linux-kernel - [PATCH 6.6.y] scsi: ufs: qcom: Only free platform MSIs when ESI is enabled

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Message-ID: <20250327091026.1239657-1-jianqi.ren.cn@windriver.com>
Date: Thu, 27 Mar 2025 17:10:26 +0800
From: <jianqi.ren.cn@...driver.com>
To: <stable@...r.kernel.org>
CC: <patches@...ts.linux.dev>, <gregkh@...uxfoundation.org>,
        <linux-kernel@...r.kernel.org>, <jianqi.ren.cn@...driver.com>,
        <mani@...nel.org>, <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <bvanassche@....org>,
        <quic_asutoshd@...cinc.com>, <quic_cang@...cinc.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
        <manivannan.sadhasivam@...aro.org>, <beanhuo@...ron.com>
Subject: [PATCH 6.6.y] scsi: ufs: qcom: Only free platform MSIs when ESI is enabled

From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

commit 64506b3d23a337e98a74b18dcb10c8619365f2bd upstream.

Otherwise, it will result in a NULL pointer dereference as below:

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000008
Call trace:
 mutex_lock+0xc/0x54
 platform_device_msi_free_irqs_all+0x14/0x20
 ufs_qcom_remove+0x34/0x48 [ufs_qcom]
 platform_remove+0x28/0x44
 device_remove+0x4c/0x80
 device_release_driver_internal+0xd8/0x178
 driver_detach+0x50/0x9c
 bus_remove_driver+0x6c/0xbc
 driver_unregister+0x30/0x60
 platform_driver_unregister+0x14/0x20
 ufs_qcom_pltform_exit+0x18/0xb94 [ufs_qcom]
 __arm64_sys_delete_module+0x180/0x260
 invoke_syscall+0x44/0x100
 el0_svc_common.constprop.0+0xc0/0xe0
 do_el0_svc+0x1c/0x28
 el0_svc+0x34/0xdc
 el0t_64_sync_handler+0xc0/0xc4
 el0t_64_sync+0x190/0x194

Cc: stable@...r.kernel.org # 6.3
Fixes: 519b6274a777 ("scsi: ufs: qcom: Add MCQ ESI config vendor specific ops")
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Link: https://lore.kernel.org/r/20241111-ufs_bug_fix-v1-2-45ad8b62f02e@linaro.org
Reviewed-by: Bean Huo <beanhuo@...ron.com>
Reviewed-by: Bart Van Assche <bvanassche@....org>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Jianqi Ren <jianqi.ren.cn@...driver.com>
Signed-off-by: He Zhe <zhe.he@...driver.com>
---
Verified the build test
---
 drivers/ufs/host/ufs-qcom.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/ufs/host/ufs-qcom.c b/drivers/ufs/host/ufs-qcom.c
index c5a6b133d364..51ed40529f9a 100644
--- a/drivers/ufs/host/ufs-qcom.c
+++ b/drivers/ufs/host/ufs-qcom.c
@@ -1918,10 +1918,12 @@ static int ufs_qcom_probe(struct platform_device *pdev)
 static int ufs_qcom_remove(struct platform_device *pdev)
 {
 	struct ufs_hba *hba =  platform_get_drvdata(pdev);
+	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
 
 	pm_runtime_get_sync(&(pdev)->dev);
 	ufshcd_remove(hba);
-	platform_msi_domain_free_irqs(hba->dev);
+	if (host->esi_enabled)
+		platform_msi_domain_free_irqs(hba->dev);
 	return 0;
 }
 
-- 
2.25.1