From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Return-Path: From: Nicolin Chen To: thierry.reding@gmail.com, sboyd@codeaurora.org, pdeschrijver@nvidia.com Cc: linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org, linux-clk@vger.kernel.org, jonathanh@nvidia.com, mturquette@baylibre.com, pgaikwad@nvidia.com Subject: [PATCH v2] clk: tegra: Use readl_relaxed_poll_timeout_atomic in tegra210_clock_init Date: Fri, 15 Sep 2017 12:10:13 -0700 Message-Id: <1505502613-11801-1-git-send-email-nicoleotsuka@gmail.com> List-ID: 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 Acked-By: Peter De Schrijver --- Changelog v2: * Corrected a typo in the commit log * Added Peter's Acked-by. 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 0b9789a..ea695c4 100644 --- a/drivers/clk/tegra/clk-tegra210.c +++ b/drivers/clk/tegra/clk-tegra210.c @@ -2587,8 +2587,8 @@ 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; -- 2.1.4