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| author | Aditya Pakki <pakki001@umn.edu> | 2019-01-07 11:53:59 -0800 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2019-01-07 11:59:57 -0800 |
| commit | e85bb0beb6498c0dffe18a2f1f16d575bc175c32 (patch) | |
| tree | 59b68bc824a4efc4515f8782cc4f53b0c363d4d2 /drivers/input/touchscreen/ad7879.c | |
| parent | 1cdbd3e57698fa22eddb522b2c7fa6048420da5f (diff) | |
| download | linux-e85bb0beb6498c0dffe18a2f1f16d575bc175c32.tar.gz linux-e85bb0beb6498c0dffe18a2f1f16d575bc175c32.tar.bz2 linux-e85bb0beb6498c0dffe18a2f1f16d575bc175c32.zip | |
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>
Diffstat (limited to 'drivers/input/touchscreen/ad7879.c')
| -rw-r--r-- | drivers/input/touchscreen/ad7879.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/input/touchscreen/ad7879.c b/drivers/input/touchscreen/ad7879.c index 6fa714c587b4..3a016f43fb85 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; |