drm/mst: Fix MST sideband up-reply failure handling ...
Fix the breakage resulting in the stacktrace below, due to tx queue
being full when trying to send an up-reply. txmsg->seqno is -1 in this
case leading to a corruption of the mstb object by
txmsg->dst->tx_slots[txmsg->seqno] = NULL;
in process_single_up_tx_qlock().
[ +0,005162] [drm:process_single_tx_qlock [drm_kms_helper]] set_hdr_from_dst_qlock: failed to find slot
[ +0,000015] [drm:drm_dp_send_up_ack_reply.constprop.19 [drm_kms_helper]] failed to send msg in q -11
[ +0,000939] BUG: kernel NULL pointer dereference, address: 00000000000005a0
[ +0,006982] #PF: supervisor write access in kernel mode
[ +0,005223] #PF: error_code(0x0002) - not-present page
[ +0,005135] PGD 0 P4D 0
[ +0,002581] Oops: 0002 [#1 ] PREEMPT SMP NOPTI
[ +0,004359] CPU: 1 PID: 1200 Comm: kworker/u16:3 Tainted: G U 5.2.0-rc1+ #410
[ +0,008433] Hardware name: Intel Corporation Ice Lake Client Platform/IceLake U DDR4 SODIMM PD RVP, BIOS ICLSFWR1.R00.3175.A00.1904261428 04/26/2019
[ +0,013323] Workqueue: i915-dp i915_digport_work_func [i915]
[ +0,005676] RIP: 0010:queue_work_on+0x19/0x70
[ +0,004372] Code: ff ff ff 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 41 56 49 89 f6 41 55 41 89 fd 41 54 55 53 48 89 d3 9c 5d fa e8 e7 81 0c 00 <f0> 48 0f ba 2b 00 73 31 45 31 e4 f7 c5 00 02 00 00 74 13 e8 cf 7f
[ +0,018750] RSP: 0018:ffffc900007dfc50 EFLAGS: 00010006
[ +0,005222] RAX: 0000000000000046 RBX: 00000000000005a0 RCX: 0000000000000001
[ +0,007133] RDX: 000000000001b608 RSI: 0000000000000000 RDI: ffffffff82121972
[ +0,007129] RBP: 0000000000000202 R08: 0000000000000000 R09: 0000000000000001
[ +0,007129] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88847bfa5096
[ +0,007131] R13: 0000000000000010 R14: ffff88849c08f3f8 R15: 0000000000000000
[ +0,007128] FS: 0000000000000000(0000) GS:ffff88849dc80000(0000) knlGS:0000000000000000
[ +0,008083] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ +0,005749] CR2: 00000000000005a0 CR3: 0000000005210006 CR4: 0000000000760ee0
[ +0,007128] PKRU: 55555554
[ +0,002722] Call Trace:
[ +0,002458] drm_dp_mst_handle_up_req+0x517/0x540 [drm_kms_helper]
[ +0,006197] ? drm_dp_mst_hpd_irq+0x5b/0x9c0 [drm_kms_helper]
[ +0,005764] drm_dp_mst_hpd_irq+0x5b/0x9c0 [drm_kms_helper]
[ +0,005623] ? intel_dp_hpd_pulse+0x205/0x370 [i915]
[ +0,005018] intel_dp_hpd_pulse+0x205/0x370 [i915]
[ +0,004836] i915_digport_work_func+0xbb/0x140 [i915]
[ +0,005108] process_one_work+0x245/0x610
[ +0,004027] worker_thread+0x37/0x380
[ +0,003684] ? process_one_work+0x610/0x610
[ +0,004184] kthread+0x119/0x130
[ +0,003240] ? kthread_park+0x80/0x80
[ +0,003668] ret_from_fork+0x24/0x50
Cc: Lyude Paul <lyude@redhat.com>
Cc: Dave Airlie <airlied@redhat.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190523212433.9058-1-imre.deak@intel.com
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