From bd5121bbb6b9a89d9d13878fa5bb1e833168ae18 Mon Sep 17 00:00:00 2001 From: Russell King Date: Mon, 16 Dec 2013 12:38:30 +0000 Subject: imx-drm: imx-tve: don't call sleeping functions beneath enable_lock spinlock Enable lock claims that it is serializing tve_enable/disable calls. However, DRM already serialises mode sets with a mutex, which prevents encoder/connector functions being called concurrently. Secondly, holding a spinlock while calling clk_prepare_enable() is wrong; it will cause a might_sleep() warning should that debugging be enabled. So, let's just get rid of the enable_lock. Signed-off-by: Russell King Acked-by: Sascha Hauer Signed-off-by: Greg Kroah-Hartman --- drivers/staging/imx-drm/imx-tve.c | 9 --------- 1 file changed, 9 deletions(-) (limited to 'drivers') diff --git a/drivers/staging/imx-drm/imx-tve.c b/drivers/staging/imx-drm/imx-tve.c index 680f4c8fa081..2c44fef8d58b 100644 --- a/drivers/staging/imx-drm/imx-tve.c +++ b/drivers/staging/imx-drm/imx-tve.c @@ -114,7 +114,6 @@ struct imx_tve { struct drm_encoder encoder; struct imx_drm_encoder *imx_drm_encoder; struct device *dev; - spinlock_t enable_lock; /* serializes tve_enable/disable */ spinlock_t lock; /* register lock */ bool enabled; int mode; @@ -146,10 +145,8 @@ __releases(&tve->lock) static void tve_enable(struct imx_tve *tve) { - unsigned long flags; int ret; - spin_lock_irqsave(&tve->enable_lock, flags); if (!tve->enabled) { tve->enabled = true; clk_prepare_enable(tve->clk); @@ -169,23 +166,18 @@ static void tve_enable(struct imx_tve *tve) TVE_CD_SM_IEN | TVE_CD_LM_IEN | TVE_CD_MON_END_IEN); - - spin_unlock_irqrestore(&tve->enable_lock, flags); } static void tve_disable(struct imx_tve *tve) { - unsigned long flags; int ret; - spin_lock_irqsave(&tve->enable_lock, flags); if (tve->enabled) { tve->enabled = false; ret = regmap_update_bits(tve->regmap, TVE_COM_CONF_REG, TVE_IPU_CLK_EN | TVE_EN, 0); clk_disable_unprepare(tve->clk); } - spin_unlock_irqrestore(&tve->enable_lock, flags); } static int tve_setup_tvout(struct imx_tve *tve) @@ -601,7 +593,6 @@ static int imx_tve_probe(struct platform_device *pdev) tve->dev = &pdev->dev; spin_lock_init(&tve->lock); - spin_lock_init(&tve->enable_lock); ddc_node = of_parse_phandle(np, "ddc", 0); if (ddc_node) { -- cgit v1.2.3