• Ping-Ke Shih's avatar
    rtlwifi: Fix kernel Oops "Fw download fail!!" · 12dfa2f6
    Ping-Ke Shih authored
    When connecting to AP, mac80211 asks driver to enter and leave PS quickly,
    but driver deinit doesn't wait for delayed work complete when entering PS,
    then driver reinit procedure and delay work are running simultaneously.
    This will cause unpredictable kernel oops or crash like
    
    rtl8723be: error H2C cmd because of Fw download fail!!!
    WARNING: CPU: 3 PID: 159 at drivers/net/wireless/realtek/rtlwifi/
    	 rtl8723be/fw.c:227 rtl8723be_fill_h2c_cmd+0x182/0x510 [rtl8723be]
    CPU: 3 PID: 159 Comm: kworker/3:2 Tainted: G       O     4.16.13-2-ARCH #1
    Hardware name: ASUSTeK COMPUTER INC. X556UF/X556UF, BIOS X556UF.406
    	       10/21/2016
    Workqueue: rtl8723be_pci rtl_c2hcmd_wq_callback [rtlwifi]
    RIP: 0010:rtl8723be_fill_h2c_cmd+0x182/0x510 [rtl8723be]
    RSP: 0018:ffffa6ab01e1bd70 EFLAGS: 00010282
    RAX: 0000000000000000 RBX: ffffa26069071520 RCX: 0000000000000001
    RDX: 0000000080000001 RSI: ffffffff8be70e9c RDI: 00000000ffffffff
    RBP: 0000000000000000 R08: 0000000000000048 R09: 0000000000000348
    R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
    R13: ffffa26069071520 R14: 0000000000000000 R15: ffffa2607d205f70
    FS:  0000000000000000(0000) GS:ffffa26081d80000(0000) knlGS:000000000000000
    CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 00000443b39d3000 CR3: 000000037700a005 CR4: 00000000003606e0
    Call Trace:
     ? halbtc_send_bt_mp_operation.constprop.17+0xd5/0xe0 [btcoexist]
     ? ex_btc8723b1ant_bt_info_notify+0x3b8/0x820 [btcoexist]
     ? rtl_c2hcmd_launcher+0xab/0x110 [rtlwifi]
     ? process_one_work+0x1d1/0x3b0
     ? worker_thread+0x2b/0x3d0
     ? process_one_work+0x3b0/0x3b0
     ? kthread+0x112/0x130
     ? kthread_create_on_node+0x60/0x60
     ? ret_from_fork+0x35/0x40
    Code: 00 76 b4 e9 e2 fe ff ff 4c 89 ee 4c 89 e7 e8 56 22 86 ca e9 5e ...
    
    This patch ensures all delayed works done before entering PS to satisfy
    our expectation, so use cancel_delayed_work_sync() instead. An exception
    is delayed work ips_nic_off_wq because running task may be itself, so add
    a parameter ips_wq to deinit function to handle this case.
    
    This issue is reported and fixed in below threads:
    https://github.com/lwfinger/rtlwifi_new/issues/367
    https://github.com/lwfinger/rtlwifi_new/issues/366
    
    Tested-by: Evgeny Kapun <abacabadabacaba@gmail.com> # 8723DE
    Tested-by: Shivam Kakkar <shivam543@gmail.com> # 8723BE on 4.18-rc1
    Signed-off-by: default avatarPing-Ke Shih <pkshih@realtek.com>
    Fixes: cceb0a59 ("rtlwifi: Add work queue for c2h cmd.")
    Cc: Stable <stable@vger.kernel.org> # 4.11+
    Reviewed-by: default avatarLarry Finger <Larry.Finger@lwfinger.net>
    Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
    12dfa2f6
pci.c 67.3 KB