linux-kernel - [PATCH v1] platform/x86/dell/dell-rbtn: Fix resources leaking on error path

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Message-Id: <20230612090250.1417940-1-michal.wilczynski@intel.com>
Date:   Mon, 12 Jun 2023 12:02:50 +0300
From:   Michal Wilczynski <michal.wilczynski@...el.com>
To:     linux-acpi@...r.kernel.org
Cc:     rafael@...nel.org, andriy.shevchenko@...el.com,
        ilpo.jarvinen@...ux.intel.com, pali@...nel.org,
        hdegoede@...hat.com, markgross@...nel.org, fengguang.wu@...el.com,
        dvhart@...ux.intel.com, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1] platform/x86/dell/dell-rbtn: Fix resources leaking on error path

Currently rbtn_add() in case of failure is leaking resources. Fix this
by adding a proper rollback. While at it, remove unnecessary assignment
of NULL to device->driver_data and unnecessary whitespace, plus add a
break for the default case in a switch.

Suggested-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Fixes: 817a5cdb40c8 ("dell-rbtn: Dell Airplane Mode Switch driver")
Signed-off-by: Michal Wilczynski <michal.wilczynski@...el.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/platform/x86/dell/dell-rbtn.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/dell/dell-rbtn.c b/drivers/platform/x86/dell/dell-rbtn.c
index aa0e6c907494..e9b3f9c3ab7d 100644
--- a/drivers/platform/x86/dell/dell-rbtn.c
+++ b/drivers/platform/x86/dell/dell-rbtn.c
@@ -420,10 +420,12 @@ static int rbtn_add(struct acpi_device *device)
 		break;
 	default:
 		ret = -EINVAL;
+		break;
 	}
+	if (ret)
+		rbtn_acquire(device, false);
 
 	return ret;
-
 }
 
 static void rbtn_remove(struct acpi_device *device)
@@ -442,7 +444,6 @@ static void rbtn_remove(struct acpi_device *device)
 	}
 
 	rbtn_acquire(device, false);
-	device->driver_data = NULL;
 }
 
 static void rbtn_notify(struct acpi_device *device, u32 event)
-- 
2.40.1