efivars: Disable external interrupt while holding efivars->lock

commit 81fa4e581d9283f7992a0d8c534bb141eb840a14 upstream.

[Problem]
There is a scenario which efi_pstore fails to log messages in a panic case.

 - CPUA holds an efi_var->lock in either efivarfs parts
   or efi_pstore with interrupt enabled.
 - CPUB panics and sends IPI to CPUA in smp_send_stop().
 - CPUA stops with holding the lock.
 - CPUB kicks efi_pstore_write() via kmsg_dump(KSMG_DUMP_PANIC)
   but it returns without logging messages.

[Patch Description]
This patch disables an external interruption while holding efivars->lock
as follows.

In efi_pstore_write() and get_var_data(), spin_lock/spin_unlock is
replaced by spin_lock_irqsave/spin_unlock_irqrestore because they may
be called in an interrupt context.

In other functions, they are replaced by spin_lock_irq/spin_unlock_irq.
because they are all called from a process context.

By applying this patch, we can avoid the problem above with
a following senario.

 - CPUA holds an efi_var->lock with interrupt disabled.
 - CPUB panics and sends IPI to CPUA in smp_send_stop().
 - CPUA receives the IPI after releasing the lock because it is
   disabling interrupt while holding the lock.
 - CPUB waits for one sec until CPUA releases the lock.
 - CPUB kicks efi_pstore_write() via kmsg_dump(KSMG_DUMP_PANIC)
   And it can hold the lock successfully.

Signed-off-by: Seiji Aguchi <seiji.aguchi@hds.com>
Acked-by: Mike Waychison <mikew@google.com>
Acked-by: Matt Fleming <matt.fleming@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
[bwh: Backported to 3.2:
 - Drop efivarfs changes
 - Adjust context
 - Drop change to efi_pstore_erase(), which is implemented using
   efi_pstore_write() here]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c
index 0fd62b9..06d3d3c 100644 (file)
--- a/drivers/firmware/efivars.c
+++ b/drivers/firmware/efivars.c
@@ -393,10 +393,11 @@ static efi_status_t
 get_var_data(struct efivars *efivars, struct efi_variable *var)
 {
        efi_status_t status;
+       unsigned long flags;
 
-       spin_lock(&efivars->lock);
+       spin_lock_irqsave(&efivars->lock, flags);
        status = get_var_data_locked(efivars, var);
-       spin_unlock(&efivars->lock);
+       spin_unlock_irqrestore(&efivars->lock, flags);
 
        if (status != EFI_SUCCESS) {
                printk(KERN_WARNING "efivars: get_variable() failed 0x%lx!\n",
@@ -525,14 +526,14 @@ efivar_store_raw(struct efivar_entry *entry, const char *buf, size_t count)
                return -EINVAL;
        }
 
-       spin_lock(&efivars->lock);
+       spin_lock_irq(&efivars->lock);
        status = efivars->ops->set_variable(new_var->VariableName,
                                            &new_var->VendorGuid,
                                            new_var->Attributes,
                                            new_var->DataSize,
                                            new_var->Data);
 
-       spin_unlock(&efivars->lock);
+       spin_unlock_irq(&efivars->lock);
 
        if (status != EFI_SUCCESS) {
                printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n",
@@ -643,7 +644,7 @@ static int efi_pstore_open(struct pstore_info *psi)
 {
        struct efivars *efivars = psi->data;
 
-       spin_lock(&efivars->lock);
+       spin_lock_irq(&efivars->lock);
        efivars->walk_entry = list_first_entry(&efivars->list,
                                               struct efivar_entry, list);
        return 0;
@@ -653,7 +654,7 @@ static int efi_pstore_close(struct pstore_info *psi)
 {
        struct efivars *efivars = psi->data;
 
-       spin_unlock(&efivars->lock);
+       spin_unlock_irq(&efivars->lock);
        return 0;
 }
 
@@ -708,11 +709,12 @@ static int efi_pstore_write(enum pstore_type_id type, u64 *id,
        int i, ret = 0;
        u64 storage_space, remaining_space, max_variable_size;
        efi_status_t status = EFI_NOT_FOUND;
+       unsigned long flags;
 
        sprintf(stub_name, "dump-type%u-%u-", type, part);
        sprintf(name, "%s%lu", stub_name, get_seconds());
 
-       spin_lock(&efivars->lock);
+       spin_lock_irqsave(&efivars->lock, flags);
 
        /*
         * Check if there is a space enough to log.
@@ -724,7 +726,7 @@ static int efi_pstore_write(enum pstore_type_id type, u64 *id,
                                                   &remaining_space,
                                                   &max_variable_size);
        if (status || remaining_space < size + DUMP_NAME_LEN * 2) {
-               spin_unlock(&efivars->lock);
+               spin_unlock_irqrestore(&efivars->lock, flags);
                *id = part;
                return -ENOSPC;
        }
@@ -765,7 +767,7 @@ static int efi_pstore_write(enum pstore_type_id type, u64 *id,
        efivars->ops->set_variable(efi_name, &vendor, PSTORE_EFI_ATTRIBUTES,
                                   size, psi->buf);
 
-       spin_unlock(&efivars->lock);
+       spin_unlock_irqrestore(&efivars->lock, flags);
 
        if (found)
                efivar_unregister(found);
@@ -848,7 +850,7 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
                return -EINVAL;
        }
 
-       spin_lock(&efivars->lock);
+       spin_lock_irq(&efivars->lock);
 
        /*
         * Does this variable already exist?
@@ -866,7 +868,7 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
                }
        }
        if (found) {
-               spin_unlock(&efivars->lock);
+               spin_unlock_irq(&efivars->lock);
                return -EINVAL;
        }
 
@@ -880,10 +882,10 @@ static ssize_t efivar_create(struct file *filp, struct kobject *kobj,
        if (status != EFI_SUCCESS) {
                printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n",
                        status);
-               spin_unlock(&efivars->lock);
+               spin_unlock_irq(&efivars->lock);
                return -EIO;
        }
-       spin_unlock(&efivars->lock);
+       spin_unlock_irq(&efivars->lock);
 
        /* Create the entry in sysfs.  Locking is not required here */
        status = efivar_create_sysfs_entry(efivars,
@@ -911,7 +913,7 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
        if (!capable(CAP_SYS_ADMIN))
                return -EACCES;
 
-       spin_lock(&efivars->lock);
+       spin_lock_irq(&efivars->lock);
 
        /*
         * Does this variable already exist?
@@ -929,7 +931,7 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
                }
        }
        if (!found) {
-               spin_unlock(&efivars->lock);
+               spin_unlock_irq(&efivars->lock);
                return -EINVAL;
        }
        /* force the Attributes/DataSize to 0 to ensure deletion */
@@ -945,12 +947,12 @@ static ssize_t efivar_delete(struct file *filp, struct kobject *kobj,
        if (status != EFI_SUCCESS) {
                printk(KERN_WARNING "efivars: set_variable() failed: status=%lx\n",
                        status);
-               spin_unlock(&efivars->lock);
+               spin_unlock_irq(&efivars->lock);
                return -EIO;
        }
        list_del(&search_efivar->list);
        /* We need to release this lock before unregistering. */
-       spin_unlock(&efivars->lock);
+       spin_unlock_irq(&efivars->lock);
        efivar_unregister(search_efivar);
 
        /* It's dead Jim.... */
@@ -1058,9 +1060,9 @@ efivar_create_sysfs_entry(struct efivars *efivars,
        kfree(short_name);
        short_name = NULL;
 
-       spin_lock(&efivars->lock);
+       spin_lock_irq(&efivars->lock);
        list_add(&new_efivar->list, &efivars->list);
-       spin_unlock(&efivars->lock);
+       spin_unlock_irq(&efivars->lock);
 
        return 0;
 }
@@ -1129,9 +1131,9 @@ void unregister_efivars(struct efivars *efivars)
        struct efivar_entry *entry, *n;
 
        list_for_each_entry_safe(entry, n, &efivars->list, list) {
-               spin_lock(&efivars->lock);
+               spin_lock_irq(&efivars->lock);
                list_del(&entry->list);
-               spin_unlock(&efivars->lock);
+               spin_unlock_irq(&efivars->lock);
                efivar_unregister(entry);
        }
        if (efivars->new_var)