From 22ed1a1c1cceebff380b3f6f84d520a0b398509a Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Mon, 30 May 2016 16:52:04 +0200 Subject: [PATCH] iio: as3935: improve error reporting in as3935_event_work MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit gcc warns about a potentially uninitialized variable use in as3935_event_work: drivers/iio/proximity/as3935.c: In function ‘as3935_event_work’: drivers/iio/proximity/as3935.c:231:6: error: ‘val’ may be used uninitialized in this function [-Werror=maybe-uninitialized] This case specifically happens when spi_w8r8() fails with a negative return code. We check all other users of this function except this one. As the error is rather unlikely to happen after the device has already been initialized, this just adds a dev_warn(). Another warning already exists in the same function, but is missing a trailing '\n' character, so I'm fixing that too. Signed-off-by: Arnd Bergmann Reviewed-by: Matt Ranostay Signed-off-by: Jonathan Cameron --- drivers/iio/proximity/as3935.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/iio/proximity/as3935.c b/drivers/iio/proximity/as3935.c index c12fde23c7ef..a9d58472e304 100644 --- a/drivers/iio/proximity/as3935.c +++ b/drivers/iio/proximity/as3935.c @@ -224,10 +224,16 @@ static void as3935_event_work(struct work_struct *work) { struct as3935_state *st; int val; + int ret; st = container_of(work, struct as3935_state, work.work); - as3935_read(st, AS3935_INT, &val); + ret = as3935_read(st, AS3935_INT, &val); + if (ret) { + dev_warn(&st->spi->dev, "read error\n"); + return; + } + val &= AS3935_INT_MASK; switch (val) { @@ -235,7 +241,7 @@ static void as3935_event_work(struct work_struct *work) iio_trigger_poll(st->trig); break; case AS3935_NOISE_INT: - dev_warn(&st->spi->dev, "noise level is too high"); + dev_warn(&st->spi->dev, "noise level is too high\n"); break; } } -- 2.20.1