On Fri, 2016-07-01 at 16:52 +0200, Benjamin Tissoires wrote: > > I spent a good amount of time trying to figure out where the bug was, > and I couldn't reproduce it either with uhid or even with usb_gadget. > Even KASan doesn't gives any wrong memory access, and I can't > understand why you get this faulty behavior. > > So I must say, I am puzzled on why you end up calling > usbhid_init_reports() while the quirk HID_QUIRK_NO_INIT_REPORTS > should be in place. > Would you mind adding some printk() in hid-multitouch to dump the > value of hdev->quirks before and after calling hid_hw_start() in > mt_probe()? > > Also, ideally, if you could add a dump_stack() in > drivers/hid/usbhid/hid-core.c, right before leaving > usbhid_init_reports(), that would be awesome. > Here's a dmesg dump. It seems the quirks aren't cleared. [ 3.787730] Pre-hid_hw_start hdev->quirks: -2147483328 [ 3.787731] clocksource: Switched to clocksource tsc [ 4.217617] scsi 4:0:0:0: Direct-Access Generic- USB3.0 CRW -SD 1.00 PQ: 0 ANSI: 6 [ 4.218413] sd 4:0:0:0: Attached scsi generic sg2 type 0 [ 5.011924] Console: switching to colour frame buffer device 270x90 [ 5.030415] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device [ 5.471214] sd 4:0:0:0: [sdc] 31116288 512-byte logical blocks: (15.9 GB/14.8 GiB) [ 5.474542] sd 4:0:0:0: [sdc] Write Protect is off [ 5.474547] sd 4:0:0:0: [sdc] Mode Sense: 2f 00 00 00 [ 5.477097] sd 4:0:0:0: [sdc] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA [ 5.492349] sdc: sdc1 [ 5.494359] sd 4:0:0:0: [sdc] Attached SCSI removable disk [ 7.817402] CPU: 3 PID: 338 Comm: systemd-udevd Not tainted 4.7.0-rc7+ #7 [ 7.817409] Hardware name: Microsoft Corporation Surface Pro 3/Surface Pro 3, BIOS 3.11.0850 04/07/2015 [ 7.817413] 0000000000000286 000000007db35b48 ffff880145c839f8 ffffffff813d618f [ 7.817420] 0000000000000000 ffff880149404000 ffff880145c83a28 ffffffff81688b7e [ 7.817425] ffff880145c68350 0000000000000002 ffff880149404000 ffff88003fb5ad08 [ 7.817430] Call Trace: [ 7.817443] [<ffffffff813d618f>] dump_stack+0x63/0x84 [ 7.817453] [<ffffffff81688b7e>] usbhid_init_reports+0xde/0x110 [ 7.817459] [<ffffffff816890da>] usbhid_start+0x52a/0x770 [ 7.817465] [<ffffffff81686fc0>] ? hid_retry_timeout+0x60/0x60 [ 7.817471] [<ffffffff81686710>] ? usbhid_restart_out_queue+0x110/0x110 [ 7.817481] [<ffffffffa00535f5>] mt_probe+0x1b5/0x263 [hid_multitouch] [ 7.817487] [<ffffffff8167c707>] hid_device_probe+0xd7/0x150 [ 7.817492] [<ffffffff8151cbac>] driver_probe_device+0x22c/0x440 [ 7.817496] [<ffffffff8151ce91>] __driver_attach+0xd1/0xf0 [ 7.817500] [<ffffffff8151cdc0>] ? driver_probe_device+0x440/0x440 [ 7.817508] [<ffffffff8151a4dc>] bus_for_each_dev+0x6c/0xc0 [ 7.817512] [<ffffffff8151c29e>] driver_attach+0x1e/0x20 [ 7.817517] [<ffffffff8151bce3>] bus_add_driver+0x1c3/0x280 [ 7.817522] [<ffffffffa0011000>] ? 0xffffffffa0011000 [ 7.817526] [<ffffffff8151d7e0>] driver_register+0x60/0xe0 [ 7.817529] [<ffffffffa0011000>] ? 0xffffffffa0011000 [ 7.817533] [<ffffffff8167b543>] __hid_register_driver+0x53/0x90 [ 7.817540] [<ffffffffa001101e>] mt_driver_init+0x1e/0x1000 [hid_multitouch] [ 7.817547] [<ffffffff81002190>] do_one_initcall+0x50/0x180 [ 7.817554] [<ffffffff811d9cba>] ? kvfree+0x2a/0x40 [ 7.817561] [<ffffffff81221099>] ? kfree+0x159/0x170 [ 7.817567] [<ffffffff8121fb82>] ? kmem_cache_alloc_trace+0x182/0x1d0 [ 7.817574] [<ffffffff811b6116>] ? do_init_module+0x27/0x1d8 [ 7.817580] [<ffffffff811b614e>] do_init_module+0x5f/0x1d8 [ 7.817589] [<ffffffff8112ecdc>] load_module+0x1fdc/0x27d0 [ 7.817595] [<ffffffff8112bbb0>] ? __symbol_put+0x60/0x60 [ 7.817605] [<ffffffff8124555b>] ? vfs_read+0x11b/0x130 [ 7.817612] [<ffffffff8112f746>] SYSC_finit_module+0xe6/0x120 [ 7.817619] [<ffffffff8112f79e>] SyS_finit_module+0xe/0x10 [ 7.817623] [<ffffffff81003d52>] do_syscall_64+0x62/0x110 [ 7.817631] [<ffffffff817e0ca1>] entry_SYSCALL64_slow_path+0x25/0x25 [ 7.818076] input: Microsoft Surface Type Cover Keyboard as /devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/0003:045E:07DC.0001/input/input2 [ 7.869886] input: Microsoft Surface Type Cover Consumer Control as /devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/0003:045E:07DC.0001/input/input4 [ 7.870276] input: Microsoft Surface Type Cover Touchpad as /devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/0003:045E:07DC.0001/input/input6 [ 7.870849] hid-multitouch 0003:045E:07DC.0001: input,hiddev0,hidraw0: USB HID v1.11 Keyboard [Microsoft Surface Type Cover] on usb-0000:00:14.0-3/input0 [ 7.870857] Post-hid_hw_start hdev->quirks: -2147483328 Sincerely, Dennis Chen
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