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twx-linux/drivers/rtc
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Dmitry Torokhov 79f1a5b17b rtc: cmos: avoid taking rtc_lock for extended period of time 
[ Upstream commit 0a6efab33eab4e973db26d9f90c3e97a7a82e399 ]

On my device reading entirety of /sys/devices/pnp0/00:03/cmos_nvram0/nvmem
takes about 9 msec during which time interrupts are off on the CPU that
does the read and the thread that performs the read can not be migrated
or preempted by another higher priority thread (RT or not).

Allow readers and writers be preempted by taking and releasing rtc_lock
spinlock for each individual byte read or written rather than once per
read/write request.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Reviewed-by: Mateusz Jończyk <mat.jonczyk@o2.pl>
Link: https://lore.kernel.org/r/Zxv8QWR21AV4ztC5@google.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-12-14 20:00:16 +01:00
..
class.c driver core: class: remove module * from class_create() 2023-03-17 15:16:33 +01:00
dev.c
interface.c rtc: check if __rtc_read_time was successful in rtc_timer_do_work() 2024-12-09 10:32:55 +01:00
Kconfig rtc: mt6397: select IRQ_DOMAIN instead of depending on it 2024-03-26 18:20:06 -04:00
lib_test.c rtc: test: Fix invalid format specifier. 2024-03-26 18:19:18 -04:00
lib.c
Makefile rtc: Add rtc driver for the Loongson family chips 2023-06-26 01:19:11 +02:00
nvmem.c nvmem: add explicit config option to read old syntax fixed OF cells 2024-05-17 12:01:55 +02:00
proc.c
rtc-88pm80x.c rtc: 88pm80x: Convert to platform remove callback returning void 2023-03-17 23:03:16 +01:00
rtc-88pm860x.c rtc: 88pm860x: Convert to platform remove callback returning void 2023-03-17 23:03:16 +01:00
rtc-ab8500.c rtc: ab8500: Convert to platform remove callback returning void 2023-03-17 23:03:16 +01:00
rtc-ab-b5ze-s3.c rtc: Switch i2c drivers back to use .probe() 2023-06-06 23:29:37 +02:00
rtc-ab-eoz9.c rtc: ab-eoz9: don't fail temperature reads on undervoltage notification 2024-12-09 10:32:57 +01:00
rtc-abx80x.c rtc: abx80x: Fix WDT bit position of the status register 2024-12-09 10:32:55 +01:00
rtc-ac100.c rtc: ac100: Convert to platform remove callback returning void 2023-03-17 23:03:17 +01:00
rtc-armada38x.c rtc: remove redundant of_match_ptr() 2023-08-10 09:45:41 +02:00
rtc-as3722.c
rtc-asm9260.c rtc: asm9260: Convert to platform remove callback returning void 2023-03-17 23:03:17 +01:00
rtc-aspeed.c rtc: remove redundant of_match_ptr() 2023-08-10 09:45:41 +02:00
rtc-at91rm9200.c rtc: remove redundant of_match_ptr() 2023-08-10 09:45:41 +02:00
rtc-at91sam9.c rtc: at91sam9: fix OF node leak in probe() error path 2024-10-10 11:57:57 +02:00
rtc-au1xxx.c
rtc-bd70528.c
rtc-bq32k.c rtc: Switch i2c drivers back to use .probe() 2023-06-06 23:29:37 +02:00
rtc-bq4802.c
rtc-brcmstb-waketimer.c rtc: brcmstb-waketimer: support level alarm_irq 2023-11-20 11:59:30 +01:00
rtc-cadence.c rtc: cadence: Convert to platform remove callback returning void 2023-03-17 23:03:17 +01:00
rtc-cmos.c rtc: cmos: avoid taking rtc_lock for extended period of time 2024-12-14 20:00:16 +01:00
rtc-core.h
rtc-cpcap.c
rtc-cros-ec.c rtc: cros-ec: Detect and report supported alarm window size 2023-08-27 23:50:22 +02:00
rtc-da9052.c
rtc-da9055.c
rtc-da9063.c rtc: da9063: Mark the alarm IRQ as a wake IRQ 2023-08-17 01:09:50 +02:00
rtc-digicolor.c
rtc-ds1216.c
rtc-ds1286.c
rtc-ds1302.c
rtc-ds1305.c rtc: ds1305: Report maximum alarm limit to rtc core 2023-08-27 23:50:22 +02:00
rtc-ds1307.c rtc: ds1307: fix Wvoid-pointer-to-enum-cast warning 2023-08-16 01:32:08 +02:00
rtc-ds1343.c
rtc-ds1347.c
rtc-ds1374.c rtc: Switch i2c drivers back to use .probe() 2023-06-06 23:29:37 +02:00
rtc-ds1390.c rtc: ds1390: mark OF related data as maybe unused 2023-03-17 23:23:22 +01:00
rtc-ds1511.c
rtc-ds1553.c
rtc-ds1672.c rtc: Switch i2c drivers back to use .probe() 2023-06-06 23:29:37 +02:00
rtc-ds1685.c rtc: ds1685: use EXPORT_SYMBOL_GPL for ds1685_rtc_poweroff 2023-08-02 11:18:22 -07:00
rtc-ds1742.c rtc: Explicitly include correct DT includes 2023-07-27 23:31:29 +02:00
rtc-ds2404.c rtc: ds2404: Convert to GPIO descriptors 2023-08-17 00:55:56 +02:00
rtc-ds3232.c rtc: Switch i2c drivers back to use .probe() 2023-06-06 23:29:37 +02:00
rtc-efi.c rtc: efi: Avoid spamming the log on RTC read failure 2023-02-22 21:07:53 +01:00
rtc-em3027.c rtc: Switch i2c drivers back to use .probe() 2023-06-06 23:29:37 +02:00
rtc-ep93xx.c
rtc-fm3130.c rtc: Switch i2c drivers back to use .probe() 2023-06-06 23:29:37 +02:00
rtc-fsl-ftm-alarm.c rtc: Explicitly include correct DT includes 2023-07-27 23:31:29 +02:00
rtc-ftrtc010.c rtc: ftrtc010: Convert to platform remove callback returning void 2023-03-17 23:03:17 +01:00
rtc-gamecube.c
rtc-generic.c
rtc-goldfish.c
rtc-hid-sensor-time.c rtc: hid-sensor-time: Convert to platform remove callback returning void 2023-03-17 23:03:17 +01:00
rtc-hym8563.c rtc: Switch i2c drivers back to use .probe() 2023-06-06 23:29:37 +02:00
rtc-imx-sc.c
rtc-imxdi.c
rtc-isl1208.c rtc: isl1208: Fix return value of nvmem callbacks 2024-08-03 08:54:29 +02:00
rtc-isl12022.c rtc: isl12022: implement support for the #clock-cells DT property 2023-08-16 01:27:01 +02:00
rtc-isl12026.c rtc: isl12026: Drop "_new" from probe callback name 2023-07-27 23:32:08 +02:00
rtc-jz4740.c rtc: jz4740: fix Wvoid-pointer-to-enum-cast warning 2023-08-16 01:32:08 +02:00
rtc-loongson.c rtc: Add rtc driver for the Loongson family chips 2023-06-26 01:19:11 +02:00
rtc-lp8788.c
rtc-lpc24xx.c rtc: Explicitly include correct DT includes 2023-07-27 23:31:29 +02:00
rtc-lpc32xx.c
rtc-m41t80.c rtc: Explicitly include correct DT includes 2023-07-27 23:31:29 +02:00
rtc-m41t93.c
rtc-m41t94.c
rtc-m48t35.c
rtc-m48t59.c
rtc-m48t86.c rtc: m48t86: add DT support for m48t86 2023-08-28 00:01:51 +02:00
rtc-max6900.c rtc: Switch i2c drivers back to use .probe() 2023-06-06 23:29:37 +02:00
rtc-max6902.c
rtc-max6916.c
rtc-max8907.c rtc: max8907: Drop unused i2c include 2023-02-01 09:13:35 +01:00
rtc-max8925.c
rtc-max8997.c
rtc-max8998.c
rtc-max77686.c rtc: max77686: Convert to platform remove callback returning void 2023-03-17 23:03:17 +01:00
rtc-mc13xxx.c rtc: mc13xxx: Convert to platform remove callback returning void 2023-03-17 23:03:17 +01:00
rtc-mc146818-lib.c rtc: Extend timeout for waiting for UIP to clear to 1s 2024-01-31 16:18:56 -08:00
rtc-mcp795.c
rtc-meson-vrtc.c rtc: meson-vrtc: Use ktime_get_real_ts64() to get the current time 2023-03-21 21:15:10 +01:00
rtc-meson.c
rtc-moxart.c rtc: moxart: switch to using gpiod API 2023-02-09 23:31:46 +01:00
rtc-mpc5121.c rtc: Explicitly include correct DT includes 2023-07-27 23:31:29 +02:00
rtc-mpfs.c rtc: mpfs: Convert to platform remove callback returning void 2023-03-17 23:03:17 +01:00
rtc-msc313.c rtc: msc313: Fix function prototype mismatch in msc313_rtc_probe() 2022-12-11 18:14:01 +01:00
rtc-msm6242.c
rtc-mt2712.c
rtc-mt6397.c rtc: Explicitly include correct DT includes 2023-07-27 23:31:29 +02:00
rtc-mt7622.c rtc: Explicitly include correct DT includes 2023-07-27 23:31:29 +02:00
rtc-mv.c
rtc-mxc_v2.c rtc: mxc_v2: Convert to platform remove callback returning void 2023-03-17 23:03:17 +01:00
rtc-mxc.c rtc: Explicitly include correct DT includes 2023-07-27 23:31:29 +02:00
rtc-nct3018y.c rtc: nct3018y: fix possible NULL dereference 2024-08-29 17:33:39 +02:00
rtc-ntxec.c
rtc-nxp-bbnsm.c rtc: bbnsm: Add the bbnsm rtc support 2023-02-22 12:25:32 +01:00
rtc-omap.c rtc: omap: Do not check for 0 return after calling platform_get_irq() 2023-08-17 01:17:34 +02:00
rtc-opal.c
rtc-optee.c
rtc-palmas.c rtc: palmas: Convert to platform remove callback returning void 2023-03-17 23:03:17 +01:00
rtc-pcap.c
rtc-pcf2123.c rtc: pcf2123: use IRQ flags obtained from fwnode 2023-02-01 09:13:35 +01:00
rtc-pcf2127.c rtc: pcf2127: remove useless check 2023-08-27 23:53:06 +02:00
rtc-pcf8523.c rtc: Switch i2c drivers back to use .probe() 2023-06-06 23:29:37 +02:00
rtc-pcf8563.c rtc: Switch i2c drivers back to use .probe() 2023-06-06 23:29:37 +02:00
rtc-pcf8583.c rtc: Switch i2c drivers back to use .probe() 2023-06-06 23:29:37 +02:00
rtc-pcf50633.c rtc: pcf50633: Convert to platform remove callback returning void 2023-03-17 23:03:18 +01:00
rtc-pcf85063.c rtc: Explicitly include correct DT includes 2023-07-27 23:31:29 +02:00
rtc-pcf85363.c rtc: pcf85363: fix wrong mask/val parameters in regmap_update_bits call 2023-11-20 11:59:30 +01:00
rtc-pic32.c rtc: pic32: Convert to platform remove callback returning void 2023-03-17 23:03:18 +01:00
rtc-pl030.c
rtc-pl031.c
rtc-pm8xxx.c rtc: pm8xxx: Convert to platform remove callback returning void 2023-03-17 23:03:18 +01:00
rtc-ps3.c
rtc-pxa.c rtc: Explicitly include correct DT includes 2023-07-27 23:31:29 +02:00
rtc-r7301.c
rtc-r9701.c
rtc-rc5t583.c rtc: rc5t583: Convert to platform remove callback returning void 2023-03-17 23:03:18 +01:00
rtc-rc5t619.c
rtc-rk808.c rtc: rk808: reduce 'struct rk808' usage 2022-12-11 20:56:33 +01:00
rtc-rp5c01.c
rtc-rs5c313.c rtc: rs5c313: correct some spelling mistakes 2022-12-15 23:34:31 +01:00
rtc-rs5c348.c
rtc-rs5c372.c rtc: rs5c372: fix Wvoid-pointer-to-enum-cast warning 2023-08-16 01:32:08 +02:00
rtc-rtd119x.c rtc: rtd119x: Convert to platform remove callback returning void 2023-03-17 23:03:18 +01:00
rtc-rv3028.c rtc: Explicitly include correct DT includes 2023-07-27 23:31:29 +02:00
rtc-rv3029c2.c rtc: Switch i2c drivers back to use .probe() 2023-06-06 23:29:37 +02:00
rtc-rv3032.c rtc: Explicitly include correct DT includes 2023-07-27 23:31:29 +02:00
rtc-rv8803.c rtc: rv8803: fix Wvoid-pointer-to-enum-cast warning 2023-08-16 01:32:08 +02:00
rtc-rx4581.c
rtc-rx6110.c rtc: Explicitly include correct DT includes 2023-07-27 23:31:29 +02:00
rtc-rx8010.c rtc: Switch i2c drivers back to use .probe() 2023-06-06 23:29:37 +02:00
rtc-rx8025.c rtc: Switch i2c drivers back to use .probe() 2023-06-06 23:29:37 +02:00
rtc-rx8581.c rtc: Explicitly include correct DT includes 2023-07-27 23:31:29 +02:00
rtc-rzn1.c rtc: rzn1: fix BCD to rtc_time conversion errors 2024-12-09 10:32:56 +01:00
rtc-s3c.c rtc: Explicitly include correct DT includes 2023-07-27 23:31:29 +02:00
rtc-s3c.h
rtc-s5m.c rtc: s5m: Drop S5M8763 support 2023-04-26 11:40:26 +01:00
rtc-s35390a.c rtc: Switch i2c drivers back to use .probe() 2023-06-06 23:29:37 +02:00
rtc-sa1100.c rtc: sa1100: Convert to platform remove callback returning void 2023-03-17 23:03:18 +01:00
rtc-sa1100.h
rtc-sc27xx.c
rtc-sd3078.c rtc: Switch i2c drivers back to use .probe() 2023-06-06 23:29:37 +02:00
rtc-sh.c
rtc-snvs.c rtc: snvs: Allow a time difference on clock register read 2022-11-15 21:25:44 +01:00
rtc-spear.c rtc: spear: Convert to platform remove callback returning void 2023-03-17 23:03:18 +01:00
rtc-st-lpc.c rtc: st-lpc: Use IRQF_NO_AUTOEN flag in request_irq() 2024-12-09 10:32:55 +01:00
rtc-starfire.c
rtc-stk17ta8.c
rtc-stm32.c rtc: stm32: Use NOIRQ_SYSTEM_SLEEP_PM_OPS() 2023-08-17 00:53:00 +02:00
rtc-stmp3xxx.c rtc: Explicitly include correct DT includes 2023-07-27 23:31:29 +02:00
rtc-sun4v.c
rtc-sun6i.c rtc: sun6i: remove unnecessary message 2023-09-06 01:26:04 +02:00
rtc-sunplus.c rtc: sunplus: Clean up redundant dev_err_probe() 2023-08-10 09:35:28 +02:00
rtc-sunxi.c rtc: Explicitly include correct DT includes 2023-07-27 23:31:29 +02:00
rtc-tegra.c rtc: tegra: Convert to platform remove callback returning void 2023-03-17 23:03:18 +01:00
rtc-test.c
rtc-ti-k3.c rtc: Explicitly include correct DT includes 2023-07-27 23:31:29 +02:00
rtc-tps6586x.c rtc: tps6586x: Report maximum alarm limit to rtc core 2023-08-27 23:50:22 +02:00
rtc-tps65910.c rtc: tps65910: Remove redundant dev_warn() and do not check for 0 return after calling platform_get_irq() 2023-08-17 01:17:34 +02:00
rtc-twl.c rtc: twl: remove unnecessary messages 2023-09-06 01:26:04 +02:00
rtc-vt8500.c rtc: vt8500: Convert to platform remove callback returning void 2023-03-17 23:03:18 +01:00
rtc-wilco-ec.c
rtc-wm831x.c
rtc-wm8350.c rtc: wm8350: remove unnecessary messages 2023-09-06 01:26:04 +02:00
rtc-x1205.c rtc: Switch i2c drivers back to use .probe() 2023-06-06 23:29:37 +02:00
rtc-xgene.c rtc: xgene: Convert to platform remove callback returning void 2023-03-17 23:03:18 +01:00
rtc-zynqmp.c rtc: zynqmp: Convert to platform remove callback returning void 2023-03-17 23:03:19 +01:00
sysfs.c