linux-kernel - [PATCH 04/18] staging: gasket: device registration error and unregister fixups

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Date:   Fri, 13 Jul 2018 22:58:02 -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 04/18] staging: gasket: device registration error and unregister fixups

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

Remove device registration on class creation fail.

Hold mutex around device removal updates for proper ordering of
updates.

Signed-off-by: Zhongze Hu <frankhu@...omium.org>
Signed-off-by: Todd Poynor <toddpoynor@...gle.com>
---
 drivers/staging/gasket/gasket_core.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/gasket/gasket_core.c b/drivers/staging/gasket/gasket_core.c
index 45914ebc8f44..3bdf7d36b397 100644
--- a/drivers/staging/gasket/gasket_core.c
+++ b/drivers/staging/gasket/gasket_core.c
@@ -342,7 +342,8 @@ int gasket_register_device(const struct gasket_driver_desc *driver_desc)
 	if (IS_ERR_OR_NULL(internal->class)) {
 		gasket_nodev_error("Cannot register %s class [ret=%ld]",
 				   driver_desc->name, PTR_ERR(internal->class));
-		return PTR_ERR(internal->class);
+		ret = PTR_ERR(internal->class);
+		goto fail0;
 	}
 
 	/*
@@ -376,7 +377,10 @@ int gasket_register_device(const struct gasket_driver_desc *driver_desc)
 fail1:
 	class_destroy(internal->class);
 
+fail0:
+	mutex_lock(&g_mutex);
 	g_descs[desc_idx].driver_desc = NULL;
+	mutex_unlock(&g_mutex);
 	return ret;
 }
 EXPORT_SYMBOL(gasket_register_device);
@@ -413,7 +417,9 @@ 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