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linux-sg2042/arch/mips
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Matt Redfearn 8f46cca1e6 MIPS: SMP: Fix possibility of deadlock when bringing CPUs online 
This patch fixes the possibility of a deadlock when bringing up
secondary CPUs.
The deadlock occurs because the set_cpu_online() is called before
synchronise_count_slave(). This can cause a deadlock if the boot CPU,
having scheduled another thread, attempts to send an IPI to the
secondary CPU, which it sees has been marked online. The secondary is
blocked in synchronise_count_slave() waiting for the boot CPU to enter
synchronise_count_master(), but the boot cpu is blocked in
smp_call_function_many() waiting for the secondary to respond to it's
IPI request.

Fix this by marking the CPU online in cpu_callin_map and synchronising
counters before declaring the CPU online and calculating the maps for
IPIs.

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Reported-by: Justin Chen <justinpopo6@gmail.com>
Tested-by: Justin Chen <justinpopo6@gmail.com>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: stable@vger.kernel.org # v4.1+
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14302/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
 		2016-09-25 01:43:52 +02:00
..
alchemy Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2016-05-19 10:02:26 -07:00
ar7 MIPS: ar7: use gpiochip data pointer 2016-02-19 09:51:43 +01:00
ath25 genirq: Remove irq argument from irq flow handlers 2015-09-16 15:47:51 +02:00
ath79 MIPS: ath79: Fix test for error return of clk_register_fixed_factor(). 2016-09-13 14:13:26 +02:00
bcm47xx MIPS: BCM47xx: Move SPROM driver to drivers/firmware/ 2016-05-13 14:01:43 +02:00
bcm63xx Merge branch 'ib-mfd-regulator-gpio-4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd into devel 2016-03-09 17:40:37 +07:00
bmips MIPS: store the appended dtb address in a variable 2016-08-02 14:00:16 +02:00
boot MIPS: tools: Fix relocs tool compiler warnings 2016-08-03 09:00:55 +02:00
cavium-octeon MIPS: Octeon: Fix platform bus probing 2016-09-19 17:35:44 +02:00
cobalt MIPS: Cobalt: Fix typo 2016-08-03 08:16:30 +02:00
configs Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2016-08-06 09:13:11 -04:00
dec MIPS: DEC: Export `ioasic_ssr_lock' to modules 2016-05-17 11:03:54 +02:00
emma
…
fw MIPS: Fix misspellings in comments. 2016-04-03 12:32:09 +02:00
include MIPS: Octeon: mangle-port: fix build failure with VDSO code 2016-09-19 17:21:37 +02:00
jazz MIPS: Jazz: Migrate to new 'set-state' interface 2015-09-03 12:07:50 +02:00
jz4740 tree-wide: replace config_enabled() with IS_ENABLED() 2016-08-04 08:50:07 -04:00
kernel MIPS: SMP: Fix possibility of deadlock when bringing CPUs online 2016-09-25 01:43:52 +02:00
kvm MIPS: KVM: Check for pfn noslot case 2016-08-19 17:22:26 +02:00
lantiq Merge branch '4.7-fixes' into mips-for-linux-next 2016-08-03 12:55:49 +02:00
lasat MIPS: Lasat: A couple off by one bugs in picvue_proc.c 2016-05-28 12:35:06 +02:00
lib MIPS: lib: Mark intrinsics notrace 2016-05-28 12:35:11 +02:00
loongson32 MIPS: Loongson1B: Some updates/fixes for LS1B 2016-05-13 14:02:05 +02:00
loongson64 Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2016-08-06 09:13:11 -04:00
math-emu Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2016-08-06 09:13:11 -04:00
mm MIPS: c-r4k: Fix size calc when avoiding IPIs for small icache flushes 2016-09-13 17:37:20 +02:00
mti-malta tree-wide: replace config_enabled() with IS_ENABLED() 2016-08-04 08:50:07 -04:00
mti-sead3 mips: Remove unnecessary of_platform_populate with default match table 2016-06-23 15:00:29 -05:00
net Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2016-08-06 09:13:11 -04:00
netlogic dma-mapping: use unsigned long for dma_attrs 2016-08-04 08:50:07 -04:00
oprofile MIPS/Loongson-3: Convert oprofile to hotplug state machine 2016-07-15 10:40:29 +02:00
paravirt MIPS: SMP: Don't increment irq_count multiple times for call function IPIs 2015-08-03 09:25:12 +02:00
pci MIPS/PCI: Claim bus resources on PCI_PROBE_ONLY set-ups 2016-06-23 16:32:20 -05:00
pic32 Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2016-08-06 09:13:11 -04:00
pistachio Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2016-08-06 09:13:11 -04:00
pmcs-msp71xx MIPS: MSP71xx: Use __flush_cache_all instead of flush_cache_all. 2016-05-13 14:01:38 +02:00
pnx833x MIPS: make PCI_DMA_BUS_IS_PHYS=1 constant 2016-05-13 14:02:17 +02:00
power MIPS: Hibernate: flush TLB entries earlier 2015-04-10 15:41:52 +02:00
ralink Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus 2016-08-06 09:13:11 -04:00
rb532 MIPS: rb532: use gpiochip data pointer 2016-02-19 09:51:44 +01:00
sgi-ip22 rtc: ds1286: move header to linux/rtc 2016-07-08 16:23:11 +02:00
sgi-ip27 MIPS: Spelling fix lets -> let's 2016-05-28 12:35:09 +02:00
sgi-ip32 MIPS: IP32: Fix build errors in reset code in DS1685 platform hook. 2015-05-13 00:01:41 +02:00
sibyte MIPS: Sibyte: Fix Kconfig dependencies of SIBYTE_BUS_WATCHER 2016-05-09 12:00:03 +02:00
sni char/genrtc: remove asm-generic/rtc.h from mips 2016-06-04 00:23:36 +02:00
txx9 treewide: replace obsolete _refok by __ref 2016-08-02 17:31:41 -04:00
vdso MIPS: Build microMIPS VDSO for microMIPS kernels 2016-05-28 12:35:12 +02:00
vr41xx MIPS: VR41xx: Fix typo 2016-05-28 12:35:09 +02:00
xilfpga mips: Remove unnecessary of_platform_populate with default match table 2016-06-23 15:00:29 -05:00
Kbuild MIPS: Initial implementation of a VDSO 2015-11-11 08:36:36 +01:00
Kbuild.platforms MIPS: Add support for PIC32MZDA platform 2016-01-24 02:53:28 +01:00
Kconfig MIPS: Select HAVE_REGS_AND_STACK_ACCESS_API 2016-09-19 18:37:43 +02:00
Kconfig.debug MIPS: Remove compact branch policy Kconfig entries 2016-09-13 14:14:50 +02:00
Makefile MIPS: Remove compact branch policy Kconfig entries 2016-09-13 14:14:50 +02:00