_oper(struct mwifiex_private *priv,
 {
 	struct host_cmd_ds_tdls_oper *tdls_oper = &cmd->params.tdls_oper;
 	struct mwifiex_ds_tdls_oper *oper = data_buf;
-	struct mwifiex_sta_node *sta_ptr;
 	struct host_cmd_tlv_rates *tlv_rates;
 	struct mwifiex_ie_types_htcap *ht_capab;
 	struct mwifiex_ie_types_qos_info *wmm_qos_info;
@@ -1764,7 +1763,6 @@ mwifiex_cmd_tdls_oper(struct mwifiex_private *priv,
 
 	tdls_oper->reason = 0;
 	memcpy(tdls_oper->peer_mac, oper->peer_mac, ETH_ALEN);
-	sta_ptr = mwifiex_get_sta_entry(priv, oper->peer_mac);
 
 	pos = (u8 *)tdls_oper + sizeof(struct host_cmd_ds_tdls_oper);
 
-- 
2.8.0.rc3.226.g39d4020

[PATCH v2 4/7] mwifiex: Remove unused 'adapter'variable

[Kirtika Ruchandani]

Commit 3935ccc14d2c introduced mwifiex_tm_cmd() which initializes
struct mwifiex_adapter* adapter, but doesn't use it.
Compiling with W=1 gives the following warning, fix it.
mwifiex/cfg80211.c: In function ‘mwifiex_tm_cmd’:
mwifiex/cfg80211.c:3973:26: warning: variable ‘adapter’ set but not used [-Wunused-but-set-variable]

Fixes: 3935ccc14d2c ("mwifiex: add cfg80211 testmode support")
Cc: Xinming Hu <huxm@marvell.com>
Cc: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kirtika Ruchandani <kirtika@google.com>
---
 drivers/net/wireless/marvell/mwifiex/cfg80211.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/cfg80211.c b/drivers/net/wireless/marvell/mwifiex/cfg80211.c
index c26469a..a231f09 100644
--- a/drivers/net/wireless/marvell/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/marvell/mwifiex/cfg80211.c
@@ -3980,13 +3980,11 @@ static int mwifiex_tm_cmd(struct wiphy *wiphy, struct wireless_dev *wdev,
 	struct mwifiex_private *priv = mwifiex_netdev_get_priv(wdev->netdev);
 	struct mwifiex_ds_misc_cmd *hostcmd;
 	struct nlattr *tb[MWIFIEX_TM_ATTR_MAX + 1];
-	struct mwifiex_adapter *adapter;
 	struct sk_buff *skb;
 	int err;
 
 	if (!priv)
 		return -EINVAL;
-	adapter = priv->adapter;
 
 	err = nla_parse(tb, MWIFIEX_TM_ATTR_MAX, data, len,
 			mwifiex_tm_policy);
-- 
2.8.0.rc3.226.g39d4020

[PATCH v2 5/7] mwifiex: Remove unused 'pm_flag' variable

[Kirtika Ruchandani]

mwifiex_sdio_resume() intializes pm_flag, just like
mwifiex_sdio_suspend(), but does not use it. Compiling with W=1 gives
the following warning, fix it.
mwifiex/sdio.c: In function ‘mwifiex_sdio_resume’:
mwifiex/sdio.c:234:16: warning: variable ‘pm_flag’ set but not used [-Wunused-but-set-variable]

sdio_get_host_pm_caps() is just an acessor, so the call to it is safe
to remove. The unused variable seems to be present since
5e6e3a92b9a4 which introduced mwifiex_sdio_resume().

Fixes: 5e6e3a92b9a4 ("wireless: mwifiex: initial commit for Marvell mwifiex driver")
Cc: Bing Zhao <bzhao@marvell.com>
Cc: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kirtika Ruchandani <kirtika@google.com>
---
 drivers/net/wireless/marvell/mwifiex/sdio.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/sdio.c b/drivers/net/wireless/marvell/mwifiex/sdio.c
index 0d00db5..6c9f16e 100644
--- a/drivers/net/wireless/marvell/mwifiex/sdio.c
+++ b/drivers/net/wireless/marvell/mwifiex/sdio.c
@@ -186,9 +186,7 @@ static int mwifiex_sdio_resume(struct device *dev)
 	struct sdio_func *func = dev_to_sdio_func(dev);
 	struct sdio_mmc_card *card;
 	struct mwifiex_adapter *adapter;
-	mmc_pm_flag_t pm_flag = 0;
 
-	pm_flag = sdio_get_host_pm_caps(func);
 	card = sdio_get_drvdata(func);
 	if (!card || !card->adapter) {
 		dev_err(dev, "resume: invalid card or adapter\n");
-- 
2.8.0.rc3.226.g39d4020

[PATCH v2 6/7] mwifiex: Removed unused 'pkt_type' variable

[Kirtika Ruchandani]

Commit 92263a841b15 introduced mwifiex_deaggr_sdio_pkt which initializes
variable pkt_type but does not use it. Compiling with W=1 gives the following
warning, fix it.
mwifiex/sdio.c: In function ‘mwifiex_deaggr_sdio_pkt’:
mwifiex/sdio.c:1198:6: warning: variable ‘pkt_type’ set but not used [-Wunused-but-set-variable]

Fixes: 92263a841b15 ("mwifiex: add SDIO rx single port aggregation")
Cc: Zhaoyang Liu <liuzy@marvell.com>
Cc: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kirtika Ruchandani <kirtika@google.com>
---
 drivers/net/wireless/marvell/mwifiex/sdio.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/sdio.c b/drivers/net/wireless/marvell/mwifiex/sdio.c
index 6c9f16e..09c586f 100644
--- a/drivers/net/wireless/marvell/mwifiex/sdio.c
+++ b/drivers/net/wireless/marvell/mwifiex/sdio.c
@@ -1134,7 +1134,6 @@ static void mwifiex_deaggr_sdio_pkt(struct mwifiex_adapter *adapter,
 {
 	u32 total_pkt_len, pkt_len;
 	struct sk_buff *skb_deaggr;
-	u32 pkt_type;
 	u16 blk_size;
 	u8 blk_num;
 	u8 *data;
@@ -1155,8 +1154,6 @@ static void mwifiex_deaggr_sdio_pkt(struct mwifiex_adapter *adapter,
 			break;
 		}
 		pkt_len = le16_to_cpu(*(__le16 *)(data + SDIO_HEADER_OFFSET));
-		pkt_type = le16_to_cpu(*(__le16 *)(data + SDIO_HEADER_OFFSET +
-					 2));
 		if ((pkt_len + SDIO_HEADER_OFFSET) > blk_size) {
 			mwifiex_dbg(adapter, ERROR,
 				    "%s: error in pkt_len,\t"
-- 
2.8.0.rc3.226.g39d4020

[PATCH v2 7/7] mwifiex: Remove unused 'bcd_usb' variable

[Kirtika Ruchandani]

mwifiex_usb_probe() defines and sets bcd_usb but does not use it,
Compiling with W=1 gives the following warning, fix it.
mwifiex/usb.c: In function ‘mwifiex_usb_probe’:
mwifiex/usb.c:383:41: warning: variable ‘bcd_usb’ set but not used [-Wunused-but-set-variable]

The unused variable seems to be present since 4daffe354366 which introduced
mwifiex_usb_probe().

Fixes: 4daffe354366 ("mwifiex: add support for Marvell USB8797 chipset")
Cc: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kirtika Ruchandani <kirtika@google.com>
---
 drivers/net/wireless/marvell/mwifiex/usb.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/wireless/marvell/mwifiex/usb.c b/drivers/net/wireless/marvell/mwifiex/usb.c
index c3f696a..c563160 100644
--- a/drivers/net/wireless/marvell/mwifiex/usb.c
+++ b/drivers/net/wireless/marvell/mwifiex/usb.c
@@ -379,7 +379,7 @@ static int mwifiex_usb_probe(struct usb_interface *intf,
 	struct usb_endpoint_descriptor *epd;
 	int ret, i;
 	struct usb_card_rec *card;
-	u16 id_vendor, id_product, bcd_device, bcd_usb;
+	u16 id_vendor, id_product, bcd_device;
 
 	card = devm_kzalloc(&intf->dev, sizeof(*card), GFP_KERNEL);
 	if (!card)
@@ -390,7 +390,6 @@ static int mwifiex_usb_probe(struct usb_interface *intf,
 	id_vendor = le16_to_cpu(udev->descriptor.idVendor);
 	id_product = le16_to_cpu(udev->descriptor.idProduct);
 	bcd_device = le16_to_cpu(udev->descriptor.bcdDevice);
-	bcd_usb = le16_to_cpu(udev->descriptor.bcdUSB);
 	pr_debug("info: VID/PID = %X/%X, Boot2 version = %X\n",
 		 id_vendor, id_product, bcd_device);
 
-- 
2.8.0.rc3.226.g39d4020

RE: [PATCH v2 0/7] Fix -Wunused-but-set-variable in mwifiex/

[Amitkumar Karwar]

> From: Kirtika Ruchandani [mailto:kirtika.ruchandani@gmail.com]
> Sent: Thursday, November 24, 2016 6:54 AM
> To: Amitkumar Karwar
> Cc: Arnd Bergmann; Kalle Valo; linux-wireless@vger.kernel.org; Nishant
> Sarmukadam; Zhaoyang Liu; Bing Zhao; Xinming Hu; Avinash Patil
> Subject: [PATCH v2 0/7] Fix -Wunused-but-set-variable in mwifiex/
> 
> This patchset is part of the effort led by Arnd Bergmann to clean up
> warnings in the kernel. This and following patchsets will focus on "-
> Wunused-but-set-variable" as it among the noisier ones. These were
> found compiling with W=1.
> 
> Acked-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Kirtika Ruchandani <kirtika@google.com>
> 
> ---
> Changes in v2:
> - Reapplied patches on top of wireless-drivers-next.
> - Patch 5/7 ("mwifiex: Remove unused 'pm_flag' variable") had to be
>   redone slightly. The others applied cleanly with 'patch -p1'.
> 
> Kirtika Ruchandani (7):
>   mwifiex: Removed unused mwifiex_private* 'priv' variable
>   mwifiex: Remove unused  'chan_num' variable
>   mwifiex: Remove unused 'sta_ptr' variable
>   mwifiex: Remove unused 'adapter'variable
>   mwifiex: Remove unused 'pm_flag' variable
>   mwifiex: Removed unused 'pkt_type' variable
>   mwifiex: Remove unused 'bcd_usb' variable
> 
>  drivers/net/wireless/marvell/mwifiex/cfg80211.c | 2 --
>  drivers/net/wireless/marvell/mwifiex/main.c     | 3 ---
>  drivers/net/wireless/marvell/mwifiex/scan.c     | 8 +++-----
>  drivers/net/wireless/marvell/mwifiex/sdio.c     | 5 -----
>  drivers/net/wireless/marvell/mwifiex/sta_cmd.c  | 2 --
>  drivers/net/wireless/marvell/mwifiex/usb.c      | 3 +--
>  6 files changed, 4 insertions(+), 19 deletions(-)
> 
> --

Thanks for this cleanup work.
Patch series looks fine to me.

Acked-by: Amitkumar Karwar <akarwar@marvell.com>

Regards,
Amitkumar

Re: [v2, 1/7] mwifiex: Removed unused mwifiex_private* 'priv' variable

[Kalle Valo]

Kirtika Ruchandani <kirtika.ruchandani@gmail.com> wrote:
> Commit bec568ff5107 removed the last remaining usage of struct
> mwifiex_private* priv in mwifiex_fw_dpc(), by removing the call to
> mwifiex_del_virtual_intf().
> Compiling mwifiex/ with W=1 gives the following warning, fix it.
> mwifiex/main.c: In function ‘mwifiex_fw_dpc’:
> mwifiex/main.c:520:26: warning: variable ‘priv’ set but not used [-Wunused-but-set-variable]
> 
> Fixes: bec568ff5107 ("mwifiex: failure path handling in mwifiex_add_virtual_intf()")
> Cc: Amitkumar Karwar <akarwar@marvell.com>
> Signed-off-by: Kirtika Ruchandani <kirtika@google.com>

7 patches applied to wireless-drivers-next.git, thanks.

70d740598713 mwifiex: Removed unused mwifiex_private* 'priv' variable
8ac9134161d9 mwifiex: Remove unused 'chan_num' variable
2c2bcabf02e1 mwifiex: Remove unused 'sta_ptr' variable
60261b266a84 mwifiex: Remove unused 'adapter'variable
e9f1db8b6859 mwifiex: Remove unused 'pm_flag' variable
67dd2a754906 mwifiex: Removed unused 'pkt_type' variable
4133828c76c3 mwifiex: Remove unused 'bcd_usb' variable

-- 
https://patchwork.kernel.org/patch/9444651/

Documentation about submitting wireless patches and checking status
from patchwork:

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches