Patch "clk: tegra: Use readl_relaxed_poll_timeout_atomic() in tegra210_clock_init()" has been added to the 4.14-stable tree

Patch "clk: tegra: Use readl_relaxed_poll_timeout_atomic() in tegra210_clock_init()" has been added to the 4.14-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    clk: tegra: Use readl_relaxed_poll_timeout_atomic() in tegra210_clock_init()

to the 4.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     clk-tegra-use-readl_relaxed_poll_timeout_atomic-in-tegra210_clock_init.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Dec 18 13:28:59 CET 2017
From: Nicolin Chen <nicoleotsuka@gmail.com>
Date: Fri, 15 Sep 2017 12:10:13 -0700
Subject: clk: tegra: Use readl_relaxed_poll_timeout_atomic() in tegra210_clock_init()

From: Nicolin Chen <nicoleotsuka@gmail.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@gmail.com>
Acked-By: Peter De Schrijver <pdeschrijver@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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;


Patches currently in stable-queue which might be from nicoleotsuka@gmail.com are

queue-4.14/clk-tegra-use-readl_relaxed_poll_timeout_atomic-in-tegra210_clock_init.patch