From 775b64d2b6ca37697de925f70799c710aab5849a Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Sat, 12 Jan 2008 20:40:46 +0100 Subject: PM: Acquire device locks on suspend This patch reorganizes the way suspend and resume notifications are sent to drivers. The major changes are that now the PM core acquires every device semaphore before calling the methods, and calls to device_add() during suspends will fail, while calls to device_del() during suspends will block. It also provides a way to safely remove a suspended device with the help of the PM core, by using the device_pm_schedule_removal() callback introduced specifically for this purpose, and updates two drivers (msr and cpuid) that need to use it. Signed-off-by: Alan Stern Signed-off-by: Rafael J. Wysocki Signed-off-by: Greg Kroah-Hartman --- arch/x86/kernel/cpuid.c | 6 +++--- arch/x86/kernel/msr.c | 6 +++--- 2 files changed, 6 insertions(+), 6 deletions(-) (limited to 'arch/x86/kernel') diff --git a/arch/x86/kernel/cpuid.c b/arch/x86/kernel/cpuid.c index 05c9936a16c..d387c770c51 100644 --- a/arch/x86/kernel/cpuid.c +++ b/arch/x86/kernel/cpuid.c @@ -157,15 +157,15 @@ static int __cpuinit cpuid_class_cpu_callback(struct notifier_block *nfb, switch (action) { case CPU_UP_PREPARE: - case CPU_UP_PREPARE_FROZEN: err = cpuid_device_create(cpu); break; case CPU_UP_CANCELED: - case CPU_UP_CANCELED_FROZEN: case CPU_DEAD: - case CPU_DEAD_FROZEN: cpuid_device_destroy(cpu); break; + case CPU_UP_CANCELED_FROZEN: + destroy_suspended_device(cpuid_class, MKDEV(CPUID_MAJOR, cpu)); + break; } return err ? NOTIFY_BAD : NOTIFY_OK; } diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c index ee6eba4ecfe..21f6e3c0be1 100644 --- a/arch/x86/kernel/msr.c +++ b/arch/x86/kernel/msr.c @@ -155,15 +155,15 @@ static int __cpuinit msr_class_cpu_callback(struct notifier_block *nfb, switch (action) { case CPU_UP_PREPARE: - case CPU_UP_PREPARE_FROZEN: err = msr_device_create(cpu); break; case CPU_UP_CANCELED: - case CPU_UP_CANCELED_FROZEN: case CPU_DEAD: - case CPU_DEAD_FROZEN: msr_device_destroy(cpu); break; + case CPU_UP_CANCELED_FROZEN: + destroy_suspended_device(msr_class, MKDEV(MSR_MAJOR, cpu)); + break; } return err ? NOTIFY_BAD : NOTIFY_OK; } -- cgit v1.2.3