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bd0d673023edfeaedf57b68e39e7795cdcee4e45
linux/drivers/rtc
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Stewart Smith b7dc0f5321 rtc-opal: Fix handling of firmware error codes, prevent busy loops 
commit 5b8b580630 upstream.

According to the OPAL docs:
  skiboot-5.2.5/doc/opal-api/opal-rtc-read-3.txt
  skiboot-5.2.5/doc/opal-api/opal-rtc-write-4.txt

OPAL_HARDWARE may be returned from OPAL_RTC_READ or OPAL_RTC_WRITE and
this indicates either a transient or permanent error.

Prior to this patch, Linux was not dealing with OPAL_HARDWARE being a
permanent error particularly well, in that you could end up in a busy
loop.

This was not too hard to trigger on an AMI BMC based OpenPOWER machine
doing a continuous "ipmitool mc reset cold" to the BMC, the result of
that being that we'd get stuck in an infinite loop in
opal_get_rtc_time().

We now retry a few times before returning the error higher up the
stack.

Fixes: 16b1d26e77 ("rtc/tpo: Driver to support rtc and wakeup on PowerNV platform")
Cc: stable@vger.kernel.org # v3.19+
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-02-22 15:43:48 +01:00
..
class.c
rtc: make class.c explicitly non-modular
2016-03-14 17:08:18 +01:00
hctosys.c
rtc: use more standard kernel logging styles
2015-04-17 09:04:02 -04:00
interface.c
rtc: set the alarm to the next expiring timer
2017-12-25 14:23:46 +01:00
Kconfig
rtc: sun6i: Disable the build as a module
2017-03-12 06:41:52 +01:00
Makefile
rtc: isl12057: remove driver
2016-08-31 18:21:34 +02:00
rtc-88pm80x.c
rtc: 88pm80x: add device tree support
2015-09-05 13:19:05 +02:00
rtc-88pm860x.c
rtc: drop owner assignment from platform_drivers
2014-10-20 16:21:31 +02:00
rtc-ab3100.c
drivers/rtc/ab3100: Update driver to address y2038/y2106 issues
2015-04-03 08:18:25 +02:00
rtc-ab8500.c
rtc: ab8500: remove misuse of IRQF_NO_SUSPEND flag
2015-11-08 14:12:25 +01:00
rtc-ab-b5ze-s3.c
rtc: Export OF module alias information in missing drivers
2015-09-05 13:19:08 +02:00
rtc-abx80x.c
rtc: abx80x: use devm_add_action_or_reset()
2016-07-19 17:27:42 +02:00
rtc-ac100.c
rtc: ac100: Add NULL checking for devm_kzalloc call
2016-09-22 00:14:41 +02:00
rtc-armada38x.c
rtc: Fix module autoload for OF platform drivers
2015-09-05 19:37:22 +02:00
rtc-as3722.c
rtc: as3722: Drop IRQF_EARLY_RESUME flag
2016-03-14 17:08:25 +01:00
rtc-asm9260.c
rtc: asm9260: fix module autoload
2016-10-19 08:45:48 +02:00
rtc-at32ap700x.c
rtc: constify rtc_class_ops structures
2016-09-02 01:24:06 +02:00
rtc-at91rm9200.c
rtc: at91rm9200: clear RTC alarm status flag prior to suspending
2015-11-08 14:12:28 +01:00
rtc-at91rm9200.h
Revert "drivers/rtc/rtc-at91rm9200.c: use a variable for storing IMR"
2013-04-05 09:36:53 -07:00
rtc-at91sam9.c
rtc: at91sam9: Fix missing spin_lock_init()
2016-07-26 00:09:18 +02:00
rtc-au1xxx.c
rtc: drop owner assignment from platform_drivers
2014-10-20 16:21:31 +02:00
rtc-bfin.c
rtc: Drop (un)likely before IS_ERR(_OR_NULL)
2015-09-05 13:19:09 +02:00
rtc-bq32k.c
rtc: bq32k: Fix handling of oscillator failure flag
2016-08-31 18:21:35 +02:00
rtc-bq4802.c
rtc: drop owner assignment from platform_drivers
2014-10-20 16:21:31 +02:00
rtc-cmos.c
rtc: cmos: Don't enable interrupts in the middle of the interrupt handler
2016-10-20 17:40:06 +02:00
rtc-coh901331.c
rtc: constify rtc_class_ops structures
2016-09-02 01:24:06 +02:00
rtc-core.h
rtc: switch to using is_visible() to control sysfs attributes
2015-09-05 13:19:07 +02:00
rtc-da9052.c
rtc: explicitly set tm_sec = 0 for drivers with minute accurancy
2016-07-19 18:15:21 +02:00
rtc-da9055.c
rtc: explicitly set tm_sec = 0 for drivers with minute accurancy
2016-07-19 18:15:21 +02:00
rtc-da9063.c
rtc: da9063: avoid writing undefined data to rtc
2016-01-11 20:19:57 +01:00
rtc-davinci.c
rtc: constify rtc_class_ops structures
2016-09-02 01:24:06 +02:00
rtc-dev.c
rtc: dev: properly manage lifetime of dev and cdev in rtc device
2015-09-05 13:19:07 +02:00
rtc-digicolor.c
rtc: constify rtc_class_ops structures
2016-09-02 01:24:06 +02:00
rtc-dm355evm.c
rtc: drop owner assignment from platform_drivers
2014-10-20 16:21:31 +02:00
rtc-ds1216.c
rtc: remove useless DRV_VERSION
2016-05-20 12:33:51 +02:00
rtc-ds1286.c
rtc: ds1286: move header to linux/rtc
2016-07-08 16:23:11 +02:00
rtc-ds1302.c
rtc: constify rtc_class_ops structures
2016-09-02 01:24:06 +02:00
rtc-ds1305.c
rtc: simplify implementations of read_alarm
2016-07-09 10:24:45 +02:00
rtc-ds1307.c
rtc: ds1307: add Intersil ISL12057 support
2016-08-31 18:21:34 +02:00
rtc-ds1343.c
rtc: simplify implementations of read_alarm
2016-07-09 10:24:45 +02:00
rtc-ds1347.c
rtc: ds1347: changed raw spi calls to register map calls
2016-09-22 00:14:40 +02:00
rtc-ds1374.c
rtc: ds1374: Remove unused variable
2015-09-05 19:37:22 +02:00
rtc-ds1390.c
Merge tag 'rtc-v4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux
2015-11-10 10:01:21 -08:00
rtc-ds1511.c
rtc: remove useless DRV_VERSION
2016-05-20 12:33:51 +02:00
rtc-ds1553.c
rtc: remove useless DRV_VERSION
2016-05-20 12:33:51 +02:00
rtc-ds1672.c
rtc: remove useless DRV_VERSION
2016-05-20 12:33:51 +02:00
rtc-ds1685.c
rtc: simplify implementations of read_alarm
2016-07-09 10:24:45 +02:00
rtc-ds1742.c
rtc: remove useless DRV_VERSION
2016-05-20 12:33:51 +02:00
rtc-ds2404.c
rtc: ds2404: move rtc-ds2404.h to platform_data
2016-06-27 10:48:28 +02:00
rtc-ds3232.c
rtc: simplify implementations of read_alarm
2016-07-09 10:24:45 +02:00
rtc-efi-platform.c
rtc: use more standard kernel logging styles
2015-04-17 09:04:02 -04:00
rtc-efi.c
rtc: efi: Fail probing if RTC reads don't work
2016-06-06 17:07:33 +02:00
rtc-em3027.c
drivers/rtc/rtc-em3027.c: add device tree support
2015-04-17 09:03:59 -04:00
rtc-ep93xx.c
rtc: remove useless DRV_VERSION
2016-05-20 12:33:51 +02:00
rtc-fm3130.c
rtc: Drop owner assignment from i2c_driver
2015-09-05 13:19:06 +02:00
rtc-gemini.c
rtc: constify rtc_class_ops structures
2016-09-02 01:24:06 +02:00
rtc-generic.c
rtc: generic: remove get_rtc_time/set_rtc_time wrappers
2016-06-04 00:23:35 +02:00
rtc-hid-sensor-time.c
rtc: hid-sensor-time: Constify platform_device_id
2015-06-19 20:03:20 +02:00
rtc-hym8563.c
rtc: hym8563: in .read_alarm set .tm_sec to 0 to signal minute accuracy
2016-07-19 18:18:06 +02:00
rtc-imxdi.c
rtc: imxdi: fix spelling mistake in warning message
2016-01-11 20:19:58 +01:00
rtc-isl1208.c
rtc: remove useless DRV_VERSION
2016-05-20 12:33:51 +02:00
rtc-isl12022.c
rtc: remove useless DRV_VERSION
2016-05-20 12:33:51 +02:00
rtc-jz4740.c
rtc: constify rtc_class_ops structures
2016-09-02 01:24:06 +02:00
rtc-lib.c
rtc/lib: Provide y2038 safe rtc_tm_to_time()/rtc_time_to_tm() replacement
2014-11-21 12:00:00 -08:00
rtc-lp8788.c
rtc: drop owner assignment from platform_drivers
2014-10-20 16:21:31 +02:00
rtc-lpc24xx.c
rtc: add rtc-lpc24xx driver
2015-09-05 13:19:06 +02:00
rtc-lpc32xx.c
rtc: lpc32xx: remove irq > NR_IRQS check from probe()
2016-01-11 20:19:59 +01:00
rtc-ls1x.c
MIPS: Loongson: Naming style cleanup and rework
2015-06-21 21:53:59 +02:00
rtc-m41t80.c
rtc: m41t80: add suspend handlers for alarm IRQ
2016-07-21 20:06:57 +02:00
rtc-m41t93.c
spi: Drop owner assignment from spi_drivers
2015-10-28 10:30:17 +09:00
rtc-m41t94.c
spi: Drop owner assignment from spi_drivers
2015-10-28 10:30:17 +09:00
rtc-m48t35.c
rtc: remove useless DRV_VERSION
2016-05-20 12:33:51 +02:00
rtc-m48t59.c
rtc: m48t59: clean up m48t59_nvram_read()/m48t59_nvram_write()
2015-09-05 13:19:10 +02:00
rtc-m48t86.c
rtc: m48t86: move m48t86.h to platform_data
2016-06-27 18:15:25 +02:00
rtc-max6900.c
rtc: remove useless DRV_VERSION
2016-05-20 12:33:51 +02:00
rtc-max6902.c
spi: Drop owner assignment from spi_drivers
2015-10-28 10:30:17 +09:00
rtc-max6916.c
rtc: add support for Maxim max6916
2016-06-04 16:05:59 +02:00
rtc-max8907.c
rtc: drop owner assignment from platform_drivers
2014-10-20 16:21:31 +02:00
rtc-max8925.c
rtc: drop owner assignment from platform_drivers
2014-10-20 16:21:31 +02:00
rtc-max8997.c
rtc: Fix module autoload for rtc-{ab8500,max8997,s5m} drivers
2015-09-05 19:37:21 +02:00
rtc-max8998.c
rtc: ds1672, max6900, max8998: Add MODULE_DEVICE_TABLE
2015-06-25 01:13:36 +02:00
rtc-max77686.c
rtc: max77686: Use REGMAP_IRQ_REG for regmap-rtc-irqs initialisation
2016-03-14 17:08:27 +01:00
rtc-mc13xxx.c
rtc: mc13xxx: remove UIE signaling
2016-05-20 12:33:51 +02:00
rtc-mc146818-lib.c
rtc: move mc146818 helper functions out-of-line
2016-06-26 01:20:08 +02:00
rtc-mcp795.c
rtc: constify rtc_class_ops structures
2016-09-02 01:24:06 +02:00
rtc-moxart.c
rtc: Fix module autoload for OF platform drivers
2015-09-05 19:37:22 +02:00
rtc-mpc5121.c
rtc: Fix module autoload for OF platform drivers
2015-09-05 19:37:22 +02:00
rtc-mrst.c
rtc: simplify implementations of read_alarm
2016-07-09 10:24:45 +02:00
rtc-msm6242.c
rtc: use more standard kernel logging styles
2015-04-17 09:04:02 -04:00
rtc-mt6397.c
rtc: constify rtc_class_ops structures
2016-09-02 01:24:06 +02:00
rtc-mv.c
rtc: Fix module autoload for OF platform drivers
2015-09-05 19:37:22 +02:00
rtc-mxc.c
rtc: mxc: remove UIE signaling
2016-05-20 12:33:51 +02:00
rtc-nuc900.c
rtc: constify rtc_class_ops structures
2016-09-02 01:24:06 +02:00
rtc-omap.c
rtc: omap: prevent disabling of clock/module during suspend
2016-11-04 23:11:39 +01:00
rtc-opal.c
rtc-opal: Fix handling of firmware error codes, prevent busy loops
2018-02-22 15:43:48 +01:00
rtc-palmas.c
rtc: constify rtc_class_ops structures
2016-09-02 01:24:06 +02:00
rtc-pcap.c
rtc: drop owner assignment from platform_drivers
2014-10-20 16:21:31 +02:00
rtc-pcf2123.c
rtc: pcf2123: Add missing error code assignment before test
2016-08-31 18:21:34 +02:00
rtc-pcf2127.c
rtc: pcf2127: add pcf2129 device id
2016-03-14 17:08:41 +01:00
rtc-pcf8523.c
rtc: pcf8523: properly handle oscillator stop bit
2016-03-14 17:08:30 +01:00
rtc-pcf8563.c
rtc: pcf8563: fix output clock rate
2017-12-20 10:07:27 +01:00
rtc-pcf8583.c
rtc: Drop owner assignment from i2c_driver
2015-09-05 13:19:06 +02:00
rtc-pcf50633.c
rtc: constify rtc_class_ops structures
2016-09-02 01:24:06 +02:00
rtc-pcf85063.c
rtc: pcf85063: Add support for the PCF85063A device
2016-07-19 19:11:54 +02:00
rtc-pic32.c
rtc: pic32: Delete owner assignment
2016-08-31 18:21:35 +02:00
rtc-pl030.c
drivers/rtc/rtc-pl030.c: use devm_kzalloc() instead of kmalloc()
2013-11-13 12:09:31 +09:00
rtc-pl031.c
rtc: pl031: make interrupt optional
2017-12-25 14:23:43 +01:00
rtc-pm8xxx.c
rtc: rtc-pm8xxx: Add support for pm8018 rtc
2016-08-31 09:33:33 +01:00
rtc-proc.c
rtc: fix module reference count in rtc-proc
2016-01-11 20:19:55 +01:00
rtc-ps3.c
rtc: drop owner assignment from platform_drivers
2014-10-20 16:21:31 +02:00
rtc-puv3.c
rtc: drop owner assignment from platform_drivers
2014-10-20 16:21:31 +02:00
rtc-pxa.c
rtc: sa1100/pxa: convert to run-time register mapping
2015-09-05 19:37:16 +02:00
rtc-r9701.c
spi: Drop owner assignment from spi_drivers
2015-10-28 10:30:17 +09:00
rtc-rc5t583.c
rtc: explicitly set tm_sec = 0 for drivers with minute accurancy
2016-07-19 18:15:21 +02:00
rtc-rk808.c
rtc: rk808: Compensate for Rockchip calendar deviation on November 31st
2015-12-20 13:39:00 +01:00
rtc-rp5c01.c
rtc: rp5c01: clean up rp5c01_nvram_read()/rp5c01_nvram_write()
2015-09-05 13:19:10 +02:00
rtc-rs5c313.c
rtc: remove useless DRV_VERSION
2016-05-20 12:33:51 +02:00
rtc-rs5c348.c
rtc: remove useless DRV_VERSION
2016-05-20 12:33:51 +02:00
rtc-rs5c372.c
rtc: simplify implementations of read_alarm
2016-07-09 10:24:45 +02:00
rtc-rv3029c2.c
rtc: rv3029: hide unused i2c device table
2016-05-21 17:07:16 +02:00
rtc-rv8803.c
rtc: rv8803: set VDETOFF and SWOFF via device tree
2016-10-12 13:24:39 +02:00
rtc-rx4581.c
spi: Drop owner assignment from spi_drivers
2015-10-28 10:30:17 +09:00
rtc-rx6110.c
rtc: constify rtc_class_ops structures
2016-09-02 01:24:06 +02:00
rtc-rx8010.c
rtc: rx8010: change lock mechanism
2017-11-21 09:23:25 +01:00
rtc-rx8025.c
rtc: constify rtc_class_ops structures
2016-09-02 01:24:06 +02:00
rtc-rx8581.c
rtc: remove useless DRV_VERSION
2016-05-20 12:33:51 +02:00
rtc-s3c.c
rtc: s3c: Add s3c_rtc_{enable/disable}_clk in s3c_rtc_setfreq()
2016-07-19 17:48:06 +02:00
rtc-s3c.h
rtc: s3c: make header file local
2013-04-19 13:51:25 +02:00
rtc-s5m.c
rtc: s5m: De-inline large functions to save space
2016-03-14 17:08:18 +01:00
rtc-s35390a.c
rtc: s35390a: improve two comments in .set_alarm
2016-07-11 23:22:35 +02:00
rtc-sa1100.c
rtc: sa1100/pxa: convert to run-time register mapping
2015-09-05 19:37:16 +02:00
rtc-sa1100.h
rtc: sa1100/pxa: convert to run-time register mapping
2015-09-05 19:37:16 +02:00
rtc-sh.c
rtc: sh: don't validate alarm time provided to .set_alarm
2016-07-11 23:22:33 +02:00
rtc-sirfsoc.c
rtc: sirfsoc: move to regmap APIs from platform-specific APIs
2015-09-05 13:19:06 +02:00
rtc-snvs.c
rtc: snvs: return error in case enable_irq_wake fails
2016-05-20 12:33:51 +02:00
rtc-spear.c
rtc: constify rtc_class_ops structures
2016-09-02 01:24:06 +02:00
rtc-st-lpc.c
rtc: st: Update IP layout information to include Clocksource
2015-07-23 17:07:35 +01:00
rtc-starfire.c
rtc: drop owner assignment from platform_drivers
2014-10-20 16:21:31 +02:00
rtc-stk17ta8.c
rtc: remove useless DRV_VERSION
2016-05-20 12:33:51 +02:00
rtc-stmp3xxx.c
rtc: constify rtc_class_ops structures
2016-09-02 01:24:06 +02:00
rtc-sun4v.c
rtc: drop owner assignment from platform_drivers
2014-10-20 16:21:31 +02:00
rtc-sun6i.c
rtc: sun6i: Switch to the external oscillator
2017-03-12 06:41:52 +01:00
rtc-sunxi.c
rtc: sunxi: use of_device_get_match_data
2016-01-11 20:19:57 +01:00
rtc-sysfs.c
rtc: sysfs: fix a cast removing the const attribute
2016-08-31 18:21:35 +02:00
rtc-tegra.c
rtc: tegra: Implement clock handling
2017-04-21 09:31:24 +02:00
rtc-test.c
drivers/rtc/test: Update driver to address y2038/y2106 issues
2015-04-03 08:18:24 +02:00
rtc-tile.c
rtc: drop owner assignment from platform_drivers
2014-10-20 16:21:31 +02:00
rtc-tps6586x.c
rtc: tps6586x: rename so module can be autoloaded
2016-05-21 17:07:17 +02:00
rtc-tps65910.c
rtc: tps65910: Drop IRQF_EARLY_RESUME flag
2016-03-14 17:08:23 +01:00
rtc-tps80031.c
rtc: tps80031: Drop IRQF_EARLY_RESUME flag
2016-03-14 17:08:24 +01:00
rtc-twl.c
rtc: constify rtc_class_ops structures
2016-09-02 01:24:06 +02:00
rtc-tx4939.c
rtc: tx4939: clean up tx4939_rtc_nvram_read()/tx4939_rtc_nvram_write()
2015-09-05 13:19:10 +02:00
rtc-v3020.c
rtc: v3020: move rtc-v3020.h to platform_data
2016-07-09 10:24:21 +02:00
rtc-vr41xx.c
rtc: vr41xx: Wire up alarm_irq_enable
2016-03-14 17:08:25 +01:00
rtc-vt8500.c
rtc: Fix module autoload for OF platform drivers
2015-09-05 19:37:22 +02:00
rtc-wm831x.c
drivers/rtc/rtc-wm831x.c: remove empty function
2013-07-03 16:07:59 -07:00
rtc-wm8350.c
rtc: rtc-wm8350: switch to using SIMPLE_DEV_PM_OPS
2013-04-29 18:28:32 -07:00
rtc-x1205.c
rtc: remove useless DRV_VERSION
2016-05-20 12:33:51 +02:00
rtc-xgene.c
rtc: drop owner assignment from platform_drivers
2014-10-20 16:21:31 +02:00
rtc-zynqmp.c
rtc: zynqmp: Update seconds time programming logic
2016-05-20 12:33:51 +02:00
systohc.c
rtc: NTP: Add CONFIG_RTC_SYSTOHC_DEVICE for NTP synchronization
2015-06-25 01:13:42 +02:00