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Revert "firmware: arm_sdei: Fix sleep from invalid context BUG"

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This reverts commit a8267bc8de.

It breaks the Android KABI and will be brought back at a later time when
it is safe to do so.

Bug: 161946584
Change-Id: Ieda338ddca472a71c81f980c75c1e01b35d2b345
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Greg Kroah-Hartman 2023-06-13 18:07:36 +00:00
parent 26c1cc6858
commit e2b436192b
2 changed files with 18 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

37
drivers/firmware/arm_sdei.c
View file

@ -43,8 +43,6 @@ static asmlinkage void (*sdei_firmware_call)(unsigned long function_id,
/* entry point from firmware to arch asm code */
static unsigned long sdei_entry_point;
static int sdei_hp_state;
struct sdei_event {
/* These three are protected by the sdei_list_lock */
struct list_head list;
@ -303,6 +301,8 @@ int sdei_mask_local_cpu(void)
{
int err;
WARN_ON_ONCE(preemptible());
err = invoke_sdei_fn(SDEI_1_0_FN_SDEI_PE_MASK, 0, 0, 0, 0, 0, NULL);
if (err && err != -EIO) {
pr_warn_once("failed to mask CPU[%u]: %d\n",
@ -315,7 +315,6 @@ int sdei_mask_local_cpu(void)
static void _ipi_mask_cpu(void *ignored)
{
WARN_ON_ONCE(preemptible());
sdei_mask_local_cpu();
}
@ -323,6 +322,8 @@ int sdei_unmask_local_cpu(void)
{
int err;
WARN_ON_ONCE(preemptible());
err = invoke_sdei_fn(SDEI_1_0_FN_SDEI_PE_UNMASK, 0, 0, 0, 0, 0, NULL);
if (err && err != -EIO) {
pr_warn_once("failed to unmask CPU[%u]: %d\n",
@ -335,7 +336,6 @@ int sdei_unmask_local_cpu(void)
static void _ipi_unmask_cpu(void *ignored)
{
WARN_ON_ONCE(preemptible());
sdei_unmask_local_cpu();
}
@ -343,8 +343,6 @@ static void _ipi_private_reset(void *ignored)
{
int err;
WARN_ON_ONCE(preemptible());
err = invoke_sdei_fn(SDEI_1_0_FN_SDEI_PRIVATE_RESET, 0, 0, 0, 0, 0,
NULL);
if (err && err != -EIO)
@ -391,6 +389,8 @@ static void _local_event_enable(void *data)
int err;
struct sdei_crosscall_args *arg = data;
WARN_ON_ONCE(preemptible());
err = sdei_api_event_enable(arg->event->event_num);
sdei_cross_call_return(arg, err);
@ -479,6 +479,8 @@ static void _local_event_unregister(void *data)
int err;
struct sdei_crosscall_args *arg = data;
WARN_ON_ONCE(preemptible());
err = sdei_api_event_unregister(arg->event->event_num);
sdei_cross_call_return(arg, err);
@ -559,6 +561,8 @@ static void _local_event_register(void *data)
struct sdei_registered_event *reg;
struct sdei_crosscall_args *arg = data;
WARN_ON(preemptible());
reg = per_cpu_ptr(arg->event->private_registered, smp_processor_id());
err = sdei_api_event_register(arg->event->event_num, sdei_entry_point,
reg, 0, 0);
@ -713,8 +717,6 @@ static int sdei_pm_notifier(struct notifier_block *nb, unsigned long action,
{
int rv;
WARN_ON_ONCE(preemptible());
switch (action) {
case CPU_PM_ENTER:
rv = sdei_mask_local_cpu();
@ -763,7 +765,7 @@ static int sdei_device_freeze(struct device *dev)
int err;
/* unregister private events */
cpuhp_remove_state(sdei_entry_point);
cpuhp_remove_state(CPUHP_AP_ARM_SDEI_STARTING);
err = sdei_unregister_shared();
if (err)
@ -784,15 +786,12 @@ static int sdei_device_thaw(struct device *dev)
return err;
}
err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "SDEI",
err = cpuhp_setup_state(CPUHP_AP_ARM_SDEI_STARTING, "SDEI",
&sdei_cpuhp_up, &sdei_cpuhp_down);
if (err < 0) {
if (err)
pr_warn("Failed to re-register CPU hotplug notifier...\n");
return err;
}
sdei_hp_state = err;
return 0;
return err;
}
static int sdei_device_restore(struct device *dev)
@ -824,7 +823,7 @@ static int sdei_reboot_notifier(struct notifier_block *nb, unsigned long action,
* We are going to reset the interface, after this there is no point
* doing work when we take CPUs offline.
*/
cpuhp_remove_state(sdei_hp_state);
cpuhp_remove_state(CPUHP_AP_ARM_SDEI_STARTING);
sdei_platform_reset();
@ -1004,15 +1003,13 @@ static int sdei_probe(struct platform_device *pdev)
goto remove_cpupm;
}
err = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "SDEI",
err = cpuhp_setup_state(CPUHP_AP_ARM_SDEI_STARTING, "SDEI",
&sdei_cpuhp_up, &sdei_cpuhp_down);
if (err < 0) {
if (err) {
pr_warn("Failed to register CPU hotplug notifier...\n");
goto remove_reboot;
}
sdei_hp_state = err;
return 0;
remove_reboot:

1
include/linux/cpuhotplug.h
View file

@ -161,6 +161,7 @@ enum cpuhp_state {
CPUHP_AP_PERF_X86_CSTATE_STARTING,
CPUHP_AP_PERF_XTENSA_STARTING,
CPUHP_AP_MIPS_OP_LOONGSON3_STARTING,
CPUHP_AP_ARM_SDEI_STARTING,
CPUHP_AP_ARM_VFP_STARTING,
CPUHP_AP_ARM64_DEBUG_MONITORS_STARTING,
CPUHP_AP_PERF_ARM_HW_BREAKPOINT_STARTING,