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Date: Tue, 26 Jul 2022 07:09:49 +0200
From: Philipp Hortmann <philipp.g.hortmann@...il.com>
To: Phillip Potter <phil@...lpotter.co.uk>, gregkh@...uxfoundation.org,
dan.carpenter@...cle.com
Cc: Larry.Finger@...inger.net, paskripkin@...il.com,
straube.linux@...il.com, martin@...ser.cx, abdun.nihaal@...il.com,
linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] staging: r8188eu: convert rtw_pwr_wakeup to correct
error code semantics
On 7/26/22 00:07, Phillip Potter wrote:
> Convert the rtw_pwr_wakeup function to use 0 on success and an appropriate
> error code on error. For the first failure block where ips_leave is
> invoked, use -ENOMEM as this is the main cause of failure here anyway.
> For the second failure block, use -EBUSY, as it seems the most
> appropriate.
>
> Finally, within the functions rtw_wx_set_mode, rtw_wx_set_wap,
> rtw_wx_set_scan and rtw_wx_set_essid, pass the error code on from
> rtw_pwr_wakeup as appropriate now that it is converted.
>
> This gets the driver closer to removal of the non-standard _SUCCESS and
> _FAIL definitions, which are inverted compared to the standard in-kernel
> error code mechanism.
>
> Signed-off-by: Phillip Potter <phil@...lpotter.co.uk>
> ---
>
> Changes from V1: Act on feedback from Dan Carpenter:
> * Try to use more appropriate error codes than -EPERM.
> * Revert the places where existing -1 was converted as they are out of
> scope.
> * Preserve error codes in places where calling function already uses
> proper negative semantics, so that they can be passed through to the
> caller.
>
> ---
> drivers/staging/r8188eu/core/rtw_p2p.c | 4 ++--
> drivers/staging/r8188eu/core/rtw_pwrctrl.c | 10 ++++----
> drivers/staging/r8188eu/os_dep/ioctl_linux.c | 24 +++++++-------------
> 3 files changed, 15 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/staging/r8188eu/core/rtw_p2p.c b/drivers/staging/r8188eu/core/rtw_p2p.c
> index c306aafa183b..bd654d4ff8b4 100644
> --- a/drivers/staging/r8188eu/core/rtw_p2p.c
> +++ b/drivers/staging/r8188eu/core/rtw_p2p.c
> @@ -1888,7 +1888,7 @@ int rtw_p2p_enable(struct adapter *padapter, enum P2P_ROLE role)
>
> if (role == P2P_ROLE_DEVICE || role == P2P_ROLE_CLIENT || role == P2P_ROLE_GO) {
> /* leave IPS/Autosuspend */
> - if (rtw_pwr_wakeup(padapter) == _FAIL) {
> + if (rtw_pwr_wakeup(padapter)) {
> ret = _FAIL;
> goto exit;
> }
> @@ -1902,7 +1902,7 @@ int rtw_p2p_enable(struct adapter *padapter, enum P2P_ROLE role)
> init_wifidirect_info(padapter, role);
>
> } else if (role == P2P_ROLE_DISABLE) {
> - if (rtw_pwr_wakeup(padapter) == _FAIL) {
> + if (rtw_pwr_wakeup(padapter)) {
> ret = _FAIL;
> goto exit;
> }
> diff --git a/drivers/staging/r8188eu/core/rtw_pwrctrl.c b/drivers/staging/r8188eu/core/rtw_pwrctrl.c
> index cf9020a73933..8b1c50668dfe 100644
> --- a/drivers/staging/r8188eu/core/rtw_pwrctrl.c
> +++ b/drivers/staging/r8188eu/core/rtw_pwrctrl.c
> @@ -381,24 +381,24 @@ int rtw_pwr_wakeup(struct adapter *padapter)
> struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
> unsigned long timeout = jiffies + msecs_to_jiffies(3000);
> unsigned long deny_time;
> - int ret = _SUCCESS;
> + int ret = 0;
>
> while (pwrpriv->ps_processing && time_before(jiffies, timeout))
> msleep(10);
>
> /* I think this should be check in IPS, LPS, autosuspend functions... */
> if (check_fwstate(pmlmepriv, _FW_LINKED)) {
> - ret = _SUCCESS;
> + ret = 0;
> goto exit;
> }
>
> if (pwrpriv->rf_pwrstate == rf_off && ips_leave(padapter) == _FAIL) {
> - ret = _FAIL;
> + ret = -ENOMEM;
> goto exit;
> }
>
> if (padapter->bDriverStopped || !padapter->bup || !padapter->hw_init_completed) {
> - ret = _FAIL;
> + ret = -EBUSY;
> goto exit;
> }
>
> @@ -439,7 +439,7 @@ int rtw_pm_set_ips(struct adapter *padapter, u8 mode)
> return 0;
> } else if (mode == IPS_NONE) {
> rtw_ips_mode_req(pwrctrlpriv, mode);
> - if ((padapter->bSurpriseRemoved == 0) && (rtw_pwr_wakeup(padapter) == _FAIL))
> + if ((padapter->bSurpriseRemoved == 0) && rtw_pwr_wakeup(padapter))
> return -EFAULT;
> } else {
> return -EINVAL;
> diff --git a/drivers/staging/r8188eu/os_dep/ioctl_linux.c b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
> index 930bb4aea435..7f91dac2e41b 100644
> --- a/drivers/staging/r8188eu/os_dep/ioctl_linux.c
> +++ b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
> @@ -687,12 +687,9 @@ static int rtw_wx_set_mode(struct net_device *dev, struct iw_request_info *a,
> enum ndis_802_11_network_infra networkType;
> int ret = 0;
>
> -
> -
> - if (_FAIL == rtw_pwr_wakeup(padapter)) {
> - ret = -EPERM;
> + ret = rtw_pwr_wakeup(padapter);
> + if (ret)
> goto exit;
> - }
>
> if (!padapter->hw_init_completed) {
> ret = -EPERM;
> @@ -931,12 +928,9 @@ static int rtw_wx_set_wap(struct net_device *dev,
> struct wlan_network *pnetwork = NULL;
> enum ndis_802_11_auth_mode authmode;
>
> -
> -
> - if (_FAIL == rtw_pwr_wakeup(padapter)) {
> - ret = -1;
> + ret = rtw_pwr_wakeup(padapter);
> + if (ret)
> goto exit;
> - }
>
> if (!padapter->bup) {
> ret = -1;
> @@ -1049,10 +1043,9 @@ static int rtw_wx_set_scan(struct net_device *dev, struct iw_request_info *a,
> struct ndis_802_11_ssid ssid[RTW_SSID_SCAN_AMOUNT];
> struct wifidirect_info *pwdinfo = &padapter->wdinfo;
>
> - if (_FAIL == rtw_pwr_wakeup(padapter)) {
> - ret = -1;
> + ret = rtw_pwr_wakeup(padapter);
> + if (ret)
> goto exit;
> - }
>
> if (padapter->bDriverStopped) {
> ret = -1;
> @@ -1252,10 +1245,9 @@ static int rtw_wx_set_essid(struct net_device *dev,
>
> uint ret = 0, len;
>
> - if (_FAIL == rtw_pwr_wakeup(padapter)) {
> - ret = -1;
> + ret = rtw_pwr_wakeup(padapter);
> + if (ret)
> goto exit;
> - }
>
> if (!padapter->bup) {
> ret = -1;
Tested-by: Philipp Hortmann <philipp.g.hortmann@...il.com> # Edimax N150
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