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SubjectRe: [PATCH] staging: wlan-ng: Amend type mismatch warnings
On Mon, Jun 12, 2017 at 7:15 PM,  <sunil.m@techveda.org> wrote:
> From: Suniel Mahesh <sunil.m@techveda.org>
>
> The following type mismatch warnings reported by sparse
> have been amended:
> warning: cast to restricted __le16
> warning: incorrect type in assignment (different base types)

Why not change the type of the struct fields to __le16 where they
would need to be __le16 (thereby documenting the requirement)? This is
just telling the compiler to shut up, not necessarily fixing the issue
that it's flagging.

Cheers,
Frans


>
> Signed-off-by: Suniel Mahesh <sunil.m@techveda.org>
> ---
> drivers/staging/wlan-ng/prism2mgmt.c | 22 +++++++++++-----------
> 1 file changed, 11 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/staging/wlan-ng/prism2mgmt.c b/drivers/staging/wlan-ng/prism2mgmt.c
> index f4d6e48..358b556 100644
> --- a/drivers/staging/wlan-ng/prism2mgmt.c
> +++ b/drivers/staging/wlan-ng/prism2mgmt.c
> @@ -185,7 +185,7 @@ int prism2mgmt_scan(struct wlandevice *wlandev, void *msgp)
>
> /* set up the txrate to be 2MBPS. Should be fastest basicrate... */
> word = HFA384x_RATEBIT_2;
> - scanreq.tx_rate = cpu_to_le16(word);
> + scanreq.tx_rate = (__force u16)cpu_to_le16(word);
>
> /* set up the channel list */
> word = 0;
> @@ -197,10 +197,10 @@ int prism2mgmt_scan(struct wlandevice *wlandev, void *msgp)
> /* channel 1 is BIT 0 ... channel 14 is BIT 13 */
> word |= (1 << (channel - 1));
> }
> - scanreq.channel_list = cpu_to_le16(word);
> + scanreq.channel_list = (__force u16)cpu_to_le16(word);
>
> /* set up the ssid, if present. */
> - scanreq.ssid.len = cpu_to_le16(msg->ssid.data.len);
> + scanreq.ssid.len = (__force u16)cpu_to_le16(msg->ssid.data.len);
> memcpy(scanreq.ssid.data, msg->ssid.data.data, msg->ssid.data.len);
>
> /* Enable the MAC port if it's not already enabled */
> @@ -229,7 +229,7 @@ int prism2mgmt_scan(struct wlandevice *wlandev, void *msgp)
> /* Construct a bogus SSID and assign it to OwnSSID and
> * DesiredSSID
> */
> - wordbuf[0] = cpu_to_le16(WLAN_SSID_MAXLEN);
> + wordbuf[0] = (__force u16)cpu_to_le16(WLAN_SSID_MAXLEN);
> get_random_bytes(&wordbuf[1], WLAN_SSID_MAXLEN);
> result = hfa384x_drvr_setconfig(hw, HFA384x_RID_CNFOWNSSID,
> wordbuf,
> @@ -405,8 +405,8 @@ int prism2mgmt_scan_results(struct wlandevice *wlandev, void *msgp)
> /* signal and noise */
> req->signal.status = P80211ENUM_msgitem_status_data_ok;
> req->noise.status = P80211ENUM_msgitem_status_data_ok;
> - req->signal.data = le16_to_cpu(item->sl);
> - req->noise.data = le16_to_cpu(item->anl);
> + req->signal.data = le16_to_cpu((__force __le16)item->sl);
> + req->noise.data = le16_to_cpu((__force __le16)item->anl);
>
> /* BSSID */
> req->bssid.status = P80211ENUM_msgitem_status_data_ok;
> @@ -415,7 +415,7 @@ int prism2mgmt_scan_results(struct wlandevice *wlandev, void *msgp)
>
> /* SSID */
> req->ssid.status = P80211ENUM_msgitem_status_data_ok;
> - req->ssid.data.len = le16_to_cpu(item->ssid.len);
> + req->ssid.data.len = le16_to_cpu((__force __le16)item->ssid.len);
> req->ssid.data.len = min_t(u16, req->ssid.data.len, WLAN_SSID_MAXLEN);
> memcpy(req->ssid.data.data, item->ssid.data, req->ssid.data.len);
>
> @@ -463,7 +463,7 @@ int prism2mgmt_scan_results(struct wlandevice *wlandev, void *msgp)
>
> /* beacon period */
> req->beaconperiod.status = P80211ENUM_msgitem_status_data_ok;
> - req->beaconperiod.data = le16_to_cpu(item->bcnint);
> + req->beaconperiod.data = le16_to_cpu((__force __le16)item->bcnint);
>
> /* timestamps */
> req->timestamp.status = P80211ENUM_msgitem_status_data_ok;
> @@ -473,14 +473,14 @@ int prism2mgmt_scan_results(struct wlandevice *wlandev, void *msgp)
>
> /* atim window */
> req->ibssatimwindow.status = P80211ENUM_msgitem_status_data_ok;
> - req->ibssatimwindow.data = le16_to_cpu(item->atim);
> + req->ibssatimwindow.data = le16_to_cpu((__force __le16)item->atim);
>
> /* Channel */
> req->dschannel.status = P80211ENUM_msgitem_status_data_ok;
> - req->dschannel.data = le16_to_cpu(item->chid);
> + req->dschannel.data = le16_to_cpu((__force __le16)item->chid);
>
> /* capinfo bits */
> - count = le16_to_cpu(item->capinfo);
> + count = le16_to_cpu((__force __le16)item->capinfo);
> req->capinfo.status = P80211ENUM_msgitem_status_data_ok;
> req->capinfo.data = count;
>
> --
> 1.9.1
>

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