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(61-220-246-151.hinet-ip.hinet.net. [61.220.246.151]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cb51a2c2a13sm1286746a12.31.2026.07.17.12.37.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Jul 2026 12:37:06 -0700 (PDT) From: Cosmo Chou To: alexandre.belloni@bootlin.com Cc: linux-rtc@vger.kernel.org, linux-kernel@vger.kernel.org, cosmo.chou@quantatw.com, Cosmo Chou Subject: [PATCH v2] rtc: pcf85363: Add error checking to regmap calls in probe() Date: Sat, 18 Jul 2026 03:37:05 +0800 Message-ID: <20260717193705.2003175-1-chou.cosmo@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The probe() function ignores errors returned by regmap operations. If an I2C transport error occurs (e.g., -ENXIO), the driver continues probing and may register a non-functional RTC device. Propagate errors from all unchecked regmap calls in probe() using dev_err_probe(). Fixes: fd9a6a13949a ("rtc: pcf85363: add support for the quartz-load-femtofarads property") Signed-off-by: Cosmo Chou --- Changes in v2 [1]: - Update commit message to reflect the new scope of the fix - Add error checking to all remaining regmap calls in probe() (regmap_write to CTRL_FLAGS and regmap_update_bits to CTRL_PIN_IO) [1] https://lore.kernel.org/linux-rtc/20260716125142.1801599-1-chou.cosmo@gmail.com/ drivers/rtc/rtc-pcf85363.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/rtc/rtc-pcf85363.c b/drivers/rtc/rtc-pcf85363.c index 540042b9eec8..ccc7834e5759 100644 --- a/drivers/rtc/rtc-pcf85363.c +++ b/drivers/rtc/rtc-pcf85363.c @@ -426,8 +426,8 @@ static int pcf85363_probe(struct i2c_client *client) err = pcf85363_load_capacitance(pcf85363, client->dev.of_node); if (err < 0) - dev_warn(&client->dev, "failed to set xtal load capacitance: %d", - err); + return dev_err_probe(&client->dev, err, + "failed to set xtal load capacitance\n"); pcf85363->rtc->ops = &rtc_ops; pcf85363->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; @@ -436,9 +436,16 @@ static int pcf85363_probe(struct i2c_client *client) wakeup_source = device_property_read_bool(&client->dev, "wakeup-source"); if (client->irq > 0 || wakeup_source) { - regmap_write(pcf85363->regmap, CTRL_FLAGS, 0); - regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO, - PIN_IO_INTAPM, PIN_IO_INTA_OUT); + err = regmap_write(pcf85363->regmap, CTRL_FLAGS, 0); + if (err) + return dev_err_probe(&client->dev, err, + "failed to clear flags\n"); + + err = regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO, + PIN_IO_INTAPM, PIN_IO_INTA_OUT); + if (err) + return dev_err_probe(&client->dev, err, + "failed to set interrupt pin mode\n"); } if (client->irq > 0) { -- 2.43.0