[PATCH] wifi: ath12k: check M3 buffer size as well whey trying to reuse it

[Jeff Johnson]

On 4/24/2024 7:17 PM, Baochen Qiang wrote:
> Currently in recovery/resume cases, we do not free M3 buffer but
> instead will reuse it. This is done by checking m3_mem->vaddr: if it
> is not NULL we believe M3 buffer is ready and go ahead to reuse it.
> 
> Note that m3_mem->size is not checked. This is safe for now because
> currently M3 reuse logic only gets executed in recovery/resume cases
> and the size keeps unchanged in either of them.
> 
> However ideally the size should be checked as well, to make the code
> safer. So add the check there. Now if that check fails, free old M3
> buffer and reallocate a new one.
> 
> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.30
> 
> Fixes: 303c017821d8 ("wifi: ath12k: fix kernel crash during resume")
> Signed-off-by: Baochen Qiang <quic_bqiang at quicinc.com>
Acked-by: Jeff Johnson <quic_jjohnson at quicinc.com>