From: Sebastian Andrzej Siewior Date: Tue, 22 Oct 2013 14:12:39 +0000 (+0200) Subject: mfd: ti_am335x_tscadc: Avoid possible deadlock of reg_lock X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=317b2099938fe6f27e51c4b58e76f4de8212d3e6;p=linux-beck.git mfd: ti_am335x_tscadc: Avoid possible deadlock of reg_lock Since the addition of continuous sampling mode and shared irq support, the reg_lock lock can be taken with and without interrupts. This patch uses the *_irq* variant which should be used in order to avaoid a deadlock. Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Lee Jones --- diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c index e5a40e8a0904..88718abfb9ba 100644 --- a/drivers/mfd/ti_am335x_tscadc.c +++ b/drivers/mfd/ti_am335x_tscadc.c @@ -56,21 +56,25 @@ EXPORT_SYMBOL_GPL(am335x_tsc_se_update); void am335x_tsc_se_set(struct ti_tscadc_dev *tsadc, u32 val) { - spin_lock(&tsadc->reg_lock); + unsigned long flags; + + spin_lock_irqsave(&tsadc->reg_lock, flags); tsadc->reg_se_cache = tscadc_readl(tsadc, REG_SE); tsadc->reg_se_cache |= val; am335x_tsc_se_update(tsadc); - spin_unlock(&tsadc->reg_lock); + spin_unlock_irqrestore(&tsadc->reg_lock, flags); } EXPORT_SYMBOL_GPL(am335x_tsc_se_set); void am335x_tsc_se_clr(struct ti_tscadc_dev *tsadc, u32 val) { - spin_lock(&tsadc->reg_lock); + unsigned long flags; + + spin_lock_irqsave(&tsadc->reg_lock, flags); tsadc->reg_se_cache = tscadc_readl(tsadc, REG_SE); tsadc->reg_se_cache &= ~val; am335x_tsc_se_update(tsadc); - spin_unlock(&tsadc->reg_lock); + spin_unlock_irqrestore(&tsadc->reg_lock, flags); } EXPORT_SYMBOL_GPL(am335x_tsc_se_clr);