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7b0e827c69
linux/arch/powerpc/platforms
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Nicholas Piggin 682e6b4da5 rtc: opal: Fix OPAL RTC driver OPAL_BUSY loops 
The OPAL RTC driver does not sleep in case it gets OPAL_BUSY or
OPAL_BUSY_EVENT from firmware, which causes large scheduling
latencies, up to 50 seconds have been observed here when RTC stops
responding (BMC reboot can do it).

Fix this by converting it to the standard form OPAL_BUSY loop that
sleeps.

Fixes: 628daa8d5a ("powerpc/powernv: Add RTC and NVRAM support plus RTAS fallbacks")
Cc: stable@vger.kernel.org # v3.2+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2018-04-25 13:24:13 +10:00
..
4xx powerpc/4xx: Fix error return code in ppc4xx_msi_probe() 2018-03-31 00:10:34 +11:00
8xx powerpc/8xx: fix cpm_cascade() dual end of interrupt 2018-03-13 15:50:28 +11:00
40x License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
44x powerpc/44x/fsp2: Add irq error handlers 2017-12-11 13:03:34 +11:00
52xx powerpc/mpc52xx_gpt: make use of raw_spinlock variants 2018-01-27 21:12:04 +11:00
82xx License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
83xx powerpc: Use octal numbers for file permissions 2018-01-22 05:48:33 +11:00
85xx powerpc/64: Use array of paca pointers and allocate pacas individually 2018-03-30 23:34:23 +11:00
86xx powerpc: Use pr_warn instead of pr_warning 2017-12-04 11:54:34 +11:00
512x powerpc: Use pr_warn instead of pr_warning 2017-12-04 11:54:34 +11:00
amigaone License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
cell proc: fix /proc/loadavg regression 2018-04-20 17:18:36 -07:00
chrp License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
embedded6xx powerpc/wii: Don't rely on the reserved memory hack 2018-04-01 00:47:43 +11:00
maple powerpc: Set I/O port resource types correctly 2017-12-18 23:07:45 -06:00
pasemi powerpc updates for 4.16 2018-02-02 10:01:04 -08:00
powermac powerpc: Use sizeof(*foo) rather than sizeof(struct foo) 2018-03-20 16:47:53 +11:00
powernv rtc: opal: Fix OPAL RTC driver OPAL_BUSY loops 2018-04-25 13:24:13 +10:00
ps3 powerpc: Use sizeof(*foo) rather than sizeof(struct foo) 2018-03-20 16:47:53 +11:00
pseries powerpc/pseries: Restore default security feature flags on setup 2018-04-03 21:50:09 +10:00
fsl_uli1575.c of/irq: Refactor interrupt-map parsing 2013-10-24 11:43:04 +01:00
Kconfig powerpc/cell: Remove axonram driver 2018-01-28 17:00:36 +11:00
Kconfig.cputype powerpc/64s: Add POWER9 CPU type selection 2018-04-01 22:15:32 +10:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00