linux-kernel - [PATCH 08/14] staging: gasket: apex return error on sysfs show of missing attribute

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Message-Id: <20180721125713.88501-16-toddpoynor@gmail.com>
Date:   Sat, 21 Jul 2018 05:56:54 -0700
From:   Todd Poynor <toddpoynor@...il.com>
To:     Rob Springer <rspringer@...gle.com>,
        John Joseph <jnjoseph@...gle.com>,
        Ben Chan <benchan@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Zhongze Hu <frankhu@...omium.org>,
        Dmitry Torokhov <dtor@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Todd Poynor <toddpoynor@...gle.com>
Subject: [PATCH 08/14] staging: gasket: apex return error on sysfs show of missing attribute

From: Todd Poynor <toddpoynor@...gle.com>

Apex sysfs show function return -ENODEV if the attribute is not present,
rather than silently failing from the standpoint of the userspace
accessor.

Reported-by: Guenter Roeck <groeck@...omium.org>
Signed-off-by: Todd Poynor <toddpoynor@...gle.com>
---
 drivers/staging/gasket/apex_driver.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/gasket/apex_driver.c b/drivers/staging/gasket/apex_driver.c
index 3e76c4db5db2e..1c6f73b5a2a9e 100644
--- a/drivers/staging/gasket/apex_driver.c
+++ b/drivers/staging/gasket/apex_driver.c
@@ -710,14 +710,14 @@ static ssize_t sysfs_show(
 	gasket_dev = gasket_sysfs_get_device_data(device);
 	if (!gasket_dev) {
 		gasket_nodev_error("No Apex device sysfs mapping found");
-		return 0;
+		return -ENODEV;
 	}
 
 	gasket_attr = gasket_sysfs_get_attr(device, attr);
 	if (!gasket_attr) {
 		gasket_nodev_error("No Apex device sysfs attr data found");
 		gasket_sysfs_put_device_data(device, gasket_dev);
-		return 0;
+		return -ENODEV;
 	}
 
 	type = (enum sysfs_attribute_type)gasket_sysfs_get_attr(device, attr);
-- 
2.18.0.233.g985f88cf7e-goog