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From:   Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
To:     vkoul@kernel.org
Cc:     yung-chuan.liao@linux.intel.com,
        pierre-louis.bossart@linux.intel.com, sanyog.r.kale@intel.com,
        alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org,
        robh@kernel.org, devicetree@vger.kernel.org,
        Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
        coverity-bot <keescook+coverity-bot@chromium.org>
Subject: [PATCH] soundwire: qcom: handle return correctly in qcom_swrm_transport_params
Date:   Thu,  1 Apr 2021 10:15:02 +0100
Message-Id: <20210401091502.15825-1-srinivas.kandagatla@linaro.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Looks like return from reg_write is set but not checked.
Fix this by adding error return path.

Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1503591 ("UNUSED_VALUE")
Fixes: 128eaf937adb ("soundwire: qcom: add support to missing transport params")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
 drivers/soundwire/qcom.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index 5fd4a99cc8ac..348d9a46f850 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -731,17 +731,23 @@ static int qcom_swrm_transport_params(struct sdw_bus *bus,
 	value |= pcfg->si;
 
 	ret = ctrl->reg_write(ctrl, reg, value);
+	if (ret)
+		goto err;
 
 	if (pcfg->lane_control != SWR_INVALID_PARAM) {
 		reg = SWRM_DP_PORT_CTRL_2_BANK(params->port_num, bank);
 		value = pcfg->lane_control;
 		ret = ctrl->reg_write(ctrl, reg, value);
+		if (ret)
+			goto err;
 	}
 
 	if (pcfg->blk_group_count != SWR_INVALID_PARAM) {
 		reg = SWRM_DP_BLOCK_CTRL2_BANK(params->port_num, bank);
 		value = pcfg->blk_group_count;
 		ret = ctrl->reg_write(ctrl, reg, value);
+		if (ret)
+			goto err;
 	}
 
 	if (pcfg->hstart != SWR_INVALID_PARAM
@@ -755,11 +761,15 @@ static int qcom_swrm_transport_params(struct sdw_bus *bus,
 		ret = ctrl->reg_write(ctrl, reg, value);
 	}
 
+	if (ret)
+		goto err;
+
 	if (pcfg->bp_mode != SWR_INVALID_PARAM) {
 		reg = SWRM_DP_BLOCK_CTRL3_BANK(params->port_num, bank);
 		ret = ctrl->reg_write(ctrl, reg, pcfg->bp_mode);
 	}
 
+err:
 	return ret;
 }
 
-- 
2.21.0