mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-29 13:53:33 +00:00
Code Issues Releases Wiki Activity

mfd: ti_am335x_tscadc: Avoid possible deadlock of reg_lock

Browse source 
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 <bigeasy@linutronix.de>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Sebastian Andrzej Siewior 2013-10-22 16:12:39 +02:00 committed by Lee Jones
parent df73de9b0d
commit 317b209993
1 changed files with 8 additions and 4 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/mfd/ti_am335x_tscadc.c
View file

@ -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);