From 52f993b8e89487ec9ee15a7fb4979e0f09a45b27 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Wed, 8 Mar 2017 23:13:28 -0800 Subject: Upgrade to 4.4.50-rt62 The current kernel is based on rt kernel v4.4.6-rt14. We will upgrade it to 4.4.50-rt62. The command to achieve it is: a) Clone a git repo from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-stable-rt.git b) Get the diff between this two changesets: git diff 640eca2901f3435e616157b11379d3223a44b391 705619beeea1b0b48219a683fd1a901a86fdaf5e where the two commits are: [yjiang5@jnakajim-build linux-stable-rt]$ git show --oneline --name-only 640eca2901f3435e616157b11379d3223a44b391 640eca2901f3 v4.4.6-rt14 localversion-rt [yjiang5@jnakajim-build linux-stable-rt]$ git show --oneline --name-only 705619beeea1b0b48219a683fd1a901a86fdaf5e 705619beeea1 Linux 4.4.50-rt62 localversion-rt c) One patch has been backported thus revert the patch before applying. filterdiff -p1 -x scripts/package/Makefile ~/tmp/v4.4.6-rt14-4.4.50-rt62.diff |patch -p1 --dry-run Upstream status: backport Change-Id: I244d57a32f6066e5a5b9915f9fbf99e7bbca6e01 Signed-off-by: Yunhong Jiang --- kernel/drivers/char/hw_random/core.c | 6 +++--- kernel/drivers/char/hw_random/exynos-rng.c | 19 +++++++++++++++---- kernel/drivers/char/hw_random/omap-rng.c | 16 ++++++++++++++-- 3 files changed, 32 insertions(+), 9 deletions(-) (limited to 'kernel/drivers/char/hw_random') diff --git a/kernel/drivers/char/hw_random/core.c b/kernel/drivers/char/hw_random/core.c index 6f497aa1b..cf2502057 100644 --- a/kernel/drivers/char/hw_random/core.c +++ b/kernel/drivers/char/hw_random/core.c @@ -84,14 +84,14 @@ static size_t rng_buffer_size(void) static void add_early_randomness(struct hwrng *rng) { - unsigned char bytes[16]; int bytes_read; + size_t size = min_t(size_t, 16, rng_buffer_size()); mutex_lock(&reading_mutex); - bytes_read = rng_get_data(rng, bytes, sizeof(bytes), 1); + bytes_read = rng_get_data(rng, rng_buffer, size, 1); mutex_unlock(&reading_mutex); if (bytes_read > 0) - add_device_randomness(bytes, bytes_read); + add_device_randomness(rng_buffer, bytes_read); } static inline void cleanup_rng(struct kref *kref) diff --git a/kernel/drivers/char/hw_random/exynos-rng.c b/kernel/drivers/char/hw_random/exynos-rng.c index 30cf46231..7845a38b6 100644 --- a/kernel/drivers/char/hw_random/exynos-rng.c +++ b/kernel/drivers/char/hw_random/exynos-rng.c @@ -89,6 +89,7 @@ static int exynos_read(struct hwrng *rng, void *buf, struct exynos_rng, rng); u32 *data = buf; int retry = 100; + int ret = 4; pm_runtime_get_sync(exynos_rng->dev); @@ -97,23 +98,27 @@ static int exynos_read(struct hwrng *rng, void *buf, while (!(exynos_rng_readl(exynos_rng, EXYNOS_PRNG_STATUS_OFFSET) & PRNG_DONE) && --retry) cpu_relax(); - if (!retry) - return -ETIMEDOUT; + if (!retry) { + ret = -ETIMEDOUT; + goto out; + } exynos_rng_writel(exynos_rng, PRNG_DONE, EXYNOS_PRNG_STATUS_OFFSET); *data = exynos_rng_readl(exynos_rng, EXYNOS_PRNG_OUT1_OFFSET); +out: pm_runtime_mark_last_busy(exynos_rng->dev); pm_runtime_put_sync_autosuspend(exynos_rng->dev); - return 4; + return ret; } static int exynos_rng_probe(struct platform_device *pdev) { struct exynos_rng *exynos_rng; struct resource *res; + int ret; exynos_rng = devm_kzalloc(&pdev->dev, sizeof(struct exynos_rng), GFP_KERNEL); @@ -141,7 +146,13 @@ static int exynos_rng_probe(struct platform_device *pdev) pm_runtime_use_autosuspend(&pdev->dev); pm_runtime_enable(&pdev->dev); - return devm_hwrng_register(&pdev->dev, &exynos_rng->rng); + ret = devm_hwrng_register(&pdev->dev, &exynos_rng->rng); + if (ret) { + pm_runtime_dont_use_autosuspend(&pdev->dev); + pm_runtime_disable(&pdev->dev); + } + + return ret; } #ifdef CONFIG_PM diff --git a/kernel/drivers/char/hw_random/omap-rng.c b/kernel/drivers/char/hw_random/omap-rng.c index 8a1432e8b..f5c26a5f6 100644 --- a/kernel/drivers/char/hw_random/omap-rng.c +++ b/kernel/drivers/char/hw_random/omap-rng.c @@ -384,7 +384,12 @@ static int omap_rng_probe(struct platform_device *pdev) } pm_runtime_enable(&pdev->dev); - pm_runtime_get_sync(&pdev->dev); + ret = pm_runtime_get_sync(&pdev->dev); + if (ret < 0) { + dev_err(&pdev->dev, "Failed to runtime_get device: %d\n", ret); + pm_runtime_put_noidle(&pdev->dev); + goto err_ioremap; + } ret = (dev->of_node) ? of_get_omap_rng_device_details(priv, pdev) : get_omap_rng_device_details(priv); @@ -435,8 +440,15 @@ static int __maybe_unused omap_rng_suspend(struct device *dev) static int __maybe_unused omap_rng_resume(struct device *dev) { struct omap_rng_dev *priv = dev_get_drvdata(dev); + int ret; + + ret = pm_runtime_get_sync(dev); + if (ret < 0) { + dev_err(dev, "Failed to runtime_get device: %d\n", ret); + pm_runtime_put_noidle(dev); + return ret; + } - pm_runtime_get_sync(dev); priv->pdata->init(priv); return 0; -- cgit 1.2.3-korg