linux-kernel - [PATCH 06/32] staging: gasket: hold mutex on gasket driver unregistration

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Date:   Mon, 16 Jul 2018 19:09:00 -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:     Zhongze Hu <frankhu@...omium.org>, Simon Que <sque@...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 06/32] staging: gasket: hold mutex on gasket driver unregistration

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

Take the global mutex on driver unregistration updates for proper
ordering of updates and consistent access procedures.

Signed-off-by: Zhongze Hu <frankhu@...omium.org>
Signed-off-by: Todd Poynor <toddpoynor@...gle.com>
---
 drivers/staging/gasket/gasket_core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/staging/gasket/gasket_core.c b/drivers/staging/gasket/gasket_core.c
index cbadab7544c81..2ff328652356a 100644
--- a/drivers/staging/gasket/gasket_core.c
+++ b/drivers/staging/gasket/gasket_core.c
@@ -371,7 +371,9 @@ int gasket_register_device(const struct gasket_driver_desc *driver_desc)
 	class_destroy(internal->class);
 
 unregister_gasket_driver:
+	mutex_lock(&g_mutex);
 	g_descs[desc_idx].driver_desc = NULL;
+	mutex_unlock(&g_mutex);
 	return ret;
 }
 EXPORT_SYMBOL(gasket_register_device);
@@ -408,7 +410,9 @@ void gasket_unregister_device(const struct gasket_driver_desc *driver_desc)
 	class_destroy(internal_desc->class);
 
 	/* Finally, effectively "remove" the driver. */
+	mutex_lock(&g_mutex);
 	g_descs[desc_idx].driver_desc = NULL;
+	mutex_unlock(&g_mutex);
 
 	gasket_nodev_info("removed %s driver", driver_desc->name);
 }
-- 
2.18.0.203.gfac676dfb9-goog