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linux/drivers/rtc
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Thomas Gleixner b830ac1d9a rtc: fix hrtimer deadlock 
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 <tglx@linutronix.de>
Reported-by: Ben Greear <greearb@candelatech.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2011-07-26 16:49:42 -07:00
..
Kconfig drivers/rtc: add support for Qualcomm PMIC8xxx RTC 2011-07-25 20:57:17 -07:00
Makefile drivers/rtc: add support for Qualcomm PMIC8xxx RTC 2011-07-25 20:57:17 -07:00
class.c rtc: Avoid accumulating time drift in suspend/resume 2011-06-21 16:55:39 -07:00
hctosys.c rtc/hctosys: only claim the RTC provided the system time if it did 2010-03-12 15:52:28 -08:00
interface.c rtc: fix hrtimer deadlock 2011-07-26 16:49:42 -07:00
rtc-88pm860x.c mfd: Add rtc support to 88pm860x 2011-05-26 19:45:34 +02:00
rtc-ab3100.c drivers/rtc/rtc-ab3100.c: add missing platform_set_drvdata() in ab3100_rtc_probe() 2010-09-22 17:22:39 -07:00
rtc-ab8500.c mfd: Align ab8500 with the abx500 interface 2010-10-29 00:29:19 +02:00
rtc-at32ap700x.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
rtc-at91rm9200.c Fix common misspellings 2011-03-31 11:26:23 -03:00
rtc-at91sam9.c RTC: Clean out UIE icotl implementations 2011-03-09 11:24:54 -08:00
rtc-au1xxx.c
…
rtc-bfin.c Merge branch 'fortglx/39/tip/timers/rtc' of git://git.linaro.org/people/jstultz/linux into timers/urgent 2011-04-13 01:54:09 +02:00
rtc-bq32k.c
…
rtc-bq4802.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
rtc-cmos.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
rtc-coh901331.c rtc: fix coh901331 startup crash 2011-04-20 18:46:56 +02:00
rtc-core.h
…
rtc-davinci.c rtc: davinci: Initialize drvdata before registering device 2011-05-06 17:41:06 -07:00
rtc-dev.c rtc: Fix ioctl error path return 2011-06-01 19:29:39 -07:00
rtc-dm355evm.c
…
rtc-ds1216.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
rtc-ds1286.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
rtc-ds1302.c sh: mach-snapgear: Kill off machtype, consolidate board def. 2010-10-29 19:06:53 +09:00
rtc-ds1305.c RTC: Convert rtc drivers to use the alarm_irq_enable method 2011-02-03 13:02:35 -08:00
rtc-ds1307.c drivers/rtc/rtc-ds1307.c: add support for RTC device pt7c4338 2011-06-27 18:00:12 -07:00
rtc-ds1374.c rtc: convert DS1374 to dev_pm_ops 2011-03-22 17:44:16 -07:00
rtc-ds1390.c spi/rtc-{ds1390,ds3234,m41t94}: Use spi_get_drvdata() for SPI devices 2011-03-17 10:32:47 -06:00
rtc-ds1511.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
rtc-ds1553.c RTC: Cleanup rtc_class_ops->update_irq_enable() 2011-03-09 11:23:37 -08:00
rtc-ds1672.c
…
rtc-ds1742.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
rtc-ds3232.c RTC: Cleanup rtc_class_ops->update_irq_enable() 2011-03-09 11:23:37 -08:00
rtc-ds3234.c spi/rtc-{ds1390,ds3234,m41t94}: Use spi_get_drvdata() for SPI devices 2011-03-17 10:32:47 -06:00
rtc-efi.c
…
rtc-em3027.c rtc: add EM3027 rtc driver 2011-05-26 17:12:33 -07:00
rtc-ep93xx.c rtc: ep93xx: Initialize drvdata before registering device 2011-05-06 17:42:04 -07:00
rtc-fm3130.c rtc: fixes and new functionality for fm3130 2010-08-11 08:59:07 -07:00
rtc-generic.c
…
rtc-imxdi.c rtc: driver for the DryIce block found in i.MX25 chips 2010-08-11 08:59:07 -07:00
rtc-isl1208.c drivers/rtc/rtc-isl1208.c: add alarm support 2011-03-22 17:44:16 -07:00
rtc-isl12022.c rtc-isl12022: properly handle military hour format 2010-08-11 08:59:08 -07:00
rtc-jz4740.c RTC: Cleanup rtc_class_ops->update_irq_enable() 2011-03-09 11:23:37 -08:00
rtc-lib.c RTC: Rework RTC code to use timerqueue for events 2010-12-10 22:24:24 -08:00
rtc-lpc32xx.c Fix common misspellings 2011-03-31 11:26:23 -03:00
rtc-m41t80.c rtc: m41t80: Initialize clientdata before registering device 2011-05-06 18:01:02 -07:00
rtc-m41t93.c spi/rtc-m41t93: Use spi_get_drvdata() for SPI devices 2011-06-08 14:33:48 -06:00
rtc-m41t94.c spi/rtc-{ds1390,ds3234,m41t94}: Use spi_get_drvdata() for SPI devices 2011-03-17 10:32:47 -06:00
rtc-m48t35.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
rtc-m48t59.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
rtc-m48t86.c rtc/m48t86: use rtc_valid_tm() to check returned tm 2010-08-11 08:59:07 -07:00
rtc-max6900.c rtc/max6900: use rtc_valid_tm() to check returning tm 2010-08-11 08:59:07 -07:00
rtc-max6902.c rtc: rtc-max6902 - set driver data in max6902_probe() 2011-01-13 08:03:12 -08:00
rtc-max8925.c rtc: max8925: Initialize drvdata before registering device 2011-05-06 18:02:00 -07:00
rtc-max8998.c rtc: max8998: Initialize drvdata before registering device 2011-05-06 18:02:02 -07:00
rtc-mc13xxx.c rtc: mc13xxx: Don't call rtc_device_register while holding lock 2011-05-06 18:02:07 -07:00
rtc-mpc5121.c drivers/rtc/rtc-mpc5121.c: add support for RTC on MPC5200 2011-07-25 20:57:17 -07:00
rtc-mrst.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
rtc-msm6242.c rtc: msm6242: Initialize drvdata before registering device 2011-05-06 18:02:03 -07:00
rtc-mv.c RTC: Convert rtc drivers to use the alarm_irq_enable method 2011-02-03 13:02:35 -08:00
rtc-mxc.c drivers/rtc/rtc-mxc.c: remove defines already included in rtc.h 2011-05-26 17:12:33 -07:00
rtc-nuc900.c RTC: Cleanup rtc_class_ops->update_irq_enable() 2011-03-09 11:23:37 -08:00
rtc-omap.c RTC: rtc-omap: Fix a leak of the IRQ during init failure 2011-04-18 10:39:38 +02:00
rtc-pcap.c rtc: pcap: Initialize drvdata before registering device 2011-05-06 18:02:04 -07:00
rtc-pcf2123.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
rtc-pcf8563.c drivers/rtc/rtc-pcf8563.c: remove unused struct 2010-08-11 08:59:06 -07:00
rtc-pcf8583.c
…
rtc-pcf50633.c drivers/rtc/rtc-pcf50633.c: don't request update IRQ 2011-05-26 17:12:33 -07:00
rtc-pl030.c Merge branches 'defcfg', 'drivers' and 'cyberpro-next' of master.kernel.org:/home/rmk/linux-2.6-arm 2011-03-17 18:48:35 -07:00
rtc-pl031.c Merge branches 'defcfg', 'drivers' and 'cyberpro-next' of master.kernel.org:/home/rmk/linux-2.6-arm 2011-03-17 18:48:35 -07:00
rtc-pm8xxx.c drivers/rtc: add support for Qualcomm PMIC8xxx RTC 2011-07-25 20:57:17 -07:00
rtc-proc.c RTC: Include information about UIE and PIE in RTC driver proc. 2011-03-09 11:25:04 -08:00
rtc-ps3.c
…
rtc-puv3.c treewide: Convert uses of struct resource to resource_size(ptr) 2011-06-10 14:55:36 +02:00
rtc-pxa.c RTC: Cleanup rtc_class_ops->update_irq_enable() 2011-03-09 11:23:37 -08:00
rtc-r9701.c
…
rtc-rp5c01.c rtc: rp5c01: Initialize drvdata before registering device 2011-05-06 18:02:05 -07:00
rtc-rs5c313.c rtc: rtc-rs5c313: ctrl_in/outX to __raw_read/writeX conversion. 2010-10-27 15:30:32 +09:00
rtc-rs5c348.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
rtc-rs5c372.c RTC: Clean out UIE icotl implementations 2011-03-09 11:24:54 -08:00
rtc-rv3029c2.c rtc: add rv3029c2 RTC support 2011-05-26 17:12:33 -07:00
rtc-rx8025.c RTC: Cleanup rtc_class_ops->irq_set_state 2011-03-09 11:23:34 -08:00
rtc-rx8581.c drivers/rtc/rtc-rx8581.c: fix setdatetime 2010-07-27 14:32:06 -07:00
rtc-s3c.c Merge 'akpm' patch series 2011-07-25 21:00:19 -07:00
rtc-s35390a.c i2c: Remove all i2c_set_clientdata(client, NULL) in drivers 2010-06-03 11:33:58 +02:00
rtc-sa1100.c RTC: sa1100: Update the sa1100 RTC driver. 2011-03-09 11:25:08 -08:00
rtc-sh.c drivers: Final irq namespace conversion 2011-03-29 14:48:19 +02:00
rtc-spear.c rtc: add support for spear rtc 2011-05-26 17:12:33 -07:00
rtc-starfire.c
…
rtc-stk17ta8.c sysfs: add struct file* to bin_attr callbacks 2010-05-21 09:37:31 -07:00
rtc-stmp3xxx.c rtc: stmp3xxx: Remove UIE handlers 2011-07-01 18:09:57 -07:00
rtc-sun4v.c
…
rtc-sysfs.c rtc/hctosys: only claim the RTC provided the system time if it did 2010-03-12 15:52:28 -08:00
rtc-tegra.c drivers/rtc/rtc-tegra.c: properly initialize spinlock 2011-07-25 20:57:17 -07:00
rtc-test.c RTC: Fix the cross interrupt issue on rtc-test. 2011-03-09 11:25:07 -08:00
rtc-tile.c tile: add an RTC driver for the Tilera hypervisor 2011-05-17 14:44:36 -04:00
rtc-twl.c drivers/rtc/rtc-twl.c: check return value of twl_rtc_write_u8() in twl_rtc_set_time() 2011-07-25 20:57:17 -07:00
rtc-tx4939.c sysfs: add struct file* to bin_attr callbacks 2010-05-21 09:37:31 -07:00
rtc-v3020.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
rtc-vr41xx.c RTC: Cleanup rtc_class_ops->irq_set_freq() 2011-03-09 11:23:35 -08:00
rtc-vt8500.c rtc: vt8500: Use define instead of hardcoded value for status bit 2011-07-01 17:59:36 -07:00
rtc-wm831x.c RTC: Cleanup rtc_class_ops->update_irq_enable() 2011-03-09 11:23:37 -08:00
rtc-wm8350.c RTC: Cleanup rtc_class_ops->update_irq_enable() 2011-03-09 11:23:37 -08:00
rtc-x1205.c Fix common misspellings 2011-03-31 11:26:23 -03:00