[PATCH ath-next v7] wifi: ath12k: avoid dynamic alloc when parsing wmi tb

[Baochen Qiang]

On 4/7/2026 5:54 PM, Nicolas Escande wrote:
> On each WMI message received from the hardware, we alloc a temporary array
> of WMI_TAG_MAX entries of type void *. This array is then populated with
> pointers of parsed structs depending on the WMI type, and then freed. This
> alloc can fail when memory pressure in the system is high enough.
> 
> Given the fact that it is scheduled in softirq with the system_bh_wq, we
> should not be able to parse more than one WMI message per CPU at any time.
> 
> So instead lets move to a per cpu allocated array, that is reused across
> calls. This memory is allocated as needed and refcounted to exist only
> as long as one struct ath12k_base lives.
> 
> ath12k_wmi_tlv_parse_alloc() and ath12k_wmi_tlv_parse() are merged
> together as it no longer allocs mem but returns the existing per-cpu one.
> 
> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00218-QCAHKSWPL_SILICONZ-1
> 
> Signed-off-by: Nicolas Escande <nico.escande at gmail.com>

Reviewed-by: Baochen Qiang <baochen.qiang at oss.qualcomm.com>