/* SCTP kernel implementation * (C) Copyright IBM Corp. 2001, 2004 * Copyright (c) 1999-2000 Cisco, Inc. * Copyright (c) 1999-2001 Motorola, Inc. * Copyright (c) 2001 Intel Corp. * * This file is part of the SCTP kernel implementation * * This file converts numerical ID value to alphabetical names for SCTP * terms such as chunk type, parameter time, event type, etc. * * This SCTP implementation is free software; * you can redistribute it and/or modify it under the terms of * the GNU General Public License as published by * the Free Software Foundation; either version 2, or (at your option) * any later version. * * This SCTP implementation is distributed in the hope that it * will be useful, but WITHOUT ANY WARRANTY; without even the implied * ************************ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * See the GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with GNU CC; see the file COPYING. If not, see * . * * Please send any bug reports or fixes you make to the * email address(es): * lksctp developers * * Written or modified by: * La Monte H.P. Yarroll * Karl Knutson * Xingang Guo * Jon Grimm * Daisy Chang * Sridhar Samudrala */ #include /* These are printable forms of Chunk ID's from section 3.1. */ static const char *const sctp_cid_tbl[SCTP_NUM_BASE_CHUNK_TYPES] = { "DATA", "INIT", "INIT_ACK", "SACK", "HEARTBEAT", "HEARTBEAT_ACK", "ABORT", "SHUTDOWN", "SHUTDOWN_ACK", "ERROR", "COOKIE_ECHO", "COOKIE_ACK", "ECN_ECNE", "ECN_CWR", "SHUTDOWN_COMPLETE", }; /* Lookup "chunk type" debug name. */ const char *sctp_cname(const sctp_subtype_t cid) { if (cid.chunk <= SCTP_CID_BASE_MAX) return sctp_cid_tbl[cid.chunk]; switch (cid.chunk) { case SCTP_CID_ASCONF: return "ASCONF"; case SCTP_CID_ASCONF_ACK: return "ASCONF_ACK"; case SCTP_CID_FWD_TSN: return "FWD_TSN"; case SCTP_CID_AUTH: return "AUTH"; default: break; } return "unknown chunk"; } /* These are printable forms of the states. */ const char *const sctp_state_tbl[SCTP_STATE_NUM_STATES] = { "STATE_CLOSED", "STATE_COOKIE_WAIT", "STATE_COOKIE_ECHOED", "STATE_ESTABLISHED", "STATE_SHUTDOWN_PENDING", "STATE_SHUTDOWN_SENT", "STATE_SHUTDOWN_RECEIVED", "STATE_SHUTDOWN_ACK_SENT", }; /* Events that could change the state of an association. */ const char *const sctp_evttype_tbl[] = { "EVENT_T_unknown", "EVENT_T_CHUNK", "EVENT_T_TIMEOUT", "EVENT_T_OTHER", "EVENT_T_PRIMITIVE" }; /* Return value of a state function */ const char *const sctp_status_tbl[] = { "DISPOSITION_DISCARD", "DISPOSITION_CONSUME", "DISPOSITION_NOMEM", "DISPOSITION_DELETE_TCB", "DISPOSITION_ABORT", "DISPOSITION_VIOLATION", "DISPOSITION_NOT_IMPL", "DISPOSITION_ERROR", "DISPOSITION_BUG" }; /* Printable forms of primitives */ static const char *const sctp_primitive_tbl[SCTP_NUM_PRIMITIVE_TYPES] = { "PRIMITIVE_ASSOCIATE", "PRIMITIVE_SHUTDOWN", "PRIMITIVE_ABORT", "PRIMITIVE_SEND", "PRIMITIVE_REQUESTHEARTBEAT", "PRIMITIVE_ASCONF", }; /* Lookup primitive debug name. */ const char *sctp_pname(const sctp_subtype_t id) { if (id.primitive <= SCTP_EVENT_PRIMITIVE_MAX) return sctp_primitive_tbl[id.primitive]; return "unknown_primitive"; } static const char *const sctp_other_tbl[] = { "NO_PENDING_TSN", "ICMP_PROTO_UNREACH", }; /* Lookup "other" debug name. */ const char *sctp_oname(const sctp_subtype_t id) { if (id.other <= SCTP_EVENT_OTHER_MAX) return sctp_other_tbl[id.other]; return "unknown 'other' event"; } static const char *const sctp_timer_tbl[] = { "TIMEOUT_NONE", "TIMEOUT_T1_COOKIE", "TIMEOUT_T1_INIT", "TIMEOUT_T2_SHUTDOWN", "TIMEOUT_T3_RTX", "TIMEOUT_T4_RTO", "TIMEOUT_T5_SHUTDOWN_GUARD", "TIMEOUT_HEARTBEAT", "TIMEOUT_RECONF", "TIMEOUT_SACK", "TIMEOUT_AUTOCLOSE", }; /* Lookup timer debug name. */ const char *sctp_tname(const sctp_subtype_t id) { BUILD_BUG_ON(SCTP_EVENT_TIMEOUT_MAX + 1 != ARRAY_SIZE(sctp_timer_tbl)); if (id.timeout < ARRAY_SIZE(sctp_timer_tbl)) return sctp_timer_tbl[id.timeout]; return "unknown_timer"; } selected='selected'>unified
authorLinus Torvalds <torvalds@linux-foundation.org>2017-01-29 13:50:06 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-29 13:50:06 -0800
commit39cb2c9a316e77f6dfba96c543e55b6672d5a37e (patch)
tree98fe974ee4e20121253de7f61fc8d01bdb3821c1 /sound/usb/usx2y/usbusx2y.h
parent2c5d9555d6d937966d79d4c6529a5f7b9206e405 (diff)
drm/i915: Check for NULL i915_vma in intel_unpin_fb_obj()
I've seen this trigger twice now, where the i915_gem_object_to_ggtt() call in intel_unpin_fb_obj() returns NULL, resulting in an oops immediately afterwards as the (inlined) call to i915_vma_unpin_fence() tries to dereference it. It seems to be some race condition where the object is going away at shutdown time, since both times happened when shutting down the X server. The call chains were different: - VT ioctl(KDSETMODE, KD_TEXT): intel_cleanup_plane_fb+0x5b/0xa0 [i915] drm_atomic_helper_cleanup_planes+0x6f/0x90 [drm_kms_helper] intel_atomic_commit_tail+0x749/0xfe0 [i915] intel_atomic_commit+0x3cb/0x4f0 [i915] drm_atomic_commit+0x4b/0x50 [drm] restore_fbdev_mode+0x14c/0x2a0 [drm_kms_helper] drm_fb_helper_restore_fbdev_mode_unlocked+0x34/0x80 [drm_kms_helper] drm_fb_helper_set_par+0x2d/0x60 [drm_kms_helper] intel_fbdev_set_par+0x18/0x70 [i915] fb_set_var+0x236/0x460 fbcon_blank+0x30f/0x350 do_unblank_screen+0xd2/0x1a0 vt_ioctl+0x507/0x12a0 tty_ioctl+0x355/0xc30 do_vfs_ioctl+0xa3/0x5e0 SyS_ioctl+0x79/0x90 entry_SYSCALL_64_fastpath+0x13/0x94 - i915 unpin_work workqueue: intel_unpin_work_fn+0x58/0x140 [i915] process_one_work+0x1f1/0x480 worker_thread+0x48/0x4d0 kthread+0x101/0x140 and this patch purely papers over the issue by adding a NULL pointer check and a WARN_ON_ONCE() to avoid the oops that would then generally make the machine unresponsive. Other callers of i915_gem_object_to_ggtt() seem to also check for the returned pointer being NULL and warn about it, so this clearly has happened before in other places. [ Reported it originally to the i915 developers on Jan 8, applying the ugly workaround on my own now after triggering the problem for the second time with no feedback. This is likely to be the same bug reported as https://bugs.freedesktop.org/show_bug.cgi?id=98829 https://bugs.freedesktop.org/show_bug.cgi?id=99134 which has a patch for the underlying problem, but it hasn't gotten to me, so I'm applying the workaround. ] Cc: Daniel Vetter <daniel.vetter@intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Imre Deak <imre.deak@intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'sound/usb/usx2y/usbusx2y.h')