linux-kernel - [PATCH 3.13 033/103] firmware: Do not use WARN_ON(!spin_is

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Message-Id: <1412112708-27356-34-git-send-email-kamal@canonical.com>
Date:	Tue, 30 Sep 2014 14:30:38 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Guenter Roeck <linux@...ck-us.net>,
	Matt Fleming <matt.fleming@...el.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 033/103] firmware: Do not use WARN_ON(!spin_is_locked())

3.13.11.8 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Guenter Roeck <linux@...ck-us.net>

commit aee530cfecf4f3ec83b78406bac618cec35853f8 upstream.

spin_is_locked() always returns false for uniprocessor configurations
in several architectures, so do not use WARN_ON with it.
Use lockdep_assert_held() instead to also reduce overhead in
non-debug kernels.

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Matt Fleming <matt.fleming@...el.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/firmware/efi/vars.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/firmware/efi/vars.c b/drivers/firmware/efi/vars.c
index b22659c..e612552 100644
--- a/drivers/firmware/efi/vars.c
+++ b/drivers/firmware/efi/vars.c
@@ -481,7 +481,7 @@ EXPORT_SYMBOL_GPL(efivar_entry_remove);
  */
 static void efivar_entry_list_del_unlock(struct efivar_entry *entry)
 {
-	WARN_ON(!spin_is_locked(&__efivars->lock));
+	lockdep_assert_held(&__efivars->lock);
 
 	list_del(&entry->list);
 	spin_unlock_irq(&__efivars->lock);
@@ -507,7 +507,7 @@ int __efivar_entry_delete(struct efivar_entry *entry)
 	const struct efivar_operations *ops = __efivars->ops;
 	efi_status_t status;
 
-	WARN_ON(!spin_is_locked(&__efivars->lock));
+	lockdep_assert_held(&__efivars->lock);
 
 	status = ops->set_variable(entry->var.VariableName,
 				   &entry->var.VendorGuid,
@@ -667,7 +667,7 @@ struct efivar_entry *efivar_entry_find(efi_char16_t *name, efi_guid_t guid,
 	int strsize1, strsize2;
 	bool found = false;
 
-	WARN_ON(!spin_is_locked(&__efivars->lock));
+	lockdep_assert_held(&__efivars->lock);
 
 	list_for_each_entry_safe(entry, n, head, list) {
 		strsize1 = ucs2_strsize(name, 1024);
@@ -739,7 +739,7 @@ int __efivar_entry_get(struct efivar_entry *entry, u32 *attributes,
 	const struct efivar_operations *ops = __efivars->ops;
 	efi_status_t status;
 
-	WARN_ON(!spin_is_locked(&__efivars->lock));
+	lockdep_assert_held(&__efivars->lock);
 
 	status = ops->get_variable(entry->var.VariableName,
 				   &entry->var.VendorGuid,
-- 
1.9.1

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