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From: Stefan Achatz <>
To: Randy Dunlap <>,
	Jiri Kosina <>,
	Stefan Achatz <>,,,
Subject: [PATCH 2/2] HID: roccat: Fix an error message when reading more data from bin attributes
Date: Thu, 06 Jan 2011 09:00:41 +0100
Message-ID: <1294300841.5622.59.camel@neuromancer> (raw)

Using cat or something to read from binary attributes would try to do an
additional read with offset equal to filesize. This resulted in an invalid
attribute error. This is fixed by giving the right answer instead of EINVAL.

Signed-off-by: Stefan Achatz <>
 drivers/hid/hid-roccat-koneplus.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/hid/hid-roccat-koneplus.c b/drivers/hid/hid-roccat-koneplus.c
index 1608c8d..2df87bb 100644
--- a/drivers/hid/hid-roccat-koneplus.c
+++ b/drivers/hid/hid-roccat-koneplus.c
@@ -256,6 +256,9 @@ static ssize_t koneplus_sysfs_read(struct file *fp, struct kobject *kobj,
 	struct usb_device *usb_dev = interface_to_usbdev(to_usb_interface(dev));
 	int retval;
+	if (off >= real_size)
+		return 0;
 	if (off != 0 || count != real_size)
 		return -EINVAL;

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