linux-kernel - [PATCH 2/2] char: pcmcia: cm4040_cs: Fix failure handling Handled failure cases of device

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Date:   Mon, 24 May 2021 01:00:29 +0530
From:   nizamhaider786@...il.com
To:     laforge@...monks.org
Cc:     arnd@...db.de, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org,
        Nijam Haider <nizamhaider786@...il.com>
Subject: [PATCH 2/2] char: pcmcia: cm4040_cs: Fix failure handling Handled failure cases of device_create()

From: Nijam Haider <nizamhaider786@...il.com>

Signed-off-by: Nijam Haider <nizamhaider786@...il.com>
---
 drivers/char/pcmcia/cm4040_cs.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/char/pcmcia/cm4040_cs.c b/drivers/char/pcmcia/cm4040_cs.c
index d5e4360..30bb977 100644
--- a/drivers/char/pcmcia/cm4040_cs.c
+++ b/drivers/char/pcmcia/cm4040_cs.c
@@ -558,6 +558,7 @@ static void reader_release(struct pcmcia_device *link)
 static int reader_probe(struct pcmcia_device *link)
 {
 	struct reader_dev *dev;
+	struct device *dev_ret;
 	int i, ret;
 
 	for (i = 0; i < CM_MAX_DEV; i++) {
@@ -593,8 +594,15 @@ static int reader_probe(struct pcmcia_device *link)
 		return ret;
 	}
 
-	device_create(cmx_class, NULL, MKDEV(major, i), NULL, "cmx%d", i);
-
+	dev_ret = device_create(cmx_class, NULL, MKDEV(major, i), NULL, "cmx%d", i);
+        if (IS_ERR(dev_ret)) {
+                printk(KERN_ERR "device_create failed for %d\n",
+                               i);
+                reader_release(link);
+                dev_table[i] = NULL;
+                kfree(dev);
+                return -ENODEV;
+        }
 	return 0;
 }
 
-- 
2.7.4