[PATCH v2] ath10k: skip ath10k_halt during suspend for driver state RESTARTING

Brian Norris briannorris at chromium.org
Tue Apr 26 15:34:02 PDT 2022

On Tue, Apr 26, 2022 at 3:20 PM Abhishek Kumar <kuabhs at chromium.org> wrote:
> 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.
> Tested-on: QCA6174 hw3.2 PCI WLAN.RM.4.4.1-00288-QCARMSWPZ-1
> Co-developed-by: Wen Gong <quic_wgong at quicinc.com>
> Signed-off-by: Wen Gong <quic_wgong at quicinc.com>
> Signed-off-by: Abhishek Kumar <kuabhs at chromium.org>
> ---
> Changes in v2:
> - Fixed typo, replaced ath11k by ath10k in the comments.
> - Adjusted the position of my S-O-B tag.
> - Added the Tested-on tag.

You could have retained my:

Reviewed-by: Brian Norris <briannorris at chromium.org>

but no worries; it's just a few characters ;)

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