linux-kernel - [PATCH 4.2.y-ckt 205/206] drivers/hwspinlock: use correct radix tree API

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Message-Id: <1465507015-23052-206-git-send-email-kamal@canonical.com>
Date:	Thu,  9 Jun 2016 14:16:54 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Matthew Wilcox <willy@...ux.intel.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
	Jan Kara <jack@...e.com>, Neil Brown <neilb@...e.de>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 205/206] drivers/hwspinlock: use correct radix tree API

4.2.8-ckt12 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Matthew Wilcox <willy@...ux.intel.com>

commit b76ba4af4ddd6a06f7f65769e7be1bc56556cdf5 upstream.

radix_tree_is_indirect_ptr() is an internal API.  The correct call to
use is radix_tree_deref_retry() which has the appropriate unlikely()
annotation.

Fixes: c6400ba7e13a ("drivers/hwspinlock: fix race between radix tree insertion and lookup")
Signed-off-by: Matthew Wilcox <willy@...ux.intel.com>
Cc: Konstantin Khlebnikov <koct9i@...il.com>
Cc: Kirill Shutemov <kirill.shutemov@...ux.intel.com>
Cc: Jan Kara <jack@...e.com>
Cc: Neil Brown <neilb@...e.de>
Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/hwspinlock/hwspinlock_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwspinlock/hwspinlock_core.c b/drivers/hwspinlock/hwspinlock_core.c
index d50c701..4074441 100644
--- a/drivers/hwspinlock/hwspinlock_core.c
+++ b/drivers/hwspinlock/hwspinlock_core.c
@@ -313,7 +313,7 @@ int of_hwspin_lock_get_id(struct device_node *np, int index)
 		hwlock = radix_tree_deref_slot(slot);
 		if (unlikely(!hwlock))
 			continue;
-		if (radix_tree_is_indirect_ptr(hwlock)) {
+		if (radix_tree_deref_retry(hwlock)) {
 			slot = radix_tree_iter_retry(&iter);
 			continue;
 		}
-- 
2.7.4