Stewart Smith 99863c1bfd rtc-opal: Fix handling of firmware error codes, prevent busy loops ...

commit 5b8b58063029f02da573120ef4dc9079822e3cda 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 15:44:59 +01:00

..

class.c

rtc: switch to using is_visible() to control sysfs attributes

2015-09-05 13:19:07 +02:00

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 14:22:15 +01:00

Kconfig

rtc: Add a driver for Micro Crystal RV8803

2015-11-08 14:12:32 +01:00

Makefile

rtc: Add a driver for Micro Crystal RV8803

2015-11-08 14:12:32 +01:00

rtc-88pm80x.c

rtc: 88pm80x: add device tree support

2015-09-05 13:19:05 +02:00

rtc-88pm860x.c

…

rtc-ab3100.c

…

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: fix RTC write bit

2015-09-05 19:37:31 +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: correct month value

2015-09-05 19:37:18 +02:00

rtc-at32ap700x.c

rtc: at32ap700x: update author email

2015-06-25 01:12:50 +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

…

rtc-at91sam9.c

rtc: at91sam9: remove useless include

2015-09-05 13:19:13 +02:00

rtc-au1xxx.c

…

rtc-bfin.c

rtc: Drop (un)likely before IS_ERR(_OR_NULL)

2015-09-05 13:19:09 +02:00

rtc-bq32k.c

rtc: Drop owner assignment from i2c_driver

2015-09-05 13:19:06 +02:00

rtc-bq4802.c

…

rtc-cmos.c

rtc: cmos: clean up cmos_nvram_read()/cmos_nvram_write()

2015-09-05 13:19:09 +02:00

rtc-coh901331.c

rtc: Fix module autoload for OF platform drivers

2015-09-05 19:37:22 +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

drivers/rtc/rtc-da9052.c: register ability of alarm to wake device from suspend

2015-04-17 09:04:00 -04:00

rtc-da9055.c

…

rtc-da9063.c

rtc: da9063: fix access ordering error during RTC interrupt at system power on

2015-12-20 13:39:29 +01:00

rtc-davinci.c

rtc: davinci: remove incorrect reference to probe function

2015-11-08 14:12:29 +01:00

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: driver for Conexant Digicolor CX92755 on-chip RTC

2015-04-17 09:04:01 -04:00

rtc-dm355evm.c

…

rtc-ds1216.c

rtc: simplify use of devm_ioremap_resource

2015-06-25 01:13:40 +02:00

rtc-ds1286.c

rtc: simplify use of devm_ioremap_resource

2015-06-25 01:13:40 +02:00

rtc-ds1302.c

…

rtc-ds1305.c

spi: Drop owner assignment from spi_drivers

2015-10-28 10:30:17 +09:00

rtc-ds1307.c

rtc: ds1307: fix alarm reading at probe time

2015-11-26 18:11:26 +01:00

rtc-ds1343.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-ds1347.c

spi: Drop owner assignment from spi_drivers

2015-10-28 10:30:17 +09:00

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: ds1511: clean up ds1511_nvram_read()/ds1511_nvram_write()

2015-09-05 13:19:10 +02:00

rtc-ds1553.c

rtc: ds1553: clean up ds1553_nvram_read()/ds1553_nvram_write()

2015-09-05 13:19:10 +02:00

rtc-ds1672.c

rtc: ds1672, max6900, max8998: Add MODULE_DEVICE_TABLE

2015-06-25 01:13:36 +02:00

rtc-ds1685.c

rtc: ds1685: passing bogus values to irq_restore

2016-05-04 14:48:51 -07:00

rtc-ds1742.c

rtc: ds1742: clean up ds1742_nvram_read()/ds1742_nvram_write()

2015-09-05 13:19:10 +02:00

rtc-ds2404.c

…

rtc-ds3232.c

rtc: ds3232: fix WARNING trace in resume function

2015-09-05 19:36:21 +02:00

rtc-ds3234.c

spi: Drop owner assignment from spi_drivers

2015-10-28 10:30:17 +09:00

rtc-efi-platform.c

rtc: use more standard kernel logging styles

2015-04-17 09:04:02 -04:00

rtc-efi.c

rtc: efi: use correct EFI 'epoch'

2015-06-25 01:13:44 +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: ep93xx: Use readl/writel for io

2015-06-25 01:13:38 +02:00

rtc-fm3130.c

rtc: Drop owner assignment from i2c_driver

2015-09-05 13:19:06 +02:00

rtc-gemini.c

rtc: gemini: fix ptr_ret.cocci warnings

2015-09-05 13:19:09 +02:00

rtc-generic.c

…

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: fix invalid year calculation

2016-05-04 14:48:51 -07:00

rtc-imxdi.c

rtc: imxdi: when locked, do not fail silently

2015-06-19 20:03:21 +02:00

rtc-isl1208.c

rtc: isl1208: Pass the IRQF_ONESHOT flag

2015-11-08 14:12:30 +01:00

rtc-isl12022.c

rtc: Export OF module alias information in missing drivers

2015-09-05 13:19:08 +02:00

rtc-isl12057.c

rtc: isl12057: enable support for the standard "wakeup-source" property

2015-11-08 14:12:30 +01:00

rtc-jz4740.c

…

rtc-lib.c

…

rtc-lp8788.c

…

rtc-lpc24xx.c

rtc: add rtc-lpc24xx driver

2015-09-05 13:19:06 +02:00

rtc-lpc32xx.c

…

rtc-ls1x.c

MIPS: Loongson: Naming style cleanup and rework

2015-06-21 21:53:59 +02:00

rtc-m41t80.c

rtc: use more standard kernel logging styles

2015-04-17 09:04:02 -04:00

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-m48t59.c

rtc: m48t59: clean up m48t59_nvram_read()/m48t59_nvram_write()

2015-09-05 13:19:10 +02:00

rtc-m48t86.c

…

rtc-max6900.c

rtc: ds1672, max6900, max8998: Add MODULE_DEVICE_TABLE

2015-06-25 01:13:36 +02:00

rtc-max6902.c

spi: Drop owner assignment from spi_drivers

2015-10-28 10:30:17 +09:00

rtc-max8907.c

…

rtc-max8925.c

…

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: Properly handle regmap_irq_get_virq() error code

2016-05-04 14:48:52 -07:00

rtc-max77802.c

rtc: max77802: Report platform modalias to fix module autoload

2015-06-25 01:13:37 +02:00

rtc-mc13xxx.c

rtc: mc13xxx: fix obfuscated and wrong format string

2015-06-25 01:13:35 +02:00

rtc-mcp795.c

spi: Drop owner assignment from spi_drivers

2015-10-28 10:30:17 +09:00

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: remove use of seq_printf return value

2015-04-15 16:35:24 -07:00

rtc-msm6242.c

rtc: use more standard kernel logging styles

2015-04-17 09:04:02 -04:00

rtc-mt6397.c

rtc: Fix module autoload for OF platform drivers

2015-09-05 19:37:22 +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: add support of device tree

2015-08-05 20:03:56 +08:00

rtc-nuc900.c

…

rtc-omap.c

rtc: omap: Fix selecting external osc

2016-11-26 09:54:53 +01:00

rtc-opal.c

rtc-opal: Fix handling of firmware error codes, prevent busy loops

2018-02-22 15:44:59 +01:00

rtc-palmas.c

rtc: palmas: Initialise bb_charging flag before using it

2015-06-25 01:13:40 +02:00

rtc-pcap.c

…

rtc-pcf2123.c

spi: Drop owner assignment from spi_drivers

2015-10-28 10:30:17 +09:00

rtc-pcf2127.c

rtc: pcf2127: remove useless driver version

2015-11-08 14:12:28 +01:00

rtc-pcf8523.c

rtc: Drop owner assignment from i2c_driver

2015-09-05 13:19:06 +02:00

rtc-pcf8563.c

rtc: pcf8563: fix output clock rate

2017-12-20 10:04:57 +01:00

rtc-pcf8583.c

rtc: Drop owner assignment from i2c_driver

2015-09-05 13:19:06 +02:00

rtc-pcf50633.c

…

rtc-pcf85063.c

rtc: pcf85063: return an error when date is invalid

2015-11-08 14:12:26 +01:00

rtc-pl030.c

…

rtc-pl031.c

rtc: pl031: make interrupt optional

2017-12-25 14:22:14 +01:00

rtc-pm8xxx.c

…

rtc-proc.c

…

rtc-ps3.c

…

rtc-puv3.c

…

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-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-rs5c348.c

spi: Drop owner assignment from spi_drivers

2015-10-28 10:30:17 +09:00

rtc-rs5c372.c

…

rtc-rv3029c2.c

…

rtc-rv8803.c

rtc: Add a driver for Micro Crystal RV8803

2015-11-08 14:12:32 +01:00

rtc-rx4581.c

spi: Drop owner assignment from spi_drivers

2015-10-28 10:30:17 +09:00

rtc-rx8025.c

rtc: rx8025: remove rv8803 id

2016-05-04 14:48:52 -07:00

rtc-rx8581.c

rtc: Drop owner assignment from i2c_driver

2015-09-05 13:19:06 +02:00

rtc-s3c.c

rtc: s3c: Add s3c_rtc_{enable/disable}_clk in s3c_rtc_setfreq()

2016-08-20 18:09:27 +02:00

rtc-s3c.h

…

rtc-s5m.c

rtc: Fix module autoload for rtc-{ab8500,max8997,s5m} drivers

2015-09-05 19:37:21 +02:00

rtc-s35390a.c

rtc: s35390a: improve irq handling

2017-04-08 09:53:32 +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-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: use syscon to access register

2015-07-15 10:15:10 +08:00

rtc-spear.c

rtc: simplify use of devm_ioremap_resource

2015-06-25 01:13:40 +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-stk17ta8.c

rtc: stk17ta8: clean up stk17ta8_nvram_read()/stk17ta8_nvram_write()

2015-09-05 13:19:10 +02:00

rtc-stmp3xxx.c

rtc: stmp3xxx: unify register access macros

2015-11-08 14:12:27 +01:00

rtc-sun4v.c

…

rtc-sun6i.c

rtc: sun6i: Switch to the external oscillator

2017-03-12 06:37:30 +01:00

rtc-sunxi.c

rtc: sunxi: Replace deprecated rtc_tm_to_time()

2015-06-25 01:13:42 +02:00

rtc-sysfs.c

rtc: switch to using is_visible() to control sysfs attributes

2015-09-05 13:19:07 +02:00

rtc-tegra.c

rtc: tegra: Implement clock handling

2017-04-21 09:30:07 +02:00

rtc-test.c

…

rtc-tile.c

…

rtc-tps6586x.c

…

rtc-tps65910.c

…

rtc-tps80031.c

…

rtc-twl.c

rtc: use more standard kernel logging styles

2015-04-17 09:04:02 -04:00

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: rtc-v3020: use gpio_request_array()

2015-06-25 01:13:38 +02:00

rtc-vr41xx.c

rtc: vr41xx: Wire up alarm_irq_enable

2016-05-04 14:48:51 -07:00

rtc-vt8500.c

rtc: Fix module autoload for OF platform drivers

2015-09-05 19:37:22 +02:00

rtc-wm831x.c

…

rtc-wm8350.c

…

rtc-x1205.c

drivers/rtc/rtc-x1205.c: use sign_extend32() for sign extension

2015-04-17 09:03:59 -04:00

rtc-xgene.c

…

rtc-zynqmp.c

rtc: add xilinx zynqmp rtc driver

2015-09-05 19:37:19 +02:00

systohc.c

rtc: NTP: Add CONFIG_RTC_SYSTOHC_DEVICE for NTP synchronization

2015-06-25 01:13:42 +02:00