[PATCH 2/8] staging: omap-thermal: use spin_lock_irqsave inside IRQ handler

From: Eduardo Valentin
Date: Mon Mar 18 2013 - 11:00:54 EST

Even if the IRQ is not firing because it is ONE_SHOT and disable
at INTC level, the IRQ handler must use spin_lock_irqsave.
It is necessary to disable IRQs from the current
CPU while it is holding a spin_lock which is need.

Cc: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

Signed-off-by: Eduardo Valentin <eduardo.valentin@xxxxxx>

diff --git a/drivers/staging/omap-thermal/omap-bandgap.c b/drivers/staging/omap-thermal/omap-bandgap.c
index cb7aa35..a4ac06c 100644
--- a/drivers/staging/omap-thermal/omap-bandgap.c
+++ b/drivers/staging/omap-thermal/omap-bandgap.c
@@ -168,9 +168,10 @@ static irqreturn_t omap_bandgap_talert_irq_handler(int irq, void *data)
struct omap_bandgap *bg_ptr = data;
struct temp_sensor_registers *tsr;
u32 t_hot = 0, t_cold = 0, ctrl;
+ unsigned long flags;
int i;

- spin_lock(&bg_ptr->lock);
+ spin_lock_irqsave(&bg_ptr->lock, flags);
for (i = 0; i < bg_ptr->conf->sensor_count; i++) {
tsr = bg_ptr->conf->sensors[i].registers;
ctrl = omap_bandgap_readl(bg_ptr, tsr->bgap_status);
@@ -209,7 +210,7 @@ static irqreturn_t omap_bandgap_talert_irq_handler(int irq, void *data)
if (bg_ptr->conf->report_temperature)
bg_ptr->conf->report_temperature(bg_ptr, i);
- spin_unlock(&bg_ptr->lock);
+ spin_unlock_irqrestore(&bg_ptr->lock, flags);


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