linux-kernel - [PATCH 5/5] staging: gasket: core: hold reference on device kobj while in use

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Message-Id: <20180728052200.228796-6-toddpoynor@gmail.com>
Date:   Fri, 27 Jul 2018 22:22:00 -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:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Todd Poynor <toddpoynor@...gle.com>
Subject: [PATCH 5/5] staging: gasket: core: hold reference on device kobj while in use

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

Hold a reference on the struct device kobject while a pointer to that
device is in use by gasket.

Reported-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Todd Poynor <toddpoynor@...gle.com>
---
 drivers/staging/gasket/gasket_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/gasket/gasket_core.c b/drivers/staging/gasket/gasket_core.c
index 859a6df9e12df..1dc7273e38734 100644
--- a/drivers/staging/gasket/gasket_core.c
+++ b/drivers/staging/gasket/gasket_core.c
@@ -449,6 +449,7 @@ static int gasket_alloc_dev(
 	gasket_dev->dev_idx = dev_idx;
 	snprintf(gasket_dev->kobj_name, GASKET_NAME_MAX, "%s", kobj_name);
 	gasket_dev->dev = parent;
+	kobject_get(&gasket_dev->dev->kobj);
 	/* gasket_bar_data is uninitialized. */
 	gasket_dev->num_page_tables = driver_desc->num_page_tables;
 	/* max_page_table_size and *page table are uninit'ed */
@@ -487,7 +488,7 @@ static void gasket_free_dev(struct gasket_dev *gasket_dev)
 	mutex_lock(&internal_desc->mutex);
 	internal_desc->devs[gasket_dev->dev_idx] = NULL;
 	mutex_unlock(&internal_desc->mutex);
-
+	kobject_put(&gasket_dev->dev->kobj);
 	kfree(gasket_dev);
 }
 
-- 
2.18.0.345.g5c9ce644c3-goog