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linux-sg2042/drivers/usb/gadget/function
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Vincent Pelletier d52e4d0c0c usb: gadget: ffs: Fix BUG when userland exits with submitted AIO transfers 
This bug happens only when the UDC needs to sleep during usb_ep_dequeue,
as is the case for (at least) dwc3.

[  382.200896] BUG: scheduling while atomic: screen/1808/0x00000100
[  382.207124] 4 locks held by screen/1808:
[  382.211266]  #0:  (rcu_callback){....}, at: [<c10b4ff0>] rcu_process_callbacks+0x260/0x440
[  382.219949]  #1:  (rcu_read_lock_sched){....}, at: [<c1358ba0>] percpu_ref_switch_to_atomic_rcu+0xb0/0x130
[  382.230034]  #2:  (&(&ctx->ctx_lock)->rlock){....}, at: [<c11f0c73>] free_ioctx_users+0x23/0xd0
[  382.230096]  #3:  (&(&ffs->eps_lock)->rlock){....}, at: [<f81e7710>] ffs_aio_cancel+0x20/0x60 [usb_f_fs]
[  382.230160] Modules linked in: usb_f_fs libcomposite configfs bnep btsdio bluetooth ecdh_generic brcmfmac brcmutil intel_powerclamp coretemp dwc3 kvm_intel ulpi udc_core kvm irqbypass crc32_pclmul crc32c_intel pcbc dwc3_pci aesni_intel aes_i586 crypto_simd cryptd ehci_pci ehci_hcd gpio_keys usbcore basincove_gpadc industrialio usb_common
[  382.230407] CPU: 1 PID: 1808 Comm: screen Not tainted 4.14.0-edison+ #117
[  382.230416] Hardware name: Intel Corporation Merrifield/BODEGA BAY, BIOS 542 2015.01.21:18.19.48
[  382.230425] Call Trace:
[  382.230438]  <SOFTIRQ>
[  382.230466]  dump_stack+0x47/0x62
[  382.230498]  __schedule_bug+0x61/0x80
[  382.230522]  __schedule+0x43/0x7a0
[  382.230587]  schedule+0x5f/0x70
[  382.230625]  dwc3_gadget_ep_dequeue+0x14c/0x270 [dwc3]
[  382.230669]  ? do_wait_intr_irq+0x70/0x70
[  382.230724]  usb_ep_dequeue+0x19/0x90 [udc_core]
[  382.230770]  ffs_aio_cancel+0x37/0x60 [usb_f_fs]
[  382.230798]  kiocb_cancel+0x31/0x40
[  382.230822]  free_ioctx_users+0x4d/0xd0
[  382.230858]  percpu_ref_switch_to_atomic_rcu+0x10a/0x130
[  382.230881]  ? percpu_ref_exit+0x40/0x40
[  382.230904]  rcu_process_callbacks+0x2b3/0x440
[  382.230965]  __do_softirq+0xf8/0x26b
[  382.231011]  ? __softirqentry_text_start+0x8/0x8
[  382.231033]  do_softirq_own_stack+0x22/0x30
[  382.231042]  </SOFTIRQ>
[  382.231071]  irq_exit+0x45/0xc0
[  382.231089]  smp_apic_timer_interrupt+0x13c/0x150
[  382.231118]  apic_timer_interrupt+0x35/0x3c
[  382.231132] EIP: __copy_user_ll+0xe2/0xf0
[  382.231142] EFLAGS: 00210293 CPU: 1
[  382.231154] EAX: bfd4508c EBX: 00000004 ECX: 00000003 EDX: f3d8fe50
[  382.231165] ESI: f3d8fe51 EDI: bfd4508d EBP: f3d8fe14 ESP: f3d8fe08
[  382.231176]  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[  382.231265]  core_sys_select+0x25f/0x320
[  382.231346]  ? __wake_up_common_lock+0x62/0x80
[  382.231399]  ? tty_ldisc_deref+0x13/0x20
[  382.231438]  ? ldsem_up_read+0x1b/0x40
[  382.231459]  ? tty_ldisc_deref+0x13/0x20
[  382.231479]  ? tty_write+0x29f/0x2e0
[  382.231514]  ? n_tty_ioctl+0xe0/0xe0
[  382.231541]  ? tty_write_unlock+0x30/0x30
[  382.231566]  ? __vfs_write+0x22/0x110
[  382.231604]  ? security_file_permission+0x2f/0xd0
[  382.231635]  ? rw_verify_area+0xac/0x120
[  382.231677]  ? vfs_write+0x103/0x180
[  382.231711]  SyS_select+0x87/0xc0
[  382.231739]  ? SyS_write+0x42/0x90
[  382.231781]  do_fast_syscall_32+0xd6/0x1a0
[  382.231836]  entry_SYSENTER_32+0x47/0x71
[  382.231848] EIP: 0xb7f75b05
[  382.231857] EFLAGS: 00000246 CPU: 1
[  382.231868] EAX: ffffffda EBX: 00000400 ECX: bfd4508c EDX: bfd4510c
[  382.231878] ESI: 00000000 EDI: 00000000 EBP: 00000000 ESP: bfd45020
[  382.231889]  DS: 007b ES: 007b FS: 0000 GS: 0033 SS: 007b
[  382.232281] softirq: huh, entered softirq 9 RCU c10b4d90 with preempt_count 00000100, exited with 00000000?

Tested-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Vincent Pelletier <plr.vincent@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
 		2018-06-18 12:40:59 +03:00
..
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
f_acm.c A couple of configfs cleanups: 2017-11-14 14:44:04 -08:00
f_ecm.c usb: gadget: f_ecm: fix host mac address for multiple instances 2018-05-15 10:17:18 +03:00
f_eem.c net: drivers/net: Remove unnecessary skb_copy_expand OOM messages 2018-03-15 14:28:03 -04:00
f_fs.c usb: gadget: ffs: Fix BUG when userland exits with submitted AIO transfers 2018-06-18 12:40:59 +03:00
f_hid.c vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
f_loopback.c A couple of configfs cleanups: 2017-11-14 14:44:04 -08:00
f_mass_storage.c A couple of configfs cleanups: 2017-11-14 14:44:04 -08:00
f_mass_storage.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
f_midi.c - Introduce arithmetic overflow test helper functions (Rasmus) 2018-06-06 17:27:14 -07:00
f_ncm.c usb/gadget/NCM: Replace tasklet with softirq hrtimer 2018-01-16 09:51:23 +01:00
f_obex.c A couple of configfs cleanups: 2017-11-14 14:44:04 -08:00
f_phonet.c usb: gadget: f_phonet: fix pn_net_xmit()'s return type 2018-05-21 10:36:14 +03:00
f_printer.c usb: gadget: function: printer: avoid wrong list handling in printer_write() 2018-05-24 18:14:28 +02:00
f_rndis.c A couple of configfs cleanups: 2017-11-14 14:44:04 -08:00
f_serial.c A couple of configfs cleanups: 2017-11-14 14:44:04 -08:00
f_sourcesink.c A couple of configfs cleanups: 2017-11-14 14:44:04 -08:00
f_subset.c A couple of configfs cleanups: 2017-11-14 14:44:04 -08:00
f_tcm.c USB: gadget: function: remove redundant initialization of 'tv_nexus' 2018-03-08 15:12:01 +02:00
f_uac1.c A couple of configfs cleanups: 2017-11-14 14:44:04 -08:00
f_uac1_legacy.c usb: Remove Blackfin references in USB support 2018-03-26 15:57:16 +02:00
f_uac2.c usb: gadget: f_uac2: fix bFirstInterface in composite gadget 2018-02-12 10:48:59 +02:00
f_uvc.c USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
f_uvc.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
g_zero.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
ndis.h
…
rndis.c USB: rndis: Fix for handling garbled messages 2018-05-15 10:24:28 +03:00
rndis.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
storage_common.c USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
storage_common.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
tcm.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
u_audio.c USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_audio.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_ecm.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_eem.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_ether.c USB: Gadget Ethernet: Re-enable Jumbo frames. 2018-05-15 10:17:14 +03:00
u_ether.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_ether_configfs.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_fs.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_gether.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_hid.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_midi.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_ncm.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_phonet.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_printer.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_rndis.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_serial.c usb: gadget: u_serial: Use kfifo instead of homemade circular buffer 2017-12-11 12:36:50 +02:00
u_serial.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_tcm.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_uac1.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_uac1_legacy.c usb: Remove Blackfin references in USB support 2018-03-26 15:57:16 +02:00
u_uac1_legacy.h usb: Remove Blackfin references in USB support 2018-03-26 15:57:16 +02:00
u_uac2.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
u_uvc.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
uvc.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
uvc_configfs.c A couple of configfs cleanups: 2017-11-14 14:44:04 -08:00
uvc_configfs.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
uvc_queue.c media: annotate ->poll() instances 2017-11-27 16:20:06 -05:00
uvc_queue.h media: annotate ->poll() instances 2017-11-27 16:20:06 -05:00
uvc_v4l2.c media: annotate ->poll() instances 2017-11-27 16:20:06 -05:00
uvc_v4l2.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
uvc_video.c USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00
uvc_video.h USB: gadget: function: Remove redundant license text 2017-11-07 15:45:02 +01:00