linux-kernel - [PATCH 4/5] usb-misc: sisusbvga: Remove kmalloc logs and fix error path

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Date:	Tue,  5 Jan 2016 17:54:09 +0100
From:	Peter Senna Tschudin <peter.senna@...labora.com>
To:	thomas@...ischhofer.net, gregkh@...uxfoundation.org,
	trivial@...nel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	Peter Senna Tschudin <peter.senna@...il.com>,
	Peter Senna Tschudin <peter.senna@...labora.com>
Subject: [PATCH 4/5] usb-misc: sisusbvga: Remove kmalloc logs and fix error path

From: Peter Senna Tschudin <peter.senna@...il.com>

This patch remove four calls to dev_err() from sisusb_probe() as
reporting memory allocation failures is redundant:

 - Remove a call to dev_err() that was reporting unsuccesful call to
   kzalloc().

 - Remove two calls to dev_err() that were reporting unsuccesful calls
   to kmalloc().

 - Remove a call to dev_err() that was reporting unsuccesful call to
   kmalloc(), and replace it by code that clean up previously allocated
   resources and abort the probe with -ENOMEM. Before this modification
   sisusb->SiS_Pr could be dereferenced even it was null.

Signed-off-by: Peter Senna Tschudin <peter.senna@...labora.com>
---
Tested by compilation only.

 drivers/usb/misc/sisusbvga/sisusb.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/misc/sisusbvga/sisusb.c b/drivers/usb/misc/sisusbvga/sisusb.c
index 6cce4fb..875e365 100644
--- a/drivers/usb/misc/sisusbvga/sisusb.c
+++ b/drivers/usb/misc/sisusbvga/sisusb.c
@@ -3040,10 +3040,9 @@ static int sisusb_probe(struct usb_interface *intf,
 
 	/* Allocate memory for our private */
 	sisusb = kzalloc(sizeof(*sisusb), GFP_KERNEL);
-	if (!sisusb) {
-		dev_err(&dev->dev, "Failed to allocate memory for private data\n");
+	if (!sisusb)
 		return -ENOMEM;
-	}
+
 	kref_init(&sisusb->kref);
 
 	mutex_init(&(sisusb->lock));
@@ -3070,7 +3069,6 @@ static int sisusb_probe(struct usb_interface *intf,
 	sisusb->ibufsize = SISUSB_IBUF_SIZE;
 	sisusb->ibuf = kmalloc(SISUSB_IBUF_SIZE, GFP_KERNEL);
 	if (!sisusb->ibuf) {
-		dev_err(&sisusb->sisusb_dev->dev, "Failed to allocate memory for input buffer");
 		retval = -ENOMEM;
 		goto error_2;
 	}
@@ -3081,7 +3079,6 @@ static int sisusb_probe(struct usb_interface *intf,
 		sisusb->obuf[i] = kmalloc(SISUSB_OBUF_SIZE, GFP_KERNEL);
 		if (!sisusb->obuf[i]) {
 			if (i == 0) {
-				dev_err(&sisusb->sisusb_dev->dev, "Failed to allocate memory for output buffer\n");
 				retval = -ENOMEM;
 				goto error_3;
 			}
@@ -3119,7 +3116,8 @@ static int sisusb_probe(struct usb_interface *intf,
 	/* Allocate our SiS_Pr */
 	sisusb->SiS_Pr = kmalloc(sizeof(struct SiS_Private), GFP_KERNEL);
 	if (!sisusb->SiS_Pr) {
-		dev_err(&sisusb->sisusb_dev->dev, "Failed to allocate SiS_Pr\n");
+		retval = -ENOMEM;
+		goto error_4;
 	}
 #endif
 
-- 
2.5.0

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