[PATCH AUTOSEL 5.10 006/100] drm/ast: fix memory leak when unload the driver

Sasha Levin
2021-05-03T16:46:44Z

From: Tong Zhang <ztong0001@gmail.com>

[ Upstream commit dc739820ff90acccd013f6bb420222978a982791 ]

a connector is leaked upon module unload, it seems that we should do
similar to sample driver as suggested in drm_drv.c.

Adding drm_atomic_helper_shutdown() in ast_pci_remove to prevent leaking.

[ 153.822134] WARNING: CPU: 0 PID: 173 at drivers/gpu/drm/drm_mode_config.c:504 drm_mode_config_cle0
[ 153.822698] Modules linked in: ast(-) drm_vram_helper drm_ttm_helper ttm [last unloaded: ttm]
[ 153.823197] CPU: 0 PID: 173 Comm: modprobe Tainted: G W 5.11.0-03615-g55f62bc873474
[ 153.823708] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-48-gd9c812dda519-4
[ 153.824333] RIP: 0010:drm_mode_config_cleanup+0x418/0x470
[ 153.824637] Code: 0c 00 00 00 00 48 8b 84 24 a8 00 00 00 65 48 33 04 25 28 00 00 00 75 65 48 81 c0
[ 153.825668] RSP: 0018:ffff888103c9fb70 EFLAGS: 00010212
[ 153.825962] RAX: ffff888102b0d100 RBX: ffff888102b0c298 RCX: ffffffff818d8b2b
[ 153.826356] RDX: dffffc0000000000 RSI: 000000007fffffff RDI: ffff888102b0c298
[ 153.826748] RBP: ffff888103c9fba0 R08: 0000000000000001 R09: ffffed1020561857
[ 153.827146] R10: ffff888102b0c2b7 R11: ffffed1020561856 R12: ffff888102b0c000
[ 153.827538] R13: ffff888102b0c2d8 R14: ffff888102b0c2d8 R15: 1ffff11020793f70
[ 153.827935] FS: 00007f24bff456a0(0000) GS:ffff88815b400000(0000) knlGS:0000000000000000
[ 153.828380] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 153.828697] CR2: 0000000001c39018 CR3: 0000000103c90000 CR4: 00000000000006f0
[ 153.829096] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 153.829486] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 153.829883] Call Trace:
[ 153.830024] ? drmm_mode_config_init+0x930/0x930
[ 153.830281] ? cpumask_next+0x16/0x20
[ 153.830488] ? mnt_get_count+0x66/0x80
[ 153.830699] ? drm_mode_config_cleanup+0x470/0x470
[ 153.830972] drm_managed_release+0xed/0x1c0
[ 153.831208] drm_dev_release+0x3a/0x50
[ 153.831420] release_nodes+0x39e/0x410
[ 153.831631] ? devres_release+0x40/0x40
[ 153.831852] device_release_driver_internal+0x158/0x270
[ 153.832143] driver_detach+0x76/0xe0
[ 153.832344] bus_remove_driver+0x7e/0x100
[ 153.832568] pci_unregister_driver+0x28/0xf0
[ 153.832821] __x64_sys_delete_module+0x268/0x300
[ 153.833086] ? __ia32_sys_delete_module+0x300/0x300
[ 153.833357] ? call_rcu+0x372/0x4f0
[ 153.833553] ? fpregs_assert_state_consistent+0x4d/0x60
[ 153.833840] ? exit_to_user_mode_prepare+0x2f/0x130
[ 153.834118] do_syscall_64+0x33/0x40
[ 153.834317] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 153.834597] RIP: 0033:0x7f24bfec7cf7
[ 153.834797] Code: 48 89 57 30 48 8b 04 24 48 89 47 38 e9 1d a0 02 00 48 89 f8 48 89 f7 48 89 d6 41
[ 153.835812] RSP: 002b:00007fff72e6cb58 EFLAGS: 00000202 ORIG_RAX: 00000000000000b0
[ 153.836234] RAX: ffffffffffffffda RBX: 00007f24bff45690 RCX: 00007f24bfec7cf7
[ 153.836623] RDX: 00000000ffffffff RSI: 0000000000000080 RDI: 0000000001c2fb10
[ 153.837018] RBP: 0000000001c2fac0 R08: 2f2f2f2f2f2f2f2f R09: 0000000001c2fac0
[ 153.837408] R10: fefefefefefefeff R11: 0000000000000202 R12: 0000000001c2fac0
[ 153.837798] R13: 0000000001c2f9d0 R14: 0000000000000000 R15: 0000000000000001
[ 153.838194] ---[ end trace b92031513bbe596c ]---
[ 153.838441] [drm:drm_mode_config_cleanup] *ERROR* connector VGA-1 leaked!

Signed-off-by: Tong Zhang <ztong0001@gmail.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20210222023322.984885-1-ztong0001@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/ast/ast_drv.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/ast/ast_drv.c b/drivers/gpu/drm/ast/ast_drv.c
index f0b4af1c390a..59d2466d40c6 100644
--- a/drivers/gpu/drm/ast/ast_drv.c
+++ b/drivers/gpu/drm/ast/ast_drv.c
@@ -30,6 +30,7 @@
#include <linux/module.h>
#include <linux/pci.h>

+#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fb_helper.h>
@@ -138,6 +139,7 @@ static void ast_pci_remove(struct pci_dev *pdev)
struct drm_device *dev = pci_get_drvdata(pdev);

drm_dev_unregister(dev);
+ drm_atomic_helper_shutdown(dev);
}

static int ast_drm_freeze(struct drm_device *dev)
--
2.30.2