linux-kernel - [PATCH 4.17 06/67] drm/etnaviv: Fix driver unregistering

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Date:   Mon, 16 Jul 2018 09:34:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Russell King <linux@...linux.org.uk>,
        Fabio Estevam <fabio.estevam@....com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Lucas Stach <l.stach@...gutronix.de>
Subject: [PATCH 4.17 06/67] drm/etnaviv: Fix driver unregistering

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Fabio Estevam <fabio.estevam@....com>

commit bf6ba3aeb2962e5ee4a78e7535af579ecba630bb upstream.

Russell King reported:

"When removing and reloading the etnaviv module, the following splat
occurs:

sysfs: cannot create duplicate filename '/devices/platform/etnaviv'
CPU: 0 PID: 1471 Comm: modprobe Not tainted 4.17.0+ #1608
Hardware name: Marvell Dove (Cubox)
Backtrace:
[<c00157d4>] (dump_backtrace) from [<c0015b8c>] (show_stack+0x18/0x1c)
 r6:ef033e38 r5:ee07b340 r4:edb9d000 r3:00000000
[<c0015b74>] (show_stack) from [<c0620784>] (dump_stack+0x20/0x28)
[<c0620764>] (dump_stack) from [<c01bcd24>] (sysfs_warn_dup+0x5c/0x70)
[<c01bccc8>] (sysfs_warn_dup) from [<c01bce14>] (sysfs_create_dir_ns+0x90/0x98)
..."

Commit 246774d17fc0 ("drm/etnaviv: remove the need for a gpu-subsystem
DT node") introduced DRM registration via
platform_device_register_simple(), but missed to call
platform_device_unregister() inside etnaviv_exit().

Fix the problem by calling platform_device_unregister() inside
etnaviv_exit(). While at it, also rearrange the function calls
in the exit path to make them happen in the opposite order of
registration.

Tested on a imx6-sabresd board.

Cc: <stable@...r.kernel.org>
Fixes: 246774d17fc0 ("drm/etnaviv: remove the need for a gpu-subsystem DT node")
Reported-by: Russell King <linux@...linux.org.uk>
Signed-off-by: Fabio Estevam <fabio.estevam@....com>
Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>
Signed-off-by: Lucas Stach <l.stach@...gutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/etnaviv/etnaviv_drv.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/etnaviv/etnaviv_drv.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_drv.c
@@ -742,8 +742,9 @@ module_init(etnaviv_init);
 
 static void __exit etnaviv_exit(void)
 {
-	platform_driver_unregister(&etnaviv_gpu_driver);
+	platform_device_unregister(etnaviv_drm);
 	platform_driver_unregister(&etnaviv_platform_driver);
+	platform_driver_unregister(&etnaviv_gpu_driver);
 }
 module_exit(etnaviv_exit);