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%3Ba=su...
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