linux-kernel - [PATCH v4 net-next 1/1] wwan: core: Unshadow error code returned by ida_alloc

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Message-Id: <20210811133932.14334-1-andriy.shevchenko@linux.intel.com>
Date:   Wed, 11 Aug 2021 16:39:32 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Sergey Ryazanov <ryazanov.s.a@...il.com>,
        Loic Poulain <loic.poulain@...aro.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Johannes Berg <johannes@...solutions.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v4 net-next 1/1] wwan: core: Unshadow error code returned by ida_alloc_range()

ida_alloc_range() may return other than -ENOMEM error code.
Unshadow it in the wwan_create_port().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Reviewed-by: Sergey Ryazanov <ryazanov.s.a@...il.com>
Reviewed-by: Loic Poulain <loic.poulain@...aro.org>
---
v4: actually fixed typo in the subject (Sergey)

 drivers/net/wwan/wwan_core.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wwan/wwan_core.c b/drivers/net/wwan/wwan_core.c
index 35ece98134c0..d293ab688044 100644
--- a/drivers/net/wwan/wwan_core.c
+++ b/drivers/net/wwan/wwan_core.c
@@ -359,8 +359,8 @@ struct wwan_port *wwan_create_port(struct device *parent,
 {
 	struct wwan_device *wwandev;
 	struct wwan_port *port;
-	int minor, err = -ENOMEM;
 	char namefmt[0x20];
+	int minor, err;
 
 	if (type > WWAN_PORT_MAX || !ops)
 		return ERR_PTR(-EINVAL);
@@ -374,11 +374,14 @@ struct wwan_port *wwan_create_port(struct device *parent,
 
 	/* A port is exposed as character device, get a minor */
 	minor = ida_alloc_range(&minors, 0, WWAN_MAX_MINORS - 1, GFP_KERNEL);
-	if (minor < 0)
+	if (minor < 0) {
+		err = minor;
 		goto error_wwandev_remove;
+	}
 
 	port = kzalloc(sizeof(*port), GFP_KERNEL);
 	if (!port) {
+		err = -ENOMEM;
 		ida_free(&minors, minor);
 		goto error_wwandev_remove;
 	}
-- 
2.30.2