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Input: ad7879 - add check for read errors in interrupt 

regmap_bulk_read() can return a non zero value on failure. The fix checks
if the function call succeeded before calling mod_timer. The issue was
identified by a static analysis tool.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
hifive-unleashed-5.1
Aditya Pakki 2019-01-07 11:53:59 -08:00 committed by Dmitry Torokhov
parent 1cdbd3e576
commit e85bb0beb6
1 changed files with 7 additions and 4 deletions
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11
drivers/input/touchscreen/ad7879.c
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@ -246,11 +246,14 @@ static void ad7879_timer(struct timer_list *t)
static irqreturn_t ad7879_irq(int irq, void *handle)
{
struct ad7879 *ts = handle;
int error;
regmap_bulk_read(ts->regmap, AD7879_REG_XPLUS,
ts->conversion_data, AD7879_NR_SENSE);
if (!ad7879_report(ts))
error = regmap_bulk_read(ts->regmap, AD7879_REG_XPLUS,
ts->conversion_data, AD7879_NR_SENSE);
if (error)
dev_err_ratelimited(ts->dev, "failed to read %#02x: %d\n",
AD7879_REG_XPLUS, error);
else if (!ad7879_report(ts))
mod_timer(&ts->timer, jiffies + TS_PEN_UP_TIMEOUT);
return IRQ_HANDLED;