https://github.com/torvalds/linux
Revision d9ff0eb9ca4b00ce2fbf9ede1e99681f05c0bc91 authored by Youngmin Nam on 08 February 2016, 15:49:28 UTC, committed by Linus Walleij on 15 February 2016, 19:45:50 UTC
Previously, samsung_gpio_drection_in/output function were not covered with a spinlock. For example, samsung_gpio_direction_output function consists of two functions. 1. samsung_gpio_set 2. samsung_gpio_set_direction When 2 CPUs try to control the same gpio pin heavily, (situation like i2c control with gpio emulation) This situation can cause below problem. CPU 0 | CPU1 | samsung_gpio_direction_output | samsung_gpio_set(pin A as 1) | samsung_gpio_direction_output | samsung_gpio_set(pin A as 0) samsung_gpio_set_direction | | samsung_gpio_set_direction The initial value of pin A will be set as 0 while we wanted to set pin A as 1. This patch modifies samsung_gpio_direction_in/output function to be done in one spinlock to fix race condition. Additionally, the new samsung_gpio_set_value was added to implement gpio set callback(samsung_gpio_set) with spinlock using this function. Cc: stable@vger.kernel.org Signed-off-by: Youngmin Nam <ym0914@gmail.com> Acked-by: Tomasz Figa <tomasz.figa@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
1 parent 7864d92
Tip revision: d9ff0eb9ca4b00ce2fbf9ede1e99681f05c0bc91 authored by Youngmin Nam on 08 February 2016, 15:49:28 UTC
pinctrl: samsung: fix SMP race condition
pinctrl: samsung: fix SMP race condition
Tip revision: d9ff0eb
File | Mode | Size |
---|---|---|
bpf | ||
configs | ||
debug | ||
events | ||
gcov | ||
irq | ||
livepatch | ||
locking | ||
power | ||
printk | ||
rcu | ||
sched | ||
time | ||
trace | ||
.gitignore | -rw-r--r-- | 69 bytes |
Kconfig.freezer | -rw-r--r-- | 52 bytes |
Kconfig.hz | -rw-r--r-- | 1.6 KB |
Kconfig.locks | -rw-r--r-- | 4.8 KB |
Kconfig.preempt | -rw-r--r-- | 2.1 KB |
Makefile | -rw-r--r-- | 3.8 KB |
acct.c | -rw-r--r-- | 15.4 KB |
async.c | -rw-r--r-- | 9.9 KB |
audit.c | -rw-r--r-- | 53.1 KB |
audit.h | -rw-r--r-- | 10.9 KB |
audit_fsnotify.c | -rw-r--r-- | 6.1 KB |
audit_tree.c | -rw-r--r-- | 22.7 KB |
audit_watch.c | -rw-r--r-- | 14.4 KB |
auditfilter.c | -rw-r--r-- | 34.7 KB |
auditsc.c | -rw-r--r-- | 64.0 KB |
backtracetest.c | -rw-r--r-- | 2.1 KB |
bounds.c | -rw-r--r-- | 703 bytes |
capability.c | -rw-r--r-- | 12.1 KB |
cgroup.c | -rw-r--r-- | 162.0 KB |
cgroup_freezer.c | -rw-r--r-- | 12.4 KB |
cgroup_pids.c | -rw-r--r-- | 8.0 KB |
compat.c | -rw-r--r-- | 29.5 KB |
configs.c | -rw-r--r-- | 2.8 KB |
context_tracking.c | -rw-r--r-- | 6.3 KB |
cpu.c | -rw-r--r-- | 18.9 KB |
cpu_pm.c | -rw-r--r-- | 6.5 KB |
cpuset.c | -rw-r--r-- | 75.4 KB |
crash_dump.c | -rw-r--r-- | 1.3 KB |
cred.c | -rw-r--r-- | 21.4 KB |
delayacct.c | -rw-r--r-- | 4.5 KB |
dma.c | -rw-r--r-- | 3.6 KB |
elfcore.c | -rw-r--r-- | 396 bytes |
exec_domain.c | -rw-r--r-- | 1.4 KB |
exit.c | -rw-r--r-- | 41.5 KB |
extable.c | -rw-r--r-- | 4.0 KB |
fork.c | -rw-r--r-- | 50.7 KB |
freezer.c | -rw-r--r-- | 4.4 KB |
futex.c | -rw-r--r-- | 85.0 KB |
futex_compat.c | -rw-r--r-- | 4.5 KB |
groups.c | -rw-r--r-- | 5.9 KB |
hung_task.c | -rw-r--r-- | 5.7 KB |
irq_work.c | -rw-r--r-- | 4.4 KB |
jump_label.c | -rw-r--r-- | 12.5 KB |
kallsyms.c | -rw-r--r-- | 14.9 KB |
kcmp.c | -rw-r--r-- | 4.4 KB |
kexec.c | -rw-r--r-- | 6.6 KB |
kexec_core.c | -rw-r--r-- | 38.7 KB |
kexec_file.c | -rw-r--r-- | 25.0 KB |
kexec_internal.h | -rw-r--r-- | 1.2 KB |
kmod.c | -rw-r--r-- | 19.1 KB |
kprobes.c | -rw-r--r-- | 60.7 KB |
ksysfs.c | -rw-r--r-- | 6.2 KB |
kthread.c | -rw-r--r-- | 19.2 KB |
latencytop.c | -rw-r--r-- | 7.6 KB |
membarrier.c | -rw-r--r-- | 2.4 KB |
memremap.c | -rw-r--r-- | 10.9 KB |
module-internal.h | -rw-r--r-- | 458 bytes |
module.c | -rw-r--r-- | 102.9 KB |
module_signing.c | -rw-r--r-- | 2.0 KB |
notifier.c | -rw-r--r-- | 16.3 KB |
nsproxy.c | -rw-r--r-- | 6.0 KB |
padata.c | -rw-r--r-- | 26.8 KB |
panic.c | -rw-r--r-- | 13.8 KB |
params.c | -rw-r--r-- | 24.1 KB |
pid.c | -rw-r--r-- | 15.0 KB |
pid_namespace.c | -rw-r--r-- | 10.0 KB |
profile.c | -rw-r--r-- | 16.1 KB |
ptrace.c | -rw-r--r-- | 31.6 KB |
range.c | -rw-r--r-- | 3.0 KB |
reboot.c | -rw-r--r-- | 13.3 KB |
relay.c | -rw-r--r-- | 32.5 KB |
resource.c | -rw-r--r-- | 37.2 KB |
seccomp.c | -rw-r--r-- | 24.7 KB |
signal.c | -rw-r--r-- | 93.9 KB |
smp.c | -rw-r--r-- | 19.9 KB |
smpboot.c | -rw-r--r-- | 13.1 KB |
smpboot.h | -rw-r--r-- | 564 bytes |
softirq.c | -rw-r--r-- | 18.9 KB |
stacktrace.c | -rw-r--r-- | 1.7 KB |
stop_machine.c | -rw-r--r-- | 16.4 KB |
sys.c | -rw-r--r-- | 57.5 KB |
sys_ni.c | -rw-r--r-- | 7.0 KB |
sysctl.c | -rw-r--r-- | 64.8 KB |
sysctl_binary.c | -rw-r--r-- | 51.0 KB |
task_work.c | -rw-r--r-- | 3.2 KB |
taskstats.c | -rw-r--r-- | 16.1 KB |
test_kprobes.c | -rw-r--r-- | 7.4 KB |
torture.c | -rw-r--r-- | 19.9 KB |
tracepoint.c | -rw-r--r-- | 14.5 KB |
tsacct.c | -rw-r--r-- | 4.9 KB |
uid16.c | -rw-r--r-- | 5.0 KB |
up.c | -rw-r--r-- | 1.7 KB |
user-return-notifier.c | -rw-r--r-- | 1.3 KB |
user.c | -rw-r--r-- | 5.4 KB |
user_namespace.c | -rw-r--r-- | 25.4 KB |
utsname.c | -rw-r--r-- | 3.0 KB |
utsname_sysctl.c | -rw-r--r-- | 3.0 KB |
watchdog.c | -rw-r--r-- | 29.5 KB |
workqueue.c | -rw-r--r-- | 150.5 KB |
workqueue_internal.h | -rw-r--r-- | 2.2 KB |
Computing file changes ...