diff options
| author | Tong Zhang <ztong0001@gmail.com> | 2021-02-27 23:46:25 -0500 |
|---|---|---|
| committer | Maarten Lankhorst <maarten.lankhorst@linux.intel.com> | 2021-03-11 11:08:14 +0100 |
| commit | 874a52f9b693ed8bf7a92b3592a547ce8a684e6f (patch) | |
| tree | 4fec122eafb432e7fb0a2618317866e05c16add4 /drivers/gpu/drm/drm_fb_helper.c | |
| parent | a38fd8748464831584a19438cbb3082b5a2dab15 (diff) | |
drm/fb-helper: only unmap if buffer not null
drm_fbdev_cleanup() can be called when fb_helper->buffer is null, hence
fb_helper->buffer should be checked before calling
drm_client_buffer_vunmap(). This buffer is also checked in
drm_client_framebuffer_delete(), so we should also do the same thing for
drm_client_buffer_vunmap().
[ 199.128742] RIP: 0010:drm_client_buffer_vunmap+0xd/0x20
[ 199.129031] Code: 43 18 48 8b 53 20 49 89 45 00 49 89 55 08 5b 44 89 e0 41 5c 41 5d 41 5e 5d
c3 0f 1f 00 53 48 89 fb 48 8d 7f 10 e8 73 7d a1 ff <48> 8b 7b 10 48 8d 73 18 5b e9 75 53 fc ff 0
f 1f 44 00 00 48 b8 00
[ 199.130041] RSP: 0018:ffff888103f3fc88 EFLAGS: 00010282
[ 199.130329] RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff8214d46d
[ 199.130733] RDX: 1ffffffff079c6b9 RSI: 0000000000000246 RDI: ffffffff83ce35c8
[ 199.131119] RBP: ffff888103d25458 R08: 0000000000000001 R09: fffffbfff0791761
[ 199.131505] R10: ffffffff83c8bb07 R11: fffffbfff0791760 R12: 0000000000000000
[ 199.131891] R13: ffff888103d25468 R14: ffff888103d25418 R15: ffff888103f18120
[ 199.132277] FS: 00007f36fdcbb6a0(0000) GS:ffff88815b400000(0000) knlGS:0000000000000000
[ 199.132721] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 199.133033] CR2: 0000000000000010 CR3: 0000000103d26000 CR4: 00000000000006f0
[ 199.133420] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 199.133807] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 199.134195] Call Trace:
[ 199.134333] drm_fbdev_cleanup+0x179/0x1a0
[ 199.134562] drm_fbdev_client_unregister+0x2b/0x40
[ 199.134828] drm_client_dev_unregister+0xa8/0x180
[ 199.135088] drm_dev_unregister+0x61/0x110
[ 199.135315] mgag200_pci_remove+0x38/0x52 [mgag200]
[ 199.135586] pci_device_remove+0x62/0xe0
[ 199.135806] device_release_driver_internal+0x148/0x270
[ 199.136094] driver_detach+0x76/0xe0
[ 199.136294] bus_remove_driver+0x7e/0x100
[ 199.136521] pci_unregister_driver+0x28/0xf0
[ 199.136759] __x64_sys_delete_module+0x268/0x300
[ 199.137016] ? __ia32_sys_delete_module+0x300/0x300
[ 199.137285] ? call_rcu+0x3e4/0x580
[ 199.137481] ? fpregs_assert_state_consistent+0x4d/0x60
[ 199.137767] ? exit_to_user_mode_prepare+0x2f/0x130
[ 199.138037] do_syscall_64+0x33/0x40
[ 199.138237] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 199.138517] RIP: 0033:0x7f36fdc3dcf7
Signed-off-by: Tong Zhang <ztong0001@gmail.com>
Fixes: 763aea17bf57 ("drm/fb-helper: Unmap client buffer during shutdown")
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v5.11+
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20210228044625.171151-1-ztong0001@gmail.com
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Diffstat (limited to 'drivers/gpu/drm/drm_fb_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_fb_helper.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index b9a616737c0e..f6baa2046124 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -2048,7 +2048,7 @@ static void drm_fbdev_cleanup(struct drm_fb_helper *fb_helper) if (shadow) vfree(shadow); - else + else if (fb_helper->buffer) drm_client_buffer_vunmap(fb_helper->buffer); drm_client_framebuffer_delete(fb_helper->buffer); |