[PATCH] wifi: ath12k: fix ACPI warning when resume

[Jeff Johnson]

On 5/30/2024 7:40 PM, Baochen Qiang wrote:
> Currently ACPI notification handler is installed when driver loads and only
> gets removed when driver unloads. During resume after firmware is reloaded,
> ath12k tries to install it by default. Since it is installed already, ACPI
> subsystem rejects it and returns an error:
> 
> [   83.094206] ath12k_pci 0000:03:00.0: failed to install DSM notify callback: 7
> 
> Fix it by removing that handler when going to suspend. This also avoid any
> possible ACPI call to firmware before firmware is reloaded/reinitialized.
> 
> Note ab->acpi also needs to be cleared in ath12k_acpi_stop() such that we
> are in a clean state when ACPI structures are reinitialized in
> ath12k_acpi_start().
> 
> Tested-on: WCN7850 HW2.0 PCI WLAN.HMT.1.0.c5-00481-QCAHMTSWPL_V1.0_V2.0_SILICONZ-3
> 
> Fixes: 576771c9fa21 ("wifi: ath12k: ACPI TAS support")
> Signed-off-by: Baochen Qiang <quic_bqiang at quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson at quicinc.com>