linux-kernel - [PATCH] staging: Comedi: comedi_fops: Fixed the return error code

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Message-Id: <1435570877-27882-1-git-send-email-abbotti@mev.co.uk>
Date:	Mon, 29 Jun 2015 10:41:17 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	Santhosh Pai <santhosh.pai88@...oo.com>, sudipm.mukherjee@...il.com
Cc:	hsweeten@...ionengravers.com, <abbotti@....co.uk>,
	devel@...verdev.osuosl.org, gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] staging: Comedi: comedi_fops: Fixed the return error code

From: Santhosh Pai <santhosh.pai88@...oo.com>

From: Santhosh Pai <santhosh.pai88@...oo.com>

This patch fixes the checkpatch.pl warning:

WARNING: ENOSYS means 'invalid syscall nr' and nothing else

try_module_get fails when the reference count of the module is not
allowed to be incremented ,and hence -ENXIO is returned indicating
no device or address.

[IA - combined two of santhosh's changes to the error return value!]

Signed-off-by: santhosh pai <santhosh.pai88@...oo.com>
Reviewed-by: Ian Abbott <abbotti@....co.uk>
---
 drivers/staging/comedi/comedi_fops.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 985d94b..1ab443c 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -2606,7 +2606,7 @@ static int comedi_open(struct inode *inode, struct file *file)
 	}
 	if (dev->attached && dev->use_count == 0) {
 		if (!try_module_get(dev->driver->module)) {
-			rc = -ENOSYS;
+			rc = -ENXIO;
 			goto out;
 		}
 		if (dev->open) {
-- 
2.1.4

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