[PATCH 1/2] wifi: ath12k: Ignore fragments from uninitialized peer in dp

[Jeff Johnson]

On 8/8/2023 9:27 PM, Harshitha Prem wrote:
> When max virtual ap interfaces are configured in all the bands
> with ACS and hostapd restart is done every 60s,
> a crash is observed at random times.

nit: please fill the paragraph to 70+ columns

> 
> In the above scenario, a fragmented packet is received for self peer,
> for which rx_tid and rx_frags are not initialized in datapath.
> While handling this fragment, crash is observed as the rx_frag list
> is uninitialised and when we walk in ath12k_dp_rx_h_sort_frags,

nit: s/uninitialised /uninitialized/

> skb null leads to exception.
> 
> To address this, before processing received fragments we check
> dp_setup_done flag is set to ensure that peer has completed its
> dp peer setup for fragment queue, else ignore processing the
> fragments.
> 
> Call trace:
>      PC points to "ath12k_dp_process_rx_err+0x4e8/0xfcc [ath12k]"
>      LR points to "ath12k_dp_process_rx_err+0x480/0xfcc [ath12k]".
>      The Backtrace obtained is as follows:
>      ath12k_dp_process_rx_err+0x4e8/0xfcc [ath12k]
>      ath12k_dp_service_srng+0x78/0x260 [ath12k]
>      ath12k_pci_write32+0x990/0xb0c [ath12k]
>      __napi_poll+0x30/0xa4
>      net_rx_action+0x118/0x270
>      __do_softirq+0x10c/0x244
>      irq_exit+0x64/0xb4
>      __handle_domain_irq+0x88/0xac
>      gic_handle_irq+0x74/0xbc
>      el1_irq+0xf0/0x1c0
>      arch_cpu_idle+0x10/0x18
>      do_idle+0x104/0x248
>      cpu_startup_entry+0x20/0x64
>      rest_init+0xd0/0xdc
>      arch_call_rest_init+0xc/0x14
> 
> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.0.1-00029-QCAHKSWPL_SILICONZ-1
> 
> Signed-off-by: Harshitha Prem <quic_hprem at quicinc.com>
> ---

actual code patch LGTM