linux-kernel - [PATCH] staging: rtlwifi: rtlwifi: use ktime_get_real

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Message-Id: <20171107104415.3041680-1-arnd@arndb.de>
Date:   Tue,  7 Nov 2017 11:43:34 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        Larry Finger <Larry.Finger@...inger.net>,
        Ping-Ke Shih <pkshih@...ltek.com>
Cc:     Arnd Bergmann <arnd@...db.de>, shaofu <shaofu@...ltek.com>,
        "Tobin C. Harding" <me@...in.cc>, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] staging: rtlwifi: rtlwifi: use ktime_get_real_seconds() for suspend time

do_gettimeofday() is deprecated and slower than necessary for the purpose
of reading the seconds. This changes rtl_op_suspend/resume to use
ktime_get_real_seconds() instead, which is simpler and avoids confusion
about whether it is y2038-safe or not.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
This duplicates what I did for the regular (non-staging) rtlwifi driver
---
 drivers/staging/rtlwifi/core.c | 8 ++------
 drivers/staging/rtlwifi/wifi.h | 2 +-
 2 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/staging/rtlwifi/core.c b/drivers/staging/rtlwifi/core.c
index b00e51df984f..a43d37452e8b 100644
--- a/drivers/staging/rtlwifi/core.c
+++ b/drivers/staging/rtlwifi/core.c
@@ -509,15 +509,13 @@ static int rtl_op_suspend(struct ieee80211_hw *hw,
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
 	struct rtl_hal *rtlhal = rtl_hal(rtlpriv);
 	struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
-	struct timeval ts;
 
 	RT_TRACE(rtlpriv, COMP_POWER, DBG_DMESG, "\n");
 	if (WARN_ON(!wow))
 		return -EINVAL;
 
 	/* to resolve s4 can not wake up*/
-	do_gettimeofday(&ts);
-	rtlhal->last_suspend_sec = ts.tv_sec;
+	rtlhal->last_suspend_sec = ktime_get_real_seconds();
 
 	if ((ppsc->wo_wlan_mode & WAKE_ON_PATTERN_MATCH) && wow->n_patterns)
 		_rtl_add_wowlan_patterns(hw, wow);
@@ -536,7 +534,6 @@ static int rtl_op_resume(struct ieee80211_hw *hw)
 	struct rtl_priv *rtlpriv = rtl_priv(hw);
 	struct rtl_hal *rtlhal = rtl_hal(rtlpriv);
 	struct rtl_mac *mac = rtl_mac(rtl_priv(hw));
-	struct timeval ts;
 
 	RT_TRACE(rtlpriv, COMP_POWER, DBG_DMESG, "\n");
 	rtlhal->driver_is_goingto_unload = false;
@@ -544,8 +541,7 @@ static int rtl_op_resume(struct ieee80211_hw *hw)
 	rtlhal->wake_from_pnp_sleep = true;
 
 	/* to resovle s4 can not wake up*/
-	do_gettimeofday(&ts);
-	if (ts.tv_sec - rtlhal->last_suspend_sec < 5)
+	if (ktime_get_real_seconds() - rtlhal->last_suspend_sec < 5)
 		return -1;
 
 	rtl_op_start(hw);
diff --git a/drivers/staging/rtlwifi/wifi.h b/drivers/staging/rtlwifi/wifi.h
index eb91c130b245..ca0243fa2e66 100644
--- a/drivers/staging/rtlwifi/wifi.h
+++ b/drivers/staging/rtlwifi/wifi.h
@@ -1670,7 +1670,7 @@ struct rtl_hal {
 	bool enter_pnp_sleep;
 	bool wake_from_pnp_sleep;
 	bool wow_enabled;
-	__kernel_time_t last_suspend_sec;
+	time64_t last_suspend_sec;
 	u32 wowlan_fwsize;
 	u8 *wowlan_firmware;
 
-- 
2.9.0