linux-kernel - [PATCH AUTOSEL for 4.14 047/135] clk: tegra: Use readl_relaxed_poll_timeout_atomic() in tegra210_clock

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Message-ID: <20171207154513.4154-47-alexander.levin@verizon.com>
Date:   Thu, 7 Dec 2017 15:45:41 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Nicolin Chen <nicoleotsuka@...il.com>,
        Thierry Reding <treding@...dia.com>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.14 047/135] clk: tegra: Use
 readl_relaxed_poll_timeout_atomic() in tegra210_clock_init()

From: Nicolin Chen <nicoleotsuka@...il.com>

[ Upstream commit 22ef01a203d27fee8b7694020b7e722db7efd2a7 ]

Below is the call trace of tegra210_init_pllu() function:
  start_kernel()
  -> time_init()
  --> of_clk_init()
  ---> tegra210_clock_init()
  ----> tegra210_pll_init()
  -----> tegra210_init_pllu()

Because the preemption is disabled in the start_kernel before calling
time_init, tegra210_init_pllu is actually in an atomic context while
it includes a readl_relaxed_poll_timeout that might sleep.

So this patch just changes this readl_relaxed_poll_timeout() to its
atomic version.

Signed-off-by: Nicolin Chen <nicoleotsuka@...il.com>
Acked-By: Peter De Schrijver <pdeschrijver@...dia.com>
Signed-off-by: Thierry Reding <treding@...dia.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/clk/tegra/clk-tegra210.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/tegra/clk-tegra210.c b/drivers/clk/tegra/clk-tegra210.c
index 6d7a613f2656..b92867814e2d 100644
--- a/drivers/clk/tegra/clk-tegra210.c
+++ b/drivers/clk/tegra/clk-tegra210.c
@@ -2566,8 +2566,8 @@ static int tegra210_enable_pllu(void)
 	reg |= PLL_ENABLE;
 	writel(reg, clk_base + PLLU_BASE);
 
-	readl_relaxed_poll_timeout(clk_base + PLLU_BASE, reg,
-				   reg & PLL_BASE_LOCK, 2, 1000);
+	readl_relaxed_poll_timeout_atomic(clk_base + PLLU_BASE, reg,
+					  reg & PLL_BASE_LOCK, 2, 1000);
 	if (!(reg & PLL_BASE_LOCK)) {
 		pr_err("Timed out waiting for PLL_U to lock\n");
 		return -ETIMEDOUT;
-- 
2.11.0