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linux/drivers/rtc
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Mateusz Jończyk 454f47ff46 rtc: cmos: take rtc_lock while reading from CMOS 
Reading from the CMOS involves writing to the index register and then
reading from the data register. Therefore access to the CMOS has to be
serialized with rtc_lock. This invocation of CMOS_READ was not
serialized, which could cause trouble when other code is accessing CMOS
at the same time.

Use spin_lock_irq() like the rest of the function.

Nothing in kernel modifies the RTC_DM_BINARY bit, so there could be a
separate pair of spin_lock_irq() / spin_unlock_irq() before doing the
math.

Signed-off-by: Mateusz Jończyk <mat.jonczyk@o2.pl>
Reviewed-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: stable@vger.kernel.org
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211210200131.153887-2-mat.jonczyk@o2.pl
2021-12-16 21:50:06 +01:00
..
class.c
rtc: expose RTC_FEATURE_UPDATE_INTERRUPT
2021-10-18 17:25:52 +02:00
dev.c
rtc: add BSM parameter
2021-10-18 17:20:50 +02:00
interface.c
rtc: handle alarms with a minute resolution
2021-11-10 00:45:56 +01:00
Kconfig
rtc: gamecube: Add a RTC driver for the GameCube, Wii and Wii U
2021-12-16 10:46:35 +01:00
lib_test.c
rtc: lib_test: add MODULE_LICENSE
2021-08-10 23:21:46 +02:00
lib.c
rtc: Improve performance of rtc_time64_to_tm(). Add tests.
2021-08-10 00:09:21 +02:00
Makefile
rtc: gamecube: Add a RTC driver for the GameCube, Wii and Wii U
2021-12-16 10:46:35 +01:00
nvmem.c
rtc: nvmem: emit an error message when nvmem registration fails
2020-11-19 12:50:12 +01:00
proc.c
rtc: fix snprintf() checking in is_rtc_hctosys()
2021-05-25 00:36:11 +02:00
rtc-88pm80x.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-88pm860x.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-ab8500.c
rtc: ab8500: let the core handle the alarm resolution
2021-11-10 00:45:57 +01:00
rtc-ab-b5ze-s3.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-ab-eoz9.c
rtc: ab-eoz9: support UIE when available
2021-11-10 00:45:57 +01:00
rtc-abx80x.c
rtc: abx80x: Add utility function for writing configuration key
2021-02-13 23:03:26 +01:00
rtc-ac100.c
rtc: ac100: use rtc_lock/rtc_unlock
2021-01-25 23:45:37 +01:00
rtc-armada38x.c
rtc: armada38x: remove armada38x_rtc_ops_noirq
2021-01-16 23:19:26 +01:00
rtc-as3722.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
2019-05-30 11:26:37 -07:00
rtc-asm9260.c
rtc: asm9260: use rtc_lock/rtc_unlock
2021-01-25 23:46:16 +01:00
rtc-aspeed.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-at91rm9200.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-at91sam9.c
rtc: at91sam9: Remove unnecessary offset variable checks
2021-07-10 02:42:08 +02:00
rtc-au1xxx.c
rtc: au1xxx: convert to SPDX identifier
2021-07-10 01:53:39 +02:00
rtc-bd70528.c
rtc: bd70528: Drop BD70528 support
2021-06-20 22:24:52 +02:00
rtc-bq32k.c
rtc: bq32k: quiet maybe-unused variable warning
2021-02-06 00:58:24 +01:00
rtc-bq4802.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
rtc-brcmstb-waketimer.c
rtc: brcmstb-waketimer: quiet maybe-unused variable warning
2021-02-06 00:58:24 +01:00
rtc-cadence.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-cmos.c
rtc: cmos: take rtc_lock while reading from CMOS
2021-12-16 21:50:06 +01:00
rtc-core.h
rtc: move rtc_add_group/s definitions
2018-09-28 14:20:59 +02:00
rtc-cpcap.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-cros-ec.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-da9052.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-da9055.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
rtc-da9063.c
rtc: da9063: add as wakeup source
2021-12-02 23:23:38 +01:00
rtc-davinci.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-digicolor.c
rtc: digicolor: quiet maybe-unused variable warning
2021-02-06 00:58:24 +01:00
rtc-dm355evm.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-ds1216.c
rtc: use devm_platform_ioremap_resource() to simplify code
2019-10-07 01:07:35 +02:00
rtc-ds1286.c
rtc: use devm_platform_ioremap_resource() to simplify code
2019-10-07 01:07:35 +02:00
rtc-ds1302.c
rtc: ds1302: Add SPI ID table
2021-09-25 23:22:28 +02:00
rtc-ds1305.c
rtc: ds1305: use rtc_lock/rtc_unlock
2021-01-25 23:46:16 +01:00
rtc-ds1307.c
rtc: ds1307: Fix wday settings for rx8130
2021-04-29 23:37:18 +02:00
rtc-ds1343.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-ds1347.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-ds1374.c
rtc: ds1374: convert to SPDX identifier
2021-07-10 01:53:39 +02:00
rtc-ds1390.c
rtc: ds1390: Add SPI ID table
2021-09-25 23:22:28 +02:00
rtc-ds1511.c
rtc: ds1511: remove unused function
2021-04-17 11:21:04 +02:00
rtc-ds1553.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-ds1672.c
rtc: ds1672: quiet maybe-unused variable warning
2021-02-06 00:58:24 +01:00
rtc-ds1685.c
rtc: ds1685: use rtc_lock/rtc_unlock
2021-01-25 23:46:17 +01:00
rtc-ds1742.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-ds2404.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-ds3232.c
rtc: ds3232: quiet maybe-unused variable warning
2021-02-06 00:58:24 +01:00
rtc-efi.c
rtc: efi: Remove the repeated module alias
2021-05-25 00:39:58 +02:00
rtc-em3027.c
rtc: em3027: correct month value
2019-11-08 16:14:09 +01:00
rtc-ep93xx.c
rtc: ep93xx: Fix NULL pointer dereference in ep93xx_rtc_read_time
2020-12-03 23:49:31 +01:00
rtc-fm3130.c
RTC for 5.3
2019-07-17 10:03:50 -07:00
rtc-fsl-ftm-alarm.c
rtc: fsl-ftm-alarm: add MODULE_TABLE()
2021-04-17 11:21:04 +02:00
rtc-ftrtc010.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-gamecube.c
rtc: gamecube: Report low battery as invalid data
2021-12-16 10:46:35 +01:00
rtc-generic.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
rtc-goldfish.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-hid-sensor-time.c
iio: hid-sensors: lighten exported symbols by moving to IIO_HID namespace
2021-06-16 14:53:13 +01:00
rtc-hym8563.c
rtc: hym8563: use rtc_lock/rtc_unlock
2021-01-25 23:46:17 +01:00
rtc-imx-sc.c
rtc: imx-sc: remove .read_alarm
2021-04-29 23:03:26 +02:00
rtc-imxdi.c
rtc: imxdi: add wakeup support
2021-05-25 00:41:25 +02:00
rtc-isl1208.c
rtc: isl1208: quiet maybe-unused variable warning
2021-02-06 00:58:24 +01:00
rtc-isl12022.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
rtc-isl12026.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-jz4740.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-lp8788.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
rtc-lpc24xx.c
rtc: remove unnecessary error message after platform_get_irq
2020-04-15 09:56:17 +02:00
rtc-lpc32xx.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-ls1x.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-m41t80.c
rtc: m41t80: return NULL rather than a plain 0 integer
2021-10-01 23:31:29 +02:00
rtc-m41t93.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
rtc-m41t94.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
rtc-m48t35.c
rtc: m48t35: remove SGI-IP27 kludge
2020-03-16 11:12:11 +01:00
rtc-m48t59.c
rtc: m48t59: use platform_get_irq_optional
2021-03-11 09:48:09 +01:00
rtc-m48t86.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-max6900.c
rtc: max6900: convert to SPDX identifier
2021-07-10 01:53:39 +02:00
rtc-max6902.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
rtc-max6916.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
rtc-max8907.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
rtc-max8925.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
rtc-max8997.c
rtc: max8997: Fix the returned value in case of error in 'max8997_rtc_read_alarm()'
2018-11-22 18:11:35 +01:00
rtc-max8998.c
rtc: maxim: Add SPDX license identifiers
2018-08-14 23:38:45 +02:00
rtc-max77686.c
rtc: max77686: Do not enforce (incorrect) interrupt trigger type
2021-06-20 22:22:13 +02:00
rtc-mc13xxx.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-mc146818-lib.c
rtc: mc146818: Dont test for bit 0-5 in Register D
2021-02-02 20:35:02 +01:00
rtc-mcp795.c
rtc: mcp795: Add SPI ID table
2021-10-01 23:28:28 +02:00
rtc-meson-vrtc.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-meson.c
rtc: meson: quiet maybe-unused variable warning
2021-02-06 00:58:24 +01:00
rtc-moxart.c
rtc: moxart: Convert to SPDX identifier
2019-12-23 11:23:49 +01:00
rtc-mpc5121.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-msc313.c
rtc: msc313: Fix unintentional sign extension issues with left shift of a u16
2021-10-01 23:28:46 +02:00
rtc-msm6242.c
rtc: msm6242: Remove unneeded msm6242_set()/msm6242_clear() functions
2019-11-18 15:23:54 +01:00
rtc-mt2712.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-mt6397.c
rtc: mt6397: refine RTC_TC_MTH
2021-06-01 16:44:09 +01:00
rtc-mt7622.c
rtc: use devm_platform_ioremap_resource() to simplify code
2019-10-07 01:07:35 +02:00
rtc-mv.c
rtc: mv: remove mv_rtc_alarm_ops
2021-01-16 23:19:26 +01:00
rtc-mxc_v2.c
rtc: mxc_v2: add missing MODULE_DEVICE_TABLE
2021-05-25 00:33:17 +02:00
rtc-mxc.c
rtc: mxc: Remove unneeded of_match_ptr()
2021-03-16 08:48:44 +01:00
rtc-ntxec.c
rtc: New driver for RTC in Netronix embedded controller
2021-03-10 11:06:33 +00:00
rtc-omap.c
rtc: omap: drop unneeded MODULE_ALIAS
2021-09-25 23:26:37 +02:00
rtc-opal.c
rtc: opal: constify opal_rtc_ops
2021-01-16 23:19:26 +01:00
rtc-palmas.c
rtc: palmas: convert to SPDX identifier
2021-07-10 01:53:39 +02:00
rtc-pcap.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-pcf2123.c
rtc: pcf2123: Add SPI ID table
2021-09-25 23:22:28 +02:00
rtc-pcf2127.c
rtc: pcf2127: handle timestamp interrupts
2021-07-10 02:58:31 +02:00
rtc-pcf8523.c
rtc: pcf8523: add BSM support
2021-10-18 17:38:06 +02:00
rtc-pcf8563.c
rtc: pcf8563: Fix the datasheet URL
2021-06-20 23:48:35 +02:00
rtc-pcf8583.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
rtc-pcf50633.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
rtc-pcf85063.c
rtc: pcf85063: add i2c_device_id name matching support
2021-12-01 00:07:25 +01:00
rtc-pcf85363.c
rtc: pcf85363: quiet maybe-unused variable warning
2021-02-06 00:58:25 +01:00
rtc-pic32.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-pl030.c
amba: Make the remove callback return void
2021-02-02 14:25:50 +01:00
rtc-pl031.c
ARM updates for 5.12-rc1:
2021-02-22 14:27:07 -08:00
rtc-pm8xxx.c
rtc: pm8xxx: Add RTC support for PMIC PMK8350
2021-04-17 00:20:01 +02:00
rtc-ps3.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-pxa.c
rtc: Remove dev_err() usage after platform_get_irq()
2019-08-13 10:53:10 +02:00
rtc-r7301.c
rtc: r7301: Replace spin_lock_irqsave with spin_lock in hard IRQ
2021-02-06 00:50:47 +01:00
rtc-r9701.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-rc5t583.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201
2019-05-30 11:29:52 -07:00
rtc-rc5t619.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-rk808.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-rp5c01.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-rs5c313.c
rtc: rtc-rs5c313: Convert to module_platform_driver()
2020-08-21 00:13:44 +02:00
rtc-rs5c348.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-rs5c372.c
rtc: rs5c372: Add RTC_VL_READ, RTC_VL_CLR ioctls
2021-12-01 00:05:42 +01:00
rtc-rtd119x.c
rtc: rtd119x: Fix format of SPDX identifier
2021-07-10 01:53:39 +02:00
rtc-rv3028.c
rtc: rv3028: add BSM support
2021-10-18 17:20:50 +02:00
rtc-rv3029c2.c
rtc: rv3029: quiet maybe-unused variable warning
2021-02-06 00:58:25 +01:00
rtc-rv3032.c
rtc: rv3032: let the core handle the alarm resolution
2021-11-10 00:45:57 +01:00
rtc-rv8803.c
rtc: rv8803: Add support for the Epson RX8804 RTC
2021-12-02 23:25:47 +01:00
rtc-rx4581.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
rtc-rx6110.c
rtc: rx6110: simplify getting the adapter of a client
2021-09-25 23:27:39 +02:00
rtc-rx8010.c
rtc: rx8010: quiet maybe-unused variable warning
2021-02-06 00:58:25 +01:00
rtc-rx8025.c
rtc: rx8025: use .set_offset/.read_offset
2021-11-10 00:45:57 +01:00
rtc-rx8581.c
rtc: rx8581: quiet maybe-unused variable warning
2021-02-06 00:58:25 +01:00
rtc-s3c.c
rtc: s3c: Add time range
2021-10-23 23:57:23 +02:00
rtc-s3c.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
rtc-s5m.c
rtc: s5m: drop unneeded MODULE_ALIAS
2021-09-25 23:26:37 +02:00
rtc-s35390a.c
rtc: s35390a: let the core handle the alarm resolution
2021-11-10 00:45:57 +01:00
rtc-sa1100.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
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: Fix format of SPDX identifier
2021-07-10 01:53:39 +02:00
rtc-sd3078.c
rtc: sd3078: quiet maybe-unused variable warning
2021-02-06 00:58:26 +01:00
rtc-sh.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-snvs.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-spear.c
rtc: spear: convert to SPDX identifier
2021-07-10 01:53:57 +02:00
rtc-st-lpc.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-starfire.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-stk17ta8.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-stm32.c
rtc: stm32: Fix unbalanced clk_disable_unprepare() on probe error path
2021-06-20 22:28:02 +02:00
rtc-stmp3xxx.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-sun4v.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-sun6i.c
rtc: sun6i: Allow probing without an early clock provider
2021-10-23 23:50:27 +02:00
rtc-sunxi.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-tegra.c
rtc: tegra: Replace spin_lock_irqsave with spin_lock in hard IRQ
2021-02-06 00:50:47 +01:00
rtc-test.c
rtc: test: remove debug message
2020-12-03 23:43:23 +01:00
rtc-tps6586x.c
rtc: tps6586x: convert to SPDX identifier
2021-07-10 01:53:40 +02:00
rtc-tps65910.c
rtc: tps65910: Correct driver module alias
2021-08-17 23:36:22 +02:00
rtc-twl.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
rtc-v3020.c
rtc: v3020: remove redundant initialization of variable retval
2021-06-20 22:29:50 +02:00
rtc-vr41xx.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-vt8500.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-wilco-ec.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-wm831x.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-wm8350.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
rtc-x1205.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
rtc-xgene.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
rtc-zynqmp.c
rtc: rework rtc_register_device() resource management
2020-11-19 12:50:12 +01:00
sysfs.c
rtc: sysfs: Correct kerneldoc function name hctosys_show()
2021-06-20 22:18:05 +02:00