linux-kernel - [PATCH 4.4 48/91] drivers/hwspinlock: use correct radix tree API

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Message-Id: <20200401161530.338453012@linuxfoundation.org>
Date:   Wed,  1 Apr 2020 18:17:44 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, 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>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.4 48/91] drivers/hwspinlock: use correct radix tree API

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

[ Upstream commit b76ba4af4ddd6a06f7f65769e7be1bc56556cdf5 ]

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: Sasha Levin <sashal@...nel.org>
---
 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 d50c701b19d67..4074441444fed 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;
 		}
-- 
2.20.1