linux-kernel - [PATCH 5.17 0704/1126] net: wwan: qcom_bam_dmux: fix wrong pointer passed to IS

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Date:   Tue,  5 Apr 2022 09:24:11 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yang Yingliang <yangyingliang@...wei.com>,
        Stephan Gerhold <stephan@...hold.net>,
        Paolo Abeni <pabeni@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 0704/1126] net: wwan: qcom_bam_dmux: fix wrong pointer passed to IS_ERR()

From: Yang Yingliang <yangyingliang@...wei.com>

[ Upstream commit 6b3c74550224c3be24c4cf6ab8c333602b458bff ]

It should check dmux->tx after calling dma_request_chan().

Fixes: 21a0ffd9b38c ("net: wwan: Add Qualcomm BAM-DMUX WWAN network driver")
Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
Reviewed-by: Stephan Gerhold <stephan@...hold.net>
Link: https://lore.kernel.org/r/20220319032450.3288224-1-yangyingliang@huawei.com
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wwan/qcom_bam_dmux.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wwan/qcom_bam_dmux.c b/drivers/net/wwan/qcom_bam_dmux.c
index 5dfa2eba6014..17d46f4d2913 100644
--- a/drivers/net/wwan/qcom_bam_dmux.c
+++ b/drivers/net/wwan/qcom_bam_dmux.c
@@ -755,7 +755,7 @@ static int __maybe_unused bam_dmux_runtime_resume(struct device *dev)
 		return 0;
 
 	dmux->tx = dma_request_chan(dev, "tx");
-	if (IS_ERR(dmux->rx)) {
+	if (IS_ERR(dmux->tx)) {
 		dev_err(dev, "Failed to request TX DMA channel: %pe\n", dmux->tx);
 		dmux->tx = NULL;
 		bam_dmux_runtime_suspend(dev);
-- 
2.34.1