提交 2fe121e1 编写于 作者: B Boris BREZILLON 提交者: Linus Torvalds

rtc: rtc-at91rm9200: fix infinite wait for ACKUPD irq

The rtc user must wait at least 1 sec between each time/calandar update
(see atmel's datasheet chapter "Updating Time/Calendar").

Use the 1Hz interrupt to update the at91_rtc_upd_rdy flag and wait for
the at91_rtc_wait_upd_rdy event if the rtc is not ready.

This patch fixes a deadlock in an uninterruptible wait when the RTC is
updated more than once every second.  AFAICT the bug is here from the
beginning, but I think we should at least backport this fix to 3.10 and
the following longterm and stable releases.
Signed-off-by: NBoris BREZILLON <boris.brezillon@free-electrons.com>
Reported-by: NBryan Evenson <bevenson@melinkcorp.com>
Tested-by: NBryan Evenson <bevenson@melinkcorp.com>
Cc: Andrew Victor <linux@maxim.org.za>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: <stable@vger.kernel.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
上级 68164a73
......@@ -48,6 +48,7 @@ struct at91_rtc_config {
static const struct at91_rtc_config *at91_rtc_config;
static DECLARE_COMPLETION(at91_rtc_updated);
static DECLARE_COMPLETION(at91_rtc_upd_rdy);
static unsigned int at91_alarm_year = AT91_RTC_EPOCH;
static void __iomem *at91_rtc_regs;
static int irq;
......@@ -161,6 +162,8 @@ static int at91_rtc_settime(struct device *dev, struct rtc_time *tm)
1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
wait_for_completion(&at91_rtc_upd_rdy);
/* Stop Time/Calendar from counting */
cr = at91_rtc_read(AT91_RTC_CR);
at91_rtc_write(AT91_RTC_CR, cr | AT91_RTC_UPDCAL | AT91_RTC_UPDTIM);
......@@ -183,7 +186,9 @@ static int at91_rtc_settime(struct device *dev, struct rtc_time *tm)
/* Restart Time/Calendar */
cr = at91_rtc_read(AT91_RTC_CR);
at91_rtc_write(AT91_RTC_SCCR, AT91_RTC_SECEV);
at91_rtc_write(AT91_RTC_CR, cr & ~(AT91_RTC_UPDCAL | AT91_RTC_UPDTIM));
at91_rtc_write_ier(AT91_RTC_SECEV);
return 0;
}
......@@ -290,8 +295,10 @@ static irqreturn_t at91_rtc_interrupt(int irq, void *dev_id)
if (rtsr) { /* this interrupt is shared! Is it ours? */
if (rtsr & AT91_RTC_ALARM)
events |= (RTC_AF | RTC_IRQF);
if (rtsr & AT91_RTC_SECEV)
events |= (RTC_UF | RTC_IRQF);
if (rtsr & AT91_RTC_SECEV) {
complete(&at91_rtc_upd_rdy);
at91_rtc_write_idr(AT91_RTC_SECEV);
}
if (rtsr & AT91_RTC_ACKUPD)
complete(&at91_rtc_updated);
......@@ -413,6 +420,11 @@ static int __init at91_rtc_probe(struct platform_device *pdev)
return PTR_ERR(rtc);
platform_set_drvdata(pdev, rtc);
/* enable SECEV interrupt in order to initialize at91_rtc_upd_rdy
* completion.
*/
at91_rtc_write_ier(AT91_RTC_SECEV);
dev_info(&pdev->dev, "AT91 Real Time Clock driver.\n");
return 0;
}
......
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