Piotr Figiel <p.figiel@xxxxxxxxxxxxxxxxxxxxxx> wrote: > It was observed that rarely during USB disconnect happening shortly after > connect (before full initialization completes) usb_hub_wq would wait > forever for the dev_init_lock to be unlocked. dev_init_lock would remain > locked though because of infinite wait during usb_kill_urb: > > [ 2730.656472] kworker/0:2 D 0 260 2 0x00000000 > [ 2730.660700] Workqueue: events request_firmware_work_func > [ 2730.664807] [<809dca20>] (__schedule) from [<809dd164>] (schedule+0x4c/0xac) > [ 2730.670587] [<809dd164>] (schedule) from [<8069af44>] (usb_kill_urb+0xdc/0x114) > [ 2730.676815] [<8069af44>] (usb_kill_urb) from [<7f258b50>] (brcmf_usb_free_q+0x34/0xa8 [brcmfmac]) > [ 2730.684833] [<7f258b50>] (brcmf_usb_free_q [brcmfmac]) from [<7f2517d4>] (brcmf_detach+0xa0/0xb8 [brcmfmac]) > [ 2730.693557] [<7f2517d4>] (brcmf_detach [brcmfmac]) from [<7f251a34>] (brcmf_attach+0xac/0x3d8 [brcmfmac]) > [ 2730.702094] [<7f251a34>] (brcmf_attach [brcmfmac]) from [<7f2587ac>] (brcmf_usb_probe_phase2+0x468/0x4a0 [brcmfmac]) > [ 2730.711601] [<7f2587ac>] (brcmf_usb_probe_phase2 [brcmfmac]) from [<7f252888>] (brcmf_fw_request_done+0x194/0x220 [brcmfmac]) > [ 2730.721795] [<7f252888>] (brcmf_fw_request_done [brcmfmac]) from [<805748e4>] (request_firmware_work_func+0x4c/0x88) > [ 2730.731125] [<805748e4>] (request_firmware_work_func) from [<80141474>] (process_one_work+0x228/0x808) > [ 2730.739223] [<80141474>] (process_one_work) from [<80141a80>] (worker_thread+0x2c/0x564) > [ 2730.746105] [<80141a80>] (worker_thread) from [<80147bcc>] (kthread+0x13c/0x16c) > [ 2730.752227] [<80147bcc>] (kthread) from [<801010b4>] (ret_from_fork+0x14/0x20) > > [ 2733.099695] kworker/0:3 D 0 1065 2 0x00000000 > [ 2733.103926] Workqueue: usb_hub_wq hub_event > [ 2733.106914] [<809dca20>] (__schedule) from [<809dd164>] (schedule+0x4c/0xac) > [ 2733.112693] [<809dd164>] (schedule) from [<809e2a8c>] (schedule_timeout+0x214/0x3e4) > [ 2733.119621] [<809e2a8c>] (schedule_timeout) from [<809dde2c>] (wait_for_common+0xc4/0x1c0) > [ 2733.126810] [<809dde2c>] (wait_for_common) from [<7f258d00>] (brcmf_usb_disconnect+0x1c/0x4c [brcmfmac]) > [ 2733.135206] [<7f258d00>] (brcmf_usb_disconnect [brcmfmac]) from [<8069e0c8>] (usb_unbind_interface+0x5c/0x1e4) > [ 2733.143943] [<8069e0c8>] (usb_unbind_interface) from [<8056d3e8>] (device_release_driver_internal+0x164/0x1fc) > [ 2733.152769] [<8056d3e8>] (device_release_driver_internal) from [<8056c078>] (bus_remove_device+0xd0/0xfc) > [ 2733.161138] [<8056c078>] (bus_remove_device) from [<8056977c>] (device_del+0x11c/0x310) > [ 2733.167939] [<8056977c>] (device_del) from [<8069cba8>] (usb_disable_device+0xa0/0x1cc) > [ 2733.174743] [<8069cba8>] (usb_disable_device) from [<8069507c>] (usb_disconnect+0x74/0x1dc) > [ 2733.181823] [<8069507c>] (usb_disconnect) from [<80695e88>] (hub_event+0x478/0xf88) > [ 2733.188278] [<80695e88>] (hub_event) from [<80141474>] (process_one_work+0x228/0x808) > [ 2733.194905] [<80141474>] (process_one_work) from [<80141a80>] (worker_thread+0x2c/0x564) > [ 2733.201724] [<80141a80>] (worker_thread) from [<80147bcc>] (kthread+0x13c/0x16c) > [ 2733.207913] [<80147bcc>] (kthread) from [<801010b4>] (ret_from_fork+0x14/0x20) > > It was traced down to a case where usb_kill_urb would be called on an URB > structure containing more or less random data, including large number in > its use_count. During the debugging it appeared that in brcmf_usb_free_q() > the traversal over URBs' lists is not synchronized with operations on those > lists in brcmf_usb_rx_complete() leading to handling > brcmf_usbdev_info structure (holding lists' head) as lists' element and in > result causing above problem. > > Fix it by walking through all URBs during brcmf_cancel_all_urbs using the > arrays of requests instead of linked lists. > > Signed-off-by: Piotr Figiel <p.figiel@xxxxxxxxxxxxxxxxxxxxxx> 3 patches applied to wireless-drivers-next.git, thanks. db3b9e2e1d58 brcmfmac: fix race during disconnect when USB completion is in progress 2b78e5f52236 brcmfmac: remove pending parameter from brcmf_usb_free_q 504f06725d01 brcmfmac: remove unused variable i from brcmf_usb_free_q -- https://patchwork.kernel.org/patch/10845051/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
