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Subject[PATCH] [v2] Input: touchscreen: Fix a missing check on regmap_bulk_read
Date
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>
---
drivers/input/touchscreen/ad7879.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/input/touchscreen/ad7879.c b/drivers/input/touchscreen/ad7879.c
index 6fa714c587b4..8c908572c1f2 100644
--- a/drivers/input/touchscreen/ad7879.c
+++ b/drivers/input/touchscreen/ad7879.c
@@ -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;
--
2.17.1
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