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561f8281cf
linux/drivers/rtc
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Philipp Rossak 561f8281cf rtc: ac100: Fix ac100 determine rate bug 
This patch fixes a bug, that prevents the Allwinner A83T and the A80
from a successful boot.

The bug is there since v4.16-rc1 and appeared after the clk branch was
merged.

You can find the shortend trace below:

Unable to handle kernel NULL pointer dereference at virtual address
00000000
pgd = (ptrval)
[00000000] *pgd=00000000
Internal error: Oops: 5 [#1] SMP ARM
Modules linked in:
CPU: 0 PID: 49 Comm: kworker/0:1 Not tainted 4.15.0-10190-gb89e32ccd1be #2
Hardware name: Allwinner sun8i Family
Workqueue: events deferred_probe_work_func
PC is at clk_hw_get_rate+0x0/0x34
LR is at ac100_clkout_determine_rate+0x48/0x19c

[ ... ]

(clk_hw_get_rate) from (ac100_clkout_determine_rate+0x48/0x19c)
(ac100_clkout_determine_rate) from  (clk_core_set_rate_nolock+0x3c/0x1a0)
(clk_core_set_rate_nolock) from (clk_set_rate+0x30/0x88)
(clk_set_rate) from (of_clk_set_defaults+0x200/0x364)
(of_clk_set_defaults) from (platform_drv_probe+0x18/0xb0)

To fix that bug, we first check if the return of the
clk_hw_get_parent_by_index is non zero. If it is zero we skip that
clock parent.

The BUG report could be found here: https://lkml.org/lkml/2018/2/10/198

Fixes: 04940631b8 ("rtc: ac100: Add clk output support")

Signed-off-by: Philipp Rossak <embed3d@gmail.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2018-03-17 14:20:50 +01:00
..
class.c rtc: remove nvmem_config 2018-03-01 10:49:23 +01:00
hctosys.c
interface.c rtc: Add tracepoints for RTC system 2018-02-13 21:30:22 +01:00
Kconfig rtc: tx4939: extend test coverage 2018-03-01 10:49:34 +01:00
Makefile rtc: remove rtc-at32ap700x 2018-01-19 09:59:32 +01:00
nvmem.c rtc: export rtc_nvmem_register() to drivers 2018-03-01 10:49:15 +01:00
rtc-88pm80x.c
rtc-88pm860x.c
rtc-ab3100.c rtc: stop validating rtc_time after rtc_time64_to_tm 2018-03-01 10:49:41 +01:00
rtc-ab8500.c rtc: stop validating rtc_time after rtc_time_to_tm 2018-03-01 10:49:41 +01:00
rtc-ab-b5ze-s3.c rtc: ab-b5ze-s3: stop validating rtc_time in .read_time 2018-03-02 10:09:59 +01:00
rtc-abx80x.c rtc: abx80x: remove useless message 2018-03-02 10:12:23 +01:00
rtc-ac100.c rtc: ac100: Fix ac100 determine rate bug 2018-03-17 14:20:50 +01:00
rtc-armada38x.c rtc: armada38x: add support for trimming the RTC 2017-10-25 23:05:52 +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-at91rm9200.c rtc: at91rm9200: fix reading alarm value 2017-11-10 16:24:32 +01:00
rtc-at91rm9200.h
rtc-at91sam9.c rtc: at91sam9: Fix missing spin_lock_init() 2016-07-26 00:09:18 +02:00
rtc-au1xxx.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-bfin.c rtc: constify rtc_class_ops structures 2017-01-11 17:23:06 +01:00
rtc-bq32k.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-bq4802.c
rtc-brcmstb-waketimer.c rtc: brcmstb-waketimer: fix error handling in brcmstb_waketmr_probe() 2017-11-29 22:11:13 +01:00
rtc-cmos.c rtc: cmos: let the core handle invalid time 2018-03-01 10:49:39 +01:00
rtc-coh901331.c rtc: stop validating rtc_time after rtc_time_to_tm 2018-03-01 10:49:41 +01:00
rtc-core.h rtc: export rtc_nvmem_register() to drivers 2018-03-01 10:49:15 +01:00
rtc-cpcap.c rtc: cpcap: stop validating rtc_time in .read_time 2018-03-02 10:09:59 +01:00
rtc-cros-ec.c rtc: cros-ec: add cros-ec-rtc driver. 2017-12-18 23:05:10 +01:00
rtc-da9052.c rtc: diasemi: stop validating rtc_time in .read_time 2018-03-02 10:11:02 +01:00
rtc-da9055.c rtc: diasemi: stop validating rtc_time in .read_time 2018-03-02 10:11:02 +01:00
rtc-da9063.c rtc: diasemi: stop validating rtc_time in .read_time 2018-03-02 10:11:02 +01:00
rtc-davinci.c rtc: constify rtc_class_ops structures 2016-09-02 01:24:06 +02:00
rtc-dev.c vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
rtc-digicolor.c rtc: constify rtc_class_ops structures 2016-09-02 01:24:06 +02:00
rtc-dm355evm.c mfd: dm355evm_msp: Move header file out of I2C realm 2017-08-15 08:06:14 +01:00
rtc-ds1216.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-ds1286.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-ds1302.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-ds1305.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-ds1307.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-ds1343.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-ds1347.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-ds1374.c rtc: ds1374: wdt: Fix stop/start ioctl always returning -EINVAL 2017-05-04 14:46:25 +02:00
rtc-ds1390.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-ds1511.c rtc: ds1511: let the core handle invalid time 2018-03-01 10:49:38 +01:00
rtc-ds1553.c rtc: ds1553: let the core handle invalid time 2018-03-01 10:49:39 +01:00
rtc-ds1672.c rtc: constify i2c_device_id 2017-09-01 01:10:11 +02:00
rtc-ds1685.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-ds1742.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-ds2404.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-ds3232.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-efi-platform.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
rtc-efi.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-em3027.c rtc: constify i2c_device_id 2017-09-01 01:10:11 +02:00
rtc-ep93xx.c rtc: remove useless DRV_VERSION 2016-05-20 12:33:51 +02:00
rtc-fm3130.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-ftrtc010.c rtc: gemini/ftrtc010: rename driver and symbols 2017-07-06 22:37:15 +02:00
rtc-generic.c rtc: generic: remove get_rtc_time/set_rtc_time wrappers 2016-06-04 00:23:35 +02:00
rtc-goldfish.c rtc: goldfish: Add missing MODULE_LICENSE 2018-02-13 21:46:04 +01:00
rtc-hid-sensor-time.c rtc: hid-sensor-time: remove some dead code 2017-04-22 17:56:18 +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 sched/wait: Disambiguate wq_entry->task_list and wq_head->task_list naming 2017-06-20 12:19:14 +02:00
rtc-isl1208.c rtc: isl1208: Fix unintended clear of SR bits 2018-03-01 10:49:36 +01:00
rtc-isl12022.c rtc: isl12022: remove useless indirection 2018-03-02 10:12:19 +01:00
rtc-jz4740.c rtc: stop validating rtc_time after rtc_time_to_tm 2018-03-01 10:49:41 +01:00
rtc-lib.c rtc: Fix overflow when converting time64_t to rtc_time 2018-02-13 21:30:28 +01:00
rtc-lp8788.c
rtc-lpc24xx.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-lpc32xx.c rtc: stop validating rtc_time after rtc_time_to_tm 2018-03-01 10:49:41 +01:00
rtc-ls1x.c rtc: stop validating rtc_time after rtc_time_to_tm 2018-03-01 10:49:41 +01:00
rtc-m41t80.c rtc: m41t80: remove useless indirection 2018-03-17 14:20:48 +01:00
rtc-m41t93.c rtc: m41t93: stop validating rtc_time in .read_time 2018-03-02 10:12:19 +01:00
rtc-m41t94.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-m48t35.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-m48t59.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-m48t86.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-max6900.c rtc: max6900: remove useless indirection 2018-03-17 14:20:46 +01:00
rtc-max6902.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-max6916.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-max8907.c
rtc-max8925.c rtc: max8925: remove redundant check on ret 2017-07-31 00:17:48 +02:00
rtc-max8997.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-max8998.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-max77686.c rtc: max77686: stop validating rtc_time in .read_time 2018-03-02 10:12:20 +01:00
rtc-mc13xxx.c rtc: stop validating rtc_time after rtc_time64_to_tm 2018-03-01 10:49:41 +01:00
rtc-mc146818-lib.c rtc: move mc146818 helper functions out-of-line 2016-06-26 01:20:08 +02:00
rtc-mcp795.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-moxart.c rtc: Fix module autoload for OF platform drivers 2015-09-05 19:37:22 +02:00
rtc-mpc5121.c rtc: stop validating rtc_time after rtc_time_to_tm 2018-03-01 10:49:41 +01:00
rtc-mrst.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-msm6242.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-mt6397.c rtc: constify rtc_class_ops structures 2016-09-02 01:24:06 +02:00
rtc-mt7622.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-mv.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-mxc_v2.c rtc: mxc_v2: Fix _iomem pointer notation 2018-03-01 10:49:36 +01:00
rtc-mxc.c rtc: mxc: avoid disabling interrupts on device close 2017-08-24 16:23:16 +02:00
rtc-nuc900.c rtc: nuc900: stop validating rtc_time in .read_time 2018-03-02 10:12:17 +01:00
rtc-omap.c rtc: omap: stop validating rtc_time in .set_time and .set_alarm 2018-03-02 10:12:21 +01:00
rtc-opal.c rtc-opal: Fix handling of firmware error codes, prevent busy loops 2018-01-27 21:15:59 +11:00
rtc-palmas.c rtc: constify rtc_class_ops structures 2016-09-02 01:24:06 +02:00
rtc-pcap.c rtc: stop validating rtc_time after rtc_time_to_tm 2018-03-01 10:49:41 +01:00
rtc-pcf2123.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-pcf2127.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-pcf8523.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-pcf8563.c rtc: pcf8563: don't alway enable the alarm 2017-11-09 01:16:36 +01:00
rtc-pcf8583.c
rtc-pcf50633.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-pcf85063.c rtc: pcf85063: remove useless indirection 2018-03-17 14:20:47 +01:00
rtc-pcf85363.c rtc: pcf85363: set time accurately 2018-03-17 14:20:49 +01:00
rtc-pic32.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-pl030.c
rtc-pl031.c rtc: pl031: make interrupt optional 2017-10-12 16:30:30 +02:00
rtc-pm8xxx.c rtc: pm8xxx: remove useless message 2018-03-02 10:12:23 +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: stop validating rtc_time after rtc_time_to_tm 2018-03-01 10:49:41 +01:00
rtc-puv3.c rtc: puv3: make alarms useful 2017-08-22 12:05:21 +02:00
rtc-pxa.c rtc: pxa: fix possible race condition 2017-08-24 11:03:34 +02:00
rtc-r7301.c rtc: r7301: stop validating rtc_time in .read_time 2018-03-02 10:12:18 +01:00
rtc-r9701.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
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: fix possible race condition 2018-03-17 14:20:42 +01:00
rtc-rp5c01.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-rs5c313.c rtc: remove useless DRV_VERSION 2016-05-20 12:33:51 +02:00
rtc-rs5c348.c rtc: rs5c348: let the core handle invalid time 2018-03-01 10:49:40 +01:00
rtc-rs5c372.c rtc: rs5c372: remove useless indirection 2018-03-17 14:20:45 +01:00
rtc-rtd119x.c rtc: Add Realtek RTD1295 2017-09-05 09:55:02 +02:00
rtc-rv3029c2.c rtc: rv3029: Clean up error handling in rv3029_eeprom_write() 2017-10-12 16:24:19 +02:00
rtc-rv8803.c rtc: rv8803: fix possible race condition 2018-03-01 10:49:23 +01:00
rtc-rx4581.c rtc: rx4581: remove useless message 2018-03-02 10:12:24 +01:00
rtc-rx6110.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-rx8010.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-rx8025.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-rx8581.c rtc: rx8581: remove useless message 2018-03-02 10:12:24 +01:00
rtc-s3c.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-s3c.h
rtc-s5m.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-s35390a.c rtc: s35390a: remove useless indirection 2018-03-17 14:20:44 +01:00
rtc-sa1100.c rtc: sa1100: make alarms useful 2017-08-24 11:03:35 +02:00
rtc-sa1100.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
rtc-sc27xx.c rtc: sc27xx: stop validating rtc_time in .read_time 2018-03-02 10:12:18 +01:00
rtc-sh.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-sirfsoc.c rtc: sirfsoc: remove useless sirfsoc_rtc_ioctl 2018-03-01 10:49:27 +01:00
rtc-snvs.c rtc: snvs: fix an incorrect check of return value 2017-05-05 00:43:50 +02:00
rtc-spear.c rtc: spear: stop validating rtc_time in .set_time and .set_alarm 2018-03-02 10:12:21 +01:00
rtc-st-lpc.c rtc: st-lpc: make it robust against y2038/2106 bug 2017-07-09 22:32:18 +02:00
rtc-starfire.c rtc: stop validating rtc_time after rtc_time_to_tm 2018-03-01 10:49:41 +01:00
rtc-stk17ta8.c rtc: stk17ta8: let the core handle invalid time 2018-03-01 10:49:40 +01:00
rtc-stm32.c rtc: stm32: Fix copyright 2017-11-29 22:20:56 +01:00
rtc-stmp3xxx.c rtc: constify rtc_class_ops structures 2016-09-02 01:24:06 +02:00
rtc-sun4v.c rtc: sparc: make sun4v explicitly non-modular 2016-11-04 23:31:33 +01:00
rtc-sun6i.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-sunxi.c rtc: stop validating rtc_time in .read_time 2018-03-02 10:09:58 +01:00
rtc-sysfs.c rtc: sysfs: Use time64_t variables to set time/alarm 2017-11-10 09:57:38 +01:00
rtc-tegra.c rtc: tegra: stop validating rtc_time in .set_time 2018-03-02 10:12:22 +01:00
rtc-test.c
rtc-tile.c
rtc-tps6586x.c rtc: stop validating rtc_time after rtc_time_to_tm 2018-03-01 10:49:41 +01:00
rtc-tps65910.c rtc: tps65910: use 'unsigned int' instead of 'unsigned' in arguments 2017-01-10 01:32:51 +01:00
rtc-tps80031.c rtc: tps80031: Drop IRQF_EARLY_RESUME flag 2016-03-14 17:08:24 +01:00
rtc-twl.c mfd: twl: Move header file out of I2C realm 2017-09-04 14:41:02 +01:00
rtc-tx4939.c rtc: stop validating rtc_time after rtc_time_to_tm 2018-03-01 10:49:41 +01:00
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: make alarms useful 2017-08-24 11:03:36 +02:00
rtc-vt8500.c rtc: Fix module autoload for OF platform drivers 2015-09-05 19:37:22 +02:00
rtc-wm831x.c rtc: stop validating rtc_time after rtc_time_to_tm 2018-03-01 10:49:41 +01:00
rtc-wm8350.c rtc: wm8350: Remove unused to_wm8350_from_rtc_dev 2017-03-16 22:59:54 +01:00
rtc-x1205.c rtc: remove useless DRV_VERSION 2016-05-20 12:33:51 +02:00
rtc-xgene.c rtc: stop validating rtc_time after rtc_time_to_tm 2018-03-01 10:49:41 +01:00
rtc-zynqmp.c rtc: stop validating rtc_time after rtc_time64_to_tm 2018-03-01 10:49:41 +01:00
systohc.c rtc: Allow rtc drivers to specify the tv_nsec value for ntp 2017-10-30 15:03:24 -07:00