From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754140AbcHaAT2 (ORCPT ); Tue, 30 Aug 2016 20:19:28 -0400 Received: from down.free-electrons.com ([37.187.137.238]:46742 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751372AbcHaATZ (ORCPT ); Tue, 30 Aug 2016 20:19:25 -0400 From: Alexandre Belloni To: Alessandro Zummo Cc: Oleksij Rempel , rtc-linux@googlegroups.com, linux-kernel@vger.kernel.org, Alexandre Belloni Subject: [PATCH 2/2] rtc: asm9260: rework locking Date: Wed, 31 Aug 2016 02:18:05 +0200 Message-Id: <20160831001805.8367-2-alexandre.belloni@free-electrons.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20160831001805.8367-1-alexandre.belloni@free-electrons.com> References: <20160831001805.8367-1-alexandre.belloni@free-electrons.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The rtc-asm9260 driver uses a discrete spinlock (wrongly uninitialized). Use the rtc mutex to lock mmio accesses instead. Signed-off-by: Alexandre Belloni --- drivers/rtc/rtc-asm9260.c | 16 ++-------------- 1 file changed, 2 insertions(+), 14 deletions(-) diff --git a/drivers/rtc/rtc-asm9260.c b/drivers/rtc/rtc-asm9260.c index 5219916ce11d..812f131da694 100644 --- a/drivers/rtc/rtc-asm9260.c +++ b/drivers/rtc/rtc-asm9260.c @@ -112,8 +112,6 @@ struct asm9260_rtc_priv { void __iomem *iobase; struct rtc_device *rtc; struct clk *clk; - /* io lock */ - spinlock_t lock; }; static irqreturn_t asm9260_rtc_irq(int irq, void *dev_id) @@ -122,11 +120,13 @@ static irqreturn_t asm9260_rtc_irq(int irq, void *dev_id) u32 isr; unsigned long events = 0; + mutex_lock(&priv->rtc->ops_lock); isr = ioread32(priv->iobase + HW_CIIR); if (!isr) return IRQ_NONE; iowrite32(0, priv->iobase + HW_CIIR); + mutex_unlock(&priv->rtc->ops_lock); events |= RTC_AF | RTC_IRQF; @@ -139,9 +139,7 @@ static int asm9260_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct asm9260_rtc_priv *priv = dev_get_drvdata(dev); u32 ctime0, ctime1, ctime2; - unsigned long irq_flags; - spin_lock_irqsave(&priv->lock, irq_flags); ctime0 = ioread32(priv->iobase + HW_CTIME0); ctime1 = ioread32(priv->iobase + HW_CTIME1); ctime2 = ioread32(priv->iobase + HW_CTIME2); @@ -155,7 +153,6 @@ static int asm9260_rtc_read_time(struct device *dev, struct rtc_time *tm) ctime1 = ioread32(priv->iobase + HW_CTIME1); ctime2 = ioread32(priv->iobase + HW_CTIME2); } - spin_unlock_irqrestore(&priv->lock, irq_flags); tm->tm_sec = (ctime0 >> BM_CTIME0_SEC_S) & BM_CTIME0_SEC_M; tm->tm_min = (ctime0 >> BM_CTIME0_MIN_S) & BM_CTIME0_MIN_M; @@ -174,9 +171,7 @@ static int asm9260_rtc_read_time(struct device *dev, struct rtc_time *tm) static int asm9260_rtc_set_time(struct device *dev, struct rtc_time *tm) { struct asm9260_rtc_priv *priv = dev_get_drvdata(dev); - unsigned long irq_flags; - spin_lock_irqsave(&priv->lock, irq_flags); /* * make sure SEC counter will not flip other counter on write time, * real value will be written at the enf of sequence. @@ -191,7 +186,6 @@ static int asm9260_rtc_set_time(struct device *dev, struct rtc_time *tm) iowrite32(tm->tm_hour, priv->iobase + HW_HOUR); iowrite32(tm->tm_min, priv->iobase + HW_MIN); iowrite32(tm->tm_sec, priv->iobase + HW_SEC); - spin_unlock_irqrestore(&priv->lock, irq_flags); return 0; } @@ -199,9 +193,7 @@ static int asm9260_rtc_set_time(struct device *dev, struct rtc_time *tm) static int asm9260_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) { struct asm9260_rtc_priv *priv = dev_get_drvdata(dev); - unsigned long irq_flags; - spin_lock_irqsave(&priv->lock, irq_flags); alrm->time.tm_year = ioread32(priv->iobase + HW_ALYEAR); alrm->time.tm_mon = ioread32(priv->iobase + HW_ALMON); alrm->time.tm_mday = ioread32(priv->iobase + HW_ALDOM); @@ -213,7 +205,6 @@ static int asm9260_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) alrm->enabled = ioread32(priv->iobase + HW_AMR) ? 1 : 0; alrm->pending = ioread32(priv->iobase + HW_CIIR) ? 1 : 0; - spin_unlock_irqrestore(&priv->lock, irq_flags); return rtc_valid_tm(&alrm->time); } @@ -221,9 +212,7 @@ static int asm9260_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) static int asm9260_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) { struct asm9260_rtc_priv *priv = dev_get_drvdata(dev); - unsigned long irq_flags; - spin_lock_irqsave(&priv->lock, irq_flags); iowrite32(alrm->time.tm_year, priv->iobase + HW_ALYEAR); iowrite32(alrm->time.tm_mon, priv->iobase + HW_ALMON); iowrite32(alrm->time.tm_mday, priv->iobase + HW_ALDOM); @@ -234,7 +223,6 @@ static int asm9260_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) iowrite32(alrm->time.tm_sec, priv->iobase + HW_ALSEC); iowrite32(alrm->enabled ? 0 : BM_AMR_OFF, priv->iobase + HW_AMR); - spin_unlock_irqrestore(&priv->lock, irq_flags); return 0; } -- 2.9.3