linux-kernel - [PATCH v3 3/4] coresight: ultrasoc-smb: Fix uninitialized before use buf_hw

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Message-ID: <20231114133346.30489-4-hejunhao3@huawei.com>
Date:   Tue, 14 Nov 2023 21:33:45 +0800
From:   Junhao He <hejunhao3@...wei.com>
To:     <suzuki.poulose@....com>, <james.clark@....com>
CC:     <coresight@...ts.linaro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>,
        <jonathan.cameron@...wei.com>, <yangyicong@...wei.com>,
        <prime.zeng@...ilicon.com>, <hejunhao3@...wei.com>,
        <u.kleine-koenig@...gutronix.de>
Subject: [PATCH v3 3/4] coresight: ultrasoc-smb: Fix uninitialized before use buf_hw_base

In smb_reset_buffer, the sdb->buf_hw_base variable is uninitialized
before use, which initializes it in smb_init_data_buffer. And the SMB
regiester are set in smb_config_inport.
So move the call after smb_config_inport.

Fixes: 06f5c2926aaa ("drivers/coresight: Add UltraSoc System Memory Buffer driver")
Signed-off-by: Junhao He <hejunhao3@...wei.com>
---
 drivers/hwtracing/coresight/ultrasoc-smb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/ultrasoc-smb.c b/drivers/hwtracing/coresight/ultrasoc-smb.c
index 2f2aba90a514..6e32d31a95fe 100644
--- a/drivers/hwtracing/coresight/ultrasoc-smb.c
+++ b/drivers/hwtracing/coresight/ultrasoc-smb.c
@@ -477,7 +477,6 @@ static int smb_init_data_buffer(struct platform_device *pdev,
 static void smb_init_hw(struct smb_drv_data *drvdata)
 {
 	smb_disable_hw(drvdata);
-	smb_reset_buffer(drvdata);
 
 	writel(SMB_LB_CFG_LO_DEFAULT, drvdata->base + SMB_LB_CFG_LO_REG);
 	writel(SMB_LB_CFG_HI_DEFAULT, drvdata->base + SMB_LB_CFG_HI_REG);
@@ -587,6 +586,7 @@ static int smb_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	smb_reset_buffer(drvdata);
 	platform_set_drvdata(pdev, drvdata);
 	spin_lock_init(&drvdata->spinlock);
 	drvdata->pid = -1;
-- 
2.33.0