linux-kernel - [PATCH 4.14 092/178] clk: tegra: Use readl_relaxed_poll_timeout_atomic() in tegra210_clock

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Date:   Mon, 18 Dec 2017 16:48:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Nicolin Chen <nicoleotsuka@...il.com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Thierry Reding <treding@...dia.com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.14 092/178] clk: tegra: Use readl_relaxed_poll_timeout_atomic() in tegra210_clock_init()

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

------------------

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/clk/tegra/clk-tegra210.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- 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;