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From:   Sasha Levin <Alexander.Levin@microsoft.com>
To:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "stable@vger.kernel.org" <stable@vger.kernel.org>
CC:     David Lechner <david@lechnology.com>,
        Stephen Boyd <sboyd@codeaurora.org>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.4 163/167] clk: fix reentrancy of clk_enable()
 on UP systems
Thread-Topic: [PATCH AUTOSEL for 4.4 163/167] clk: fix reentrancy of
 clk_enable() on UP systems
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Date:   Mon, 19 Mar 2018 16:08:47 +0000
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From: David Lechner <david@lechnology.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=3Dn (and CONFIG_DEBUG_SPINLOCK=3Dn) 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@codeaurora.org>
Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.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 f13c3f4228d4..a20538c4c2fa 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;
=20
-	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 =3D=3D current) {
 			enable_refcnt++;
 			__acquire(enable_lock);
+			if (!IS_ENABLED(CONFIG_SMP))
+				local_save_flags(flags);
 			return flags;
 		}
 		spin_lock_irqsave(&enable_lock, flags);
--=20
2.14.1