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([2001:818:ea56:d000:56e0:ceba:7da4:6673]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48e6db0b08asm24056555e9.8.2026.05.09.01.41.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 09 May 2026 01:41:11 -0700 (PDT) Message-ID: Subject: Re: [PATCH] staging: iio: addac: adt7316: check SPI write errors in probe From: Nuno =?ISO-8859-1?Q?S=E1?= To: Hungyu Lin , linux-iio@vger.kernel.org, Jonathan Cameron Cc: Lars-Peter Clausen , Michael Hennerich , David Lechner , Nuno =?ISO-8859-1?Q?S=E1?= , Andy Shevchenko , Greg Kroah-Hartman , linux-kernel@vger.kernel.org, linux-staging@lists.linux.dev Date: Sat, 09 May 2026 09:42:12 +0100 In-Reply-To: <20260509082636.85114-1-dennylin0707@gmail.com> References: <20260509082636.85114-1-dennylin0707@gmail.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-2.fc42) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Sat, 2026-05-09 at 08:26 +0000, Hungyu Lin wrote: > The probe function issues three SPI writes to switch the device > from the default I2C protocol to SPI protocol, but ignores their > return values. >=20 > Add error checking and emit a warning if any of these writes fail, > to improve error visibility without changing existing behavior. >=20 > Signed-off-by: Hungyu Lin > --- Hi Hungyu, Small comment from me. With that addressed: Reviewed-by: Nuno S=C3=A1 > =C2=A0drivers/staging/iio/addac/adt7316-spi.c | 9 ++++++--- > =C2=A01 file changed, 6 insertions(+), 3 deletions(-) >=20 > diff --git a/drivers/staging/iio/addac/adt7316-spi.c > b/drivers/staging/iio/addac/adt7316-spi.c > index f91325d11394..25b7772bd05f 100644 > --- a/drivers/staging/iio/addac/adt7316-spi.c > +++ b/drivers/staging/iio/addac/adt7316-spi.c > @@ -98,6 +98,7 @@ static int adt7316_spi_probe(struct spi_device *spi_dev= ) > =C2=A0 .multi_read =3D adt7316_spi_multi_read, > =C2=A0 .multi_write =3D adt7316_spi_multi_write, > =C2=A0 }; > + int i, ret; > =C2=A0 > =C2=A0 /* don't exceed max specified SPI CLK frequency */ > =C2=A0 if (spi_dev->max_speed_hz > ADT7316_SPI_MAX_FREQ_HZ) { > @@ -107,9 +108,11 @@ static int adt7316_spi_probe(struct spi_device *spi_= dev) > =C2=A0 } > =C2=A0 > =C2=A0 /* switch from default I2C protocol to SPI protocol */ > - adt7316_spi_write(spi_dev, 0, 0); > - adt7316_spi_write(spi_dev, 0, 0); > - adt7316_spi_write(spi_dev, 0, 0); > + for (i =3D 0; i < 3; i++) { > + ret =3D adt7316_spi_write(spi_dev, 0, 0); > + if (ret) > + dev_warn(&spi_dev->dev, "SPI init write %d failed: %d\n", > i, ret); > + } Hmm this is a bit useless no :)? Agree we should check for error codes but = we should bail in case of errors. You can also mention the loop() introduction. =20 - Nuno S=C3=A1 > =C2=A0 > =C2=A0 return adt7316_probe(&spi_dev->dev, &bus, spi_dev->modalias); > =C2=A0}