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Fri, 01 May 2026 02:57:25 -0700 (PDT) From: Pengyu Luo To: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Frank Li , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Sakari Ailus , Martin Kepplinger-Novakovic , Mauro Carvalho Chehab , Hans Verkuil Cc: devicetree@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, Pengyu Luo Subject: [PATCH v2 1/4] media: hi846: fix hi846_write_reg_16 handling Date: Fri, 1 May 2026 17:54:30 +0800 Message-ID: <20260501095433.1609309-2-mitltlatltl@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260501095433.1609309-1-mitltlatltl@gmail.com> References: <20260501095433.1609309-1-mitltlatltl@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit hi846_write_reg_16() does not clear a positive *err value on success. pm_runtime_get_if_in_use() returns a positive value when the device is already in use. When hi846_set_ctrl() passes &ret holding this positive value) to hi846_write_reg_16(), the function returns with ret as is, the positive value propagates back as a return code, which callers interpret as an error. Fix this by resetting *err to 0 only when it is positive. Fixes: 04fc06f6dc15 ("media: hi846: fix usage of pm_runtime_get_if_in_use()") Signed-off-by: Pengyu Luo --- remove `else` in v2 --- drivers/media/i2c/hi846.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/media/i2c/hi846.c b/drivers/media/i2c/hi846.c index a3f77b8434ca..7f069aca0fce 100644 --- a/drivers/media/i2c/hi846.c +++ b/drivers/media/i2c/hi846.c @@ -1271,6 +1271,8 @@ static void hi846_write_reg_16(struct hi846 *hi846, u16 reg, u16 val, int *err) if (*err < 0) return; + *err = 0; + put_unaligned_be16(reg, buf); put_unaligned_be16(val, buf + 2); ret = i2c_master_send(client, buf, sizeof(buf)); -- 2.54.0