Drivers running .shutdown() might want to behave differently during kexec.
Convert kexec_in_progress into a function and export it, so it can be used by drivers that are either built-in or modules.
Cc: stable@vger.kernel.org Fixes: 83bfc7e793b5 ("ASoC: SOF: core: unregister clients and machine drivers in .shutdown") Signed-off-by: Ricardo Ribalda ribalda@chromium.org --- arch/powerpc/platforms/pseries/vio.c | 2 +- arch/x86/kernel/cpu/mshyperv.c | 6 +++--- arch/x86/xen/enlighten_hvm.c | 2 +- drivers/firmware/efi/efi.c | 2 +- drivers/pci/pci-driver.c | 2 +- include/linux/kexec.h | 5 ++--- kernel/kexec_core.c | 12 ++++++++++-- 7 files changed, 19 insertions(+), 12 deletions(-)
diff --git a/arch/powerpc/platforms/pseries/vio.c b/arch/powerpc/platforms/pseries/vio.c index 00ecac2c205b..923f9a36b992 100644 --- a/arch/powerpc/platforms/pseries/vio.c +++ b/arch/powerpc/platforms/pseries/vio.c @@ -1289,7 +1289,7 @@ static void vio_bus_shutdown(struct device *dev) viodrv = to_vio_driver(dev->driver); if (viodrv->shutdown) viodrv->shutdown(viodev); - else if (kexec_in_progress) + else if (kexec_in_progress()) vio_bus_remove(dev); } } diff --git a/arch/x86/kernel/cpu/mshyperv.c b/arch/x86/kernel/cpu/mshyperv.c index 831613959a92..f91f35206489 100644 --- a/arch/x86/kernel/cpu/mshyperv.c +++ b/arch/x86/kernel/cpu/mshyperv.c @@ -122,21 +122,21 @@ void hv_remove_crash_handler(void) #ifdef CONFIG_KEXEC_CORE static void hv_machine_shutdown(void) { - if (kexec_in_progress && hv_kexec_handler) + if (kexec_in_progress() && hv_kexec_handler) hv_kexec_handler();
/* * Call hv_cpu_die() on all the CPUs, otherwise later the hypervisor * corrupts the old VP Assist Pages and can crash the kexec kernel. */ - if (kexec_in_progress && hyperv_init_cpuhp > 0) + if (kexec_in_progress() && hyperv_init_cpuhp > 0) cpuhp_remove_state(hyperv_init_cpuhp);
/* The function calls stop_other_cpus(). */ native_machine_shutdown();
/* Disable the hypercall page when there is only 1 active CPU. */ - if (kexec_in_progress) + if (kexec_in_progress()) hyperv_cleanup(); }
diff --git a/arch/x86/xen/enlighten_hvm.c b/arch/x86/xen/enlighten_hvm.c index c1cd28e915a3..769163833ffc 100644 --- a/arch/x86/xen/enlighten_hvm.c +++ b/arch/x86/xen/enlighten_hvm.c @@ -145,7 +145,7 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_xen_hvm_callback) static void xen_hvm_shutdown(void) { native_machine_shutdown(); - if (kexec_in_progress) + if (kexec_in_progress()) xen_reboot(SHUTDOWN_soft_reset); }
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index a46df5d1d094..608bc2146802 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -1040,7 +1040,7 @@ static int update_efi_random_seed(struct notifier_block *nb, struct linux_efi_random_seed *seed; u32 size = 0;
- if (!kexec_in_progress) + if (!kexec_in_progress()) return NOTIFY_DONE;
seed = memremap(efi_rng_seed, sizeof(*seed), MEMREMAP_WB); diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index 107d77f3c846..23eeb7538b03 100644 --- a/drivers/pci/pci-driver.c +++ b/drivers/pci/pci-driver.c @@ -519,7 +519,7 @@ static void pci_device_shutdown(struct device *dev) * If it is not a kexec reboot, firmware will hit the PCI * devices with big hammer and stop their DMA any way. */ - if (kexec_in_progress && (pci_dev->current_state <= PCI_D3hot)) + if (kexec_in_progress() && pci_dev->current_state <= PCI_D3hot) pci_clear_master(pci_dev); }
diff --git a/include/linux/kexec.h b/include/linux/kexec.h index 41a686996aaa..2ec0aec1a0de 100644 --- a/include/linux/kexec.h +++ b/include/linux/kexec.h @@ -423,8 +423,7 @@ extern int kexec_load_disabled; #define KEXEC_FILE_FLAGS (KEXEC_FILE_UNLOAD | KEXEC_FILE_ON_CRASH | \ KEXEC_FILE_NO_INITRAMFS)
-/* flag to track if kexec reboot is in progress */ -extern bool kexec_in_progress; +bool kexec_in_progress(void);
int crash_shrink_memory(unsigned long new_size); ssize_t crash_get_memory_size(void); @@ -507,7 +506,7 @@ static inline void __crash_kexec(struct pt_regs *regs) { } static inline void crash_kexec(struct pt_regs *regs) { } static inline int kexec_should_crash(struct task_struct *p) { return 0; } static inline int kexec_crash_loaded(void) { return 0; } -#define kexec_in_progress false +static inline bool kexec_in_progress(void) { return false; } #endif /* CONFIG_KEXEC_CORE */
#ifdef CONFIG_KEXEC_SIG diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c index ca2743f9c634..4495d0fc28ae 100644 --- a/kernel/kexec_core.c +++ b/kernel/kexec_core.c @@ -52,8 +52,16 @@ atomic_t __kexec_lock = ATOMIC_INIT(0); note_buf_t __percpu *crash_notes;
/* Flag to indicate we are going to kexec a new kernel */ -bool kexec_in_progress = false; +static bool kexec_in_progress_internal;
+/** + * kexec_in_progress - Check if the system is going to kexec + */ +bool kexec_in_progress(void) +{ + return kexec_in_progress_internal; +} +EXPORT_SYMBOL(kexec_in_progress);
/* Location of the reserved area for the crash kernel */ struct resource crashk_res = { @@ -1175,7 +1183,7 @@ int kernel_kexec(void) } else #endif { - kexec_in_progress = true; + kexec_in_progress_internal = true; kernel_restart_prepare("kexec reboot"); migrate_to_reboot_cpu();