diff options
| author | Deren Wu <deren.wu@mediatek.com> | 2022-09-06 15:39:43 +0300 |
|---|---|---|
| committer | Felix Fietkau <nbd@nbd.name> | 2022-09-15 14:15:49 +0300 |
| commit | cddc4b43ea9326eb3870104f851947e1d91cdd3b (patch) | |
| tree | 40e3941a279d544db69cd2ffb49159f8cba0c951 | |
| parent | 0c0bda4aea05493f04993f68d62bf7de937ace59 (diff) | |
wifi: mt76: mt7921e: fix rmmod crash in driver reload test
In insmod/rmmod stress test, the following crash dump shows up immediately.
The problem is caused by missing mt76_dev in mt7921_pci_remove(). We
should make sure the drvdata is ready before probe() finished.
[168.862789] ==================================================================
[168.862797] BUG: KASAN: user-memory-access in try_to_grab_pending+0x59/0x480
[168.862805] Write of size 8 at addr 0000000000006df0 by task rmmod/5361
[168.862812] CPU: 7 PID: 5361 Comm: rmmod Tainted: G OE 5.19.0-rc6 #1
[168.862816] Hardware name: Intel(R) Client Systems NUC8i7BEH/NUC8BEB, 05/04/2020
[168.862820] Call Trace:
[168.862822] <TASK>
[168.862825] dump_stack_lvl+0x49/0x63
[168.862832] print_report.cold+0x493/0x6b7
[168.862845] kasan_report+0xa7/0x120
[168.862857] kasan_check_range+0x163/0x200
[168.862861] __kasan_check_write+0x14/0x20
[168.862866] try_to_grab_pending+0x59/0x480
[168.862870] __cancel_work_timer+0xbb/0x340
[168.862898] cancel_work_sync+0x10/0x20
[168.862902] mt7921_pci_remove+0x61/0x1c0 [mt7921e]
[168.862909] pci_device_remove+0xa3/0x1d0
[168.862914] device_remove+0xc4/0x170
[168.862920] device_release_driver_internal+0x163/0x300
[168.862925] driver_detach+0xc7/0x1a0
[168.862930] bus_remove_driver+0xeb/0x2d0
[168.862935] driver_unregister+0x71/0xb0
[168.862939] pci_unregister_driver+0x30/0x230
[168.862944] mt7921_pci_driver_exit+0x10/0x1b [mt7921e]
[168.862949] __x64_sys_delete_module+0x2f9/0x4b0
[168.862968] do_syscall_64+0x38/0x90
[168.862973] entry_SYSCALL_64_after_hwframe+0x63/0xcd
Test steps:
1. insmode
2. do not ifup
3. rmmod quickly (within 1 second)
Fixes: 1c71e03afe4b ("mt76: mt7921: move mt7921_init_hw in a dedicated work")
Signed-off-by: Deren Wu <deren.wu@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
| -rw-r--r-- | mt7921/pci.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mt7921/pci.c b/mt7921/pci.c index 483e7243..b7ea6bf7 100644 --- a/mt7921/pci.c +++ b/mt7921/pci.c @@ -284,6 +284,8 @@ static int mt7921_pci_probe(struct pci_dev *pdev, goto err_free_pci_vec; } + pci_set_drvdata(pdev, mdev); + dev = container_of(mdev, struct mt7921_dev, mt76); dev->hif_ops = &mt7921_pcie_ops; |