linux-kernel - [PATCH AUTOSEL for 4.14 78/97] clk: fix reentrancy of clk

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Message-ID: <20180319155411.12348-78-alexander.levin@microsoft.com>
Date:   Mon, 19 Mar 2018 15:56:14 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     David Lechner <david@...hnology.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.14 78/97] clk: fix reentrancy of clk_enable() on
 UP systems

From: David Lechner <david@...hnology.com>

[ Upstream commit a12aa8a68dfef5de181f2e555aa950a0ab05411f ]

Reentrant calls to clk_enable() are not working on UP systems. This is
caused by the fact spin_trylock_irqsave() always returns true when
CONFIG_SMP=n (and CONFIG_DEBUG_SPINLOCK=n) which causes the reference
counting to not work correctly when clk_enable_lock() is called twice
before clk_enable_unlock() is called (this happens when clk_enable()
is called from within another clk_enable()).

This fixes the problem by skipping the call to spin_trylock_irqsave() on UP
systems and relying solely on reference counting. We also make sure to set
flags in this case so that we are not returning an uninitialized value.

Suggested-by: Stephen Boyd <sboyd@...eaurora.org>
Signed-off-by: David Lechner <david@...hnology.com>
Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/clk/clk.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index c8d83acda006..f6c9d6205d85 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -119,10 +119,18 @@ static unsigned long clk_enable_lock(void)
 {
 	unsigned long flags;
 
-	if (!spin_trylock_irqsave(&enable_lock, flags)) {
+	/*
+	 * On UP systems, spin_trylock_irqsave() always returns true, even if
+	 * we already hold the lock. So, in that case, we rely only on
+	 * reference counting.
+	 */
+	if (!IS_ENABLED(CONFIG_SMP) ||
+	    !spin_trylock_irqsave(&enable_lock, flags)) {
 		if (enable_owner == current) {
 			enable_refcnt++;
 			__acquire(enable_lock);
+			if (!IS_ENABLED(CONFIG_SMP))
+				local_save_flags(flags);
 			return flags;
 		}
 		spin_lock_irqsave(&enable_lock, flags);
-- 
2.14.1