tpm_tis: fix tis_lock with respect to RCU
cleanup_tis() -> tpm_remove_hardware() -> syncrhonize_rcu() is being
called in an atomic context (tis_lock spinlock held), which is not
allowed. Convert tis_lock to mutex.
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Tested-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Acked-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index a174862..70fac9a 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -76,7 +76,7 @@
#define TPM_RID(l) (0x0F04 | ((l) << 12))
static LIST_HEAD(tis_chips);
-static DEFINE_SPINLOCK(tis_lock);
+static DEFINE_MUTEX(tis_lock);
#if defined(CONFIG_PNP) && defined(CONFIG_ACPI)
static int is_itpm(struct pnp_dev *dev)
@@ -689,9 +689,9 @@
}
INIT_LIST_HEAD(&chip->vendor.list);
- spin_lock(&tis_lock);
+ mutex_lock(&tis_lock);
list_add(&chip->vendor.list, &tis_chips);
- spin_unlock(&tis_lock);
+ mutex_unlock(&tis_lock);
return 0;
@@ -855,7 +855,7 @@
{
struct tpm_vendor_specific *i, *j;
struct tpm_chip *chip;
- spin_lock(&tis_lock);
+ mutex_lock(&tis_lock);
list_for_each_entry_safe(i, j, &tis_chips, list) {
chip = to_tpm_chip(i);
tpm_remove_hardware(chip->dev);
@@ -871,7 +871,7 @@
iounmap(i->iobase);
list_del(&i->list);
}
- spin_unlock(&tis_lock);
+ mutex_unlock(&tis_lock);
#ifdef CONFIG_PNP
if (!force) {
pnp_unregister_driver(&tis_pnp_driver);