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authorSteven Rostedt <rostedt@goodmis.org>2013-02-13 14:26:05 (GMT)
committerScott Wood <scottwood@freescale.com>2014-04-10 00:19:58 (GMT)
commita8a70bda781207074ba4f7d9d1866e9d61943cba (patch)
treeba78ff995b420a9a346dca1d9f7e2815995fdd44 /include/acpi
parent51c37666addbc8e49703d45c7f078a29d3832e00 (diff)
downloadlinux-fsl-qoriq-a8a70bda781207074ba4f7d9d1866e9d61943cba.tar.xz
acpi/rt: Convert acpi_gbl_hardware lock back to a raw_spinlock_t
We hit the following bug with 3.6-rt: [ 5.898990] BUG: scheduling while atomic: swapper/3/0/0x00000002 [ 5.898991] no locks held by swapper/3/0. [ 5.898993] Modules linked in: [ 5.898996] Pid: 0, comm: swapper/3 Not tainted 3.6.11-rt28.19.el6rt.x86_64.debug #1 [ 5.898997] Call Trace: [ 5.899011] [<ffffffff810804e7>] __schedule_bug+0x67/0x90 [ 5.899028] [<ffffffff81577923>] __schedule+0x793/0x7a0 [ 5.899032] [<ffffffff810b4e40>] ? debug_rt_mutex_print_deadlock+0x50/0x200 [ 5.899034] [<ffffffff81577b89>] schedule+0x29/0x70 [ 5.899036] BUG: scheduling while atomic: swapper/7/0/0x00000002 [ 5.899037] no locks held by swapper/7/0. [ 5.899039] [<ffffffff81578525>] rt_spin_lock_slowlock+0xe5/0x2f0 [ 5.899040] Modules linked in: [ 5.899041] [ 5.899045] [<ffffffff81579a58>] ? _raw_spin_unlock_irqrestore+0x38/0x90 [ 5.899046] Pid: 0, comm: swapper/7 Not tainted 3.6.11-rt28.19.el6rt.x86_64.debug #1 [ 5.899047] Call Trace: [ 5.899049] [<ffffffff81578bc6>] rt_spin_lock+0x16/0x40 [ 5.899052] [<ffffffff810804e7>] __schedule_bug+0x67/0x90 [ 5.899054] [<ffffffff8157d3f0>] ? notifier_call_chain+0x80/0x80 [ 5.899056] [<ffffffff81577923>] __schedule+0x793/0x7a0 [ 5.899059] [<ffffffff812f2034>] acpi_os_acquire_lock+0x1f/0x23 [ 5.899062] [<ffffffff810b4e40>] ? debug_rt_mutex_print_deadlock+0x50/0x200 [ 5.899068] [<ffffffff8130be64>] acpi_write_bit_register+0x33/0xb0 [ 5.899071] [<ffffffff81577b89>] schedule+0x29/0x70 [ 5.899072] [<ffffffff8130be13>] ? acpi_read_bit_register+0x33/0x51 [ 5.899074] [<ffffffff81578525>] rt_spin_lock_slowlock+0xe5/0x2f0 [ 5.899077] [<ffffffff8131d1fc>] acpi_idle_enter_bm+0x8a/0x28e [ 5.899079] [<ffffffff81579a58>] ? _raw_spin_unlock_irqrestore+0x38/0x90 [ 5.899081] [<ffffffff8107e5da>] ? this_cpu_load+0x1a/0x30 [ 5.899083] [<ffffffff81578bc6>] rt_spin_lock+0x16/0x40 [ 5.899087] [<ffffffff8144c759>] cpuidle_enter+0x19/0x20 [ 5.899088] [<ffffffff8157d3f0>] ? notifier_call_chain+0x80/0x80 [ 5.899090] [<ffffffff8144c777>] cpuidle_enter_state+0x17/0x50 [ 5.899092] [<ffffffff812f2034>] acpi_os_acquire_lock+0x1f/0x23 [ 5.899094] [<ffffffff8144d1a1>] cpuidle899101] [<ffffffff8130be13>] ? As the acpi code disables interrupts in acpi_idle_enter_bm, and calls code that grabs the acpi lock, it causes issues as the lock is currently in RT a sleeping lock. The lock was converted from a raw to a sleeping lock due to some previous issues, and tests that showed it didn't seem to matter. Unfortunately, it did matter for one of our boxes. This patch converts the lock back to a raw lock. I've run this code on a few of my own machines, one being my laptop that uses the acpi quite extensively. I've been able to suspend and resume without issues. [ tglx: Made the change exclusive for acpi_gbl_hardware_lock ] Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Cc: John Kacur <jkacur@gmail.com> Cc: Clark Williams <clark@redhat.com> Link: http://lkml.kernel.org/r/1360765565.23152.5.camel@gandalf.local.home Cc: stable-rt@vger.kernel.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Diffstat (limited to 'include/acpi')
-rw-r--r--include/acpi/platform/aclinux.h14
1 files changed, 14 insertions, 0 deletions
diff --git a/include/acpi/platform/aclinux.h b/include/acpi/platform/aclinux.h
index 68534ef..0ef299d 100644
--- a/include/acpi/platform/aclinux.h
+++ b/include/acpi/platform/aclinux.h
@@ -72,6 +72,7 @@
#define acpi_cache_t struct kmem_cache
#define acpi_spinlock spinlock_t *
+#define acpi_raw_spinlock raw_spinlock_t *
#define acpi_cpu_flags unsigned long
#else /* !__KERNEL__ */
@@ -174,6 +175,19 @@ static inline void *acpi_os_acquire_object(acpi_cache_t * cache)
lock ? AE_OK : AE_NO_MEMORY; \
})
+#define acpi_os_create_raw_lock(__handle) \
+({ \
+ raw_spinlock_t *lock = ACPI_ALLOCATE(sizeof(*lock)); \
+ \
+ if (lock) { \
+ *(__handle) = lock; \
+ raw_spin_lock_init(*(__handle)); \
+ } \
+ lock ? AE_OK : AE_NO_MEMORY; \
+})
+
+#define acpi_os_delete_raw_lock(__handle) kfree(__handle)
+
#endif /* __KERNEL__ */
#endif /* __ACLINUX_H__ */