From: Stefan Popa Date: Thu, 14 Sep 2017 13:50:28 +0000 (+0300) Subject: staging: iio: ad7192: Fix - use the dedicated reset function avoiding dma from stack. X-Git-Tag: v4.9.55~75 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8edd1ce3e56b4a383d60273d008d35d70e367956;p=profile%2Fwearable%2Fplatform%2Fkernel%2Flinux-4.9-exynos9110.git staging: iio: ad7192: Fix - use the dedicated reset function avoiding dma from stack. commit f790923f146140a261ad211e5baf75d169f16fb2 upstream. Depends on: 691c4b95d1 ("iio: ad_sigma_delta: Implement a dedicated reset function") SPI host drivers can use DMA to transfer data, so the buffer should be properly allocated. Keeping it on the stack could cause an undefined behavior. The dedicated reset function solves this issue. Signed-off-by: Stefan Popa Acked-by: Lars-Peter Clausen Acked-by: Michael Hennerich Signed-off-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/iio/adc/ad7192.c b/drivers/staging/iio/adc/ad7192.c index 1cf6b79..eeacb0e 100644 --- a/drivers/staging/iio/adc/ad7192.c +++ b/drivers/staging/iio/adc/ad7192.c @@ -222,11 +222,9 @@ static int ad7192_setup(struct ad7192_state *st, struct iio_dev *indio_dev = spi_get_drvdata(st->sd.spi); unsigned long long scale_uv; int i, ret, id; - u8 ones[6]; /* reset the serial interface */ - memset(&ones, 0xFF, 6); - ret = spi_write(st->sd.spi, &ones, 6); + ret = ad_sd_reset(&st->sd, 48); if (ret < 0) goto out; usleep_range(500, 1000); /* Wait for at least 500us */