linux-toradex.git/drivers/rtc, branch v3.0.3

drivers/rtc/rtc-tegra.c: properly initialize spinlock

2011-08-05T04:58:32+00:00

commit e57ee01750c4954fd0b5e3c6109cd4b870880eb9 upstream.

Using __SPIN_LOCK_UNLOCKED for a dynamically allocated lock is wrong and
breaks the build with PREEMPT_RT_FULL.

Signed-off-by: Uwe Kleine-König 
Cc: Andrew Chew 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

rtc: limit frequency

2011-08-05T04:58:32+00:00

commit 431e2bcc371016824f419baa745f82388258f3ee upstream.

Due to the hrtimer self rearming mode a user can DoS the machine simply
because it's starved by hrtimer events.

The RTC hrtimer is self rearming.  We really need to limit the frequency
to something sensible.

Signed-off-by: Thomas Gleixner 
Cc: John Stultz 
Cc: Ingo Molnar 
Cc: Ben Greear 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

rtc: fix hrtimer deadlock

2011-08-05T04:58:32+00:00

commit b830ac1d9a2262093bb0f3f6a2fd2a1c8278daf5 upstream.

Ben reported a lockup related to rtc. The lockup happens due to:

CPU0                                        CPU1

rtc_irq_set_state()			    __run_hrtimer()
  spin_lock_irqsave(&rtc->irq_task_lock)    rtc_handle_legacy_irq();
					      spin_lock(&rtc->irq_task_lock);
  hrtimer_cancel()
    while (callback_running);

So the running callback never finishes as it's blocked on
rtc->irq_task_lock.

Use hrtimer_try_to_cancel() instead and drop rtc->irq_task_lock while
waiting for the callback.  Fix this for both rtc_irq_set_state() and
rtc_irq_set_freq().

Signed-off-by: Thomas Gleixner 
Reported-by: Ben Greear 
Cc: John Stultz 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

rtc: handle errors correctly in rtc_irq_set_state()

2011-08-05T04:58:32+00:00

commit 2c4f57d12df7696d65b0247bfd57fd082a7719e6 upstream.

The code checks the correctness of the parameters, but unconditionally
arms/disarms the hrtimer.

The result is that a random task might arm/disarm rtc timer and surprise
the real owner by either generating events or by stopping them.

Signed-off-by: Thomas Gleixner 
Cc: John Stultz 
Cc: Ingo Molnar 
Cc: Ben Greear 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds 
Signed-off-by: Greg Kroah-Hartman

drivers/rtc/rtc-ds1307.c: add support for RTC device pt7c4338

2011-06-28T01:00:12+00:00

PT7C4338 chip is being manufactured by Pericom Technology Inc.  It is a
serial real-time clock which provides:

1) Low-power clock/calendar.
2) Programmable square-wave output.

It has 56 bytes of nonvolatile RAM.  Its register set is same as that of
rtc device: DS1307.

Signed-off-by: Priyanka Jain 
Acked-by: Timur Tabi 
Reviewed-by: Wolfram Sang 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

rtc: vt8500: Fix build error & cleanup rtc_class_ops->update_irq_enable()

2011-06-23T23:11:39+00:00

Now that the generic code handles UIE mode irqs via periodic
alarm interrupts, no one calls the
rtc_class_ops->update_irq_enable() method anymore.

Further the rtc_class_ops doesn't have a update_irq_enable element
anymore, so this causes a build error.

This patch removes the driver hooks and implementations of
update_irq_enable and the associated setup.

[wsa: updated commit-message and removed update_irq_enable-function, too]
[jstultz: improve commit message, clarifying build issue]
Signed-off-by: Alexey Charkov 
Signed-off-by: Wolfram Sang 
Signed-off-by: John Stultz

Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2011-06-13T17:47:04+00:00

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  rtc: Staticize non-exported __rtc_set_alarm()
  rtc: Fix ioctl error path return
  ptp: Fix some locking bugs in ptp_read()
  ptp: Return -EFAULT on copy_to_user() errors

unicore32: move rtc-puv3.c to drivers/rtc directory

2011-06-09T08:15:24+00:00

The patch moves rtc driver for PKUnity-v3 SoC from arch/unicore32/kernel/
to drivers/rtc/, with renaming it to rtc-puv3.c.
Also, Kconfig, Makefile, and MAINTAINERS are modified correspondingly.

Signed-off-by: Guan Xuetao 
Acked-by: Arnd Bergmann

spi/rtc-m41t93: Use spi_get_drvdata() for SPI devices

2011-06-08T20:33:48+00:00

One new offender detected by the recently increased type checking in
platform_get_drvdata():

drivers/rtc/rtc-m41t93.c: In function ‘m41t93_remove’:
drivers/rtc/rtc-m41t93.c:192: warning: passing argument 1 of ‘platform_get_drvdata’ from incompatible pointer type

Use spi_get_drvdata() instead of platform_get_drvdata(), cfr. commit
42fea15d6dc410e62dac6a764142045280624a5b ("spi/rtc-{ds1390,ds3234,m41t94}:
Use spi_get_drvdata() for SPI devices")

Signed-off-by: Geert Uytterhoeven 
Signed-off-by: Grant Likely

rtc: Staticize non-exported __rtc_set_alarm()

2011-06-02T02:29:40+00:00

It's not referenced outside this file so there's no need for it to be in
the global namespace and sparse warns about that.

Signed-off-by: Mark Brown 
Signed-off-by: John Stultz