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Wed, 16 Sep 2026 13:53:30 -0700 (PDT) From: Antoni Pokusinski To: alexandre.belloni@bootlin.com, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org Cc: linux-rtc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Antoni Pokusinski Subject: [PATCH v7 2/9] rtc: abx80x: fix error check after i2c_smbus_read in read_alarm() Date: Wed, 16 Sep 2026 22:51:31 +0200 Message-ID: <20260916205138.16771-3-apokusinski01@gmail.com> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260916205138.16771-1-apokusinski01@gmail.com> References: <20260916205138.16771-1-apokusinski01@gmail.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit i2c_smbus_read_i2c_block_data() returns the number of bytes read on success and a negative error code on failure. The existing code treated any non-zero return value as an error. Fix the error handling by checking only for negative return values. Fixes: 718a820a303c ("rtc: abx80x: add alarm support") Signed-off-by: Antoni Pokusinski --- drivers/rtc/rtc-abx80x.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c index 5486d9d0b1e5..e4fd7b5d4b11 100644 --- a/drivers/rtc/rtc-abx80x.c +++ b/drivers/rtc/rtc-abx80x.c @@ -294,8 +294,10 @@ static int abx80x_read_alarm(struct device *dev, struct rtc_wkalrm *t) err = i2c_smbus_read_i2c_block_data(client, ABX8XX_REG_ASC, sizeof(buf), buf); - if (err) + if (err < 0) return err; + if (err < ARRAY_SIZE(buf)) + return -EIO; irq_mask = i2c_smbus_read_byte_data(client, ABX8XX_REG_IRQ); if (irq_mask < 0) @@ -311,7 +313,7 @@ static int abx80x_read_alarm(struct device *dev, struct rtc_wkalrm *t) t->enabled = !!(irq_mask & ABX8XX_IRQ_AIE); t->pending = (buf[6] & ABX8XX_STATUS_AF) && t->enabled; - return err; + return 0; } static int abx80x_set_alarm(struct device *dev, struct rtc_wkalrm *t) -- 2.55.0