[PATCH] ath10k: skip ath10k_halt during suspend for driver state RESTARTING
kuabhs at chromium.org
Mon Apr 25 09:26:09 PDT 2022
Thanks Kalle for having a look and adding this on behalf of me.
Here is the Tested-on tag,
Tested-on: QCA6174 hw3.2 PCI WLAN.RM.4.4.1-00288-QCARMSWPZ-1
On Sun, Apr 24, 2022 at 11:14 PM Kalle Valo <kvalo at kernel.org> wrote:
> Abhishek Kumar <kuabhs at chromium.org> writes:
> > Double free crash is observed when FW recovery(caused by wmi
> > timeout/crash) is followed by immediate suspend event. The FW recovery
> > is triggered by ath10k_core_restart() which calls driver clean up via
> > ath10k_halt(). When the suspend event occurs between the FW recovery,
> > the restart worker thread is put into frozen state until suspend completes.
> > The suspend event triggers ath10k_stop() which again triggers ath10k_halt()
> > The double invocation of ath10k_halt() causes ath10k_htt_rx_free() to be
> > called twice(Note: ath10k_htt_rx_alloc was not called by restart worker
> > thread because of its frozen state), causing the crash.
> > To fix this, during the suspend flow, skip call to ath10k_halt() in
> > ath10k_stop() when the current driver state is ATH10K_STATE_RESTARTING.
> > Also, for driver state ATH10K_STATE_RESTARTING, call
> > ath10k_wait_for_suspend() in ath10k_stop(). This is because call to
> > ath10k_wait_for_suspend() is skipped later in
> > [ath10k_halt() > ath10k_core_stop()] for the driver state
> > ATH10K_STATE_RESTARTING.
> > The frozen restart worker thread will be cancelled during resume when the
> > device comes out of suspend.
> > Below is the crash stack for reference:
> > [ 428.469167] ------------[ cut here ]------------
> > [ 428.469180] kernel BUG at mm/slub.c:4150!
> > [ 428.469193] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
> > [ 428.469219] Workqueue: events_unbound async_run_entry_fn
> > [ 428.469230] RIP: 0010:kfree+0x319/0x31b
> > [ 428.469241] RSP: 0018:ffffa1fac015fc30 EFLAGS: 00010246
> > [ 428.469247] RAX: ffffedb10419d108 RBX: ffff8c05262b0000
> > [ 428.469252] RDX: ffff8c04a8c07000 RSI: 0000000000000000
> > [ 428.469256] RBP: ffffa1fac015fc78 R08: 0000000000000000
> > [ 428.469276] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [ 428.469285] Call Trace:
> > [ 428.469295] ? dma_free_attrs+0x5f/0x7d
> > [ 428.469320] ath10k_core_stop+0x5b/0x6f
> > [ 428.469336] ath10k_halt+0x126/0x177
> > [ 428.469352] ath10k_stop+0x41/0x7e
> > [ 428.469387] drv_stop+0x88/0x10e
> > [ 428.469410] __ieee80211_suspend+0x297/0x411
> > [ 428.469441] rdev_suspend+0x6e/0xd0
> > [ 428.469462] wiphy_suspend+0xb1/0x105
> > [ 428.469483] ? name_show+0x2d/0x2d
> > [ 428.469490] dpm_run_callback+0x8c/0x126
> > [ 428.469511] ? name_show+0x2d/0x2d
> > [ 428.469517] __device_suspend+0x2e7/0x41b
> > [ 428.469523] async_suspend+0x1f/0x93
> > [ 428.469529] async_run_entry_fn+0x3d/0xd1
> > [ 428.469535] process_one_work+0x1b1/0x329
> > [ 428.469541] worker_thread+0x213/0x372
> > [ 428.469547] kthread+0x150/0x15f
> > [ 428.469552] ? pr_cont_work+0x58/0x58
> > [ 428.469558] ? kthread_blkcg+0x31/0x31
> > Signed-off-by: Abhishek Kumar <kuabhs at chromium.org>
> > Co-developed-by: Wen Gong <quic_wgong at quicinc.com>
> > Signed-off-by: Wen Gong <quic_wgong at quicinc.com>
> Tested-on tag missing, but I can add it if you provide it.
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