Rakesh Pillai <pillair@xxxxxxxxxxxxxx> wrote:
> The management packets, send to firmware via WMI, are
> mapped using the direction DMA_TO_DEVICE. Currently in
> case of wmi cleanup, these buffers are being unmapped
> using an incorrect DMA direction. This can cause unwanted
> behavior when the host driver is handling a restart
> of the wlan firmware.
>
> We might see a trace like below
>
> [<ffffff8008098b18>] __dma_inv_area+0x28/0x58
> [<ffffff8001176734>] ath10k_wmi_mgmt_tx_clean_up_pending+0x60/0xb0 [ath10k_core]
> [<ffffff80088c7c50>] idr_for_each+0x78/0xe4
> [<ffffff80011766a4>] ath10k_wmi_detach+0x4c/0x7c [ath10k_core]
> [<ffffff8001163d7c>] ath10k_core_stop+0x58/0x68 [ath10k_core]
> [<ffffff800114fb74>] ath10k_halt+0xec/0x13c [ath10k_core]
> [<ffffff8001165110>] ath10k_core_restart+0x11c/0x1a8 [ath10k_core]
> [<ffffff80080c36bc>] process_one_work+0x16c/0x31c
>
> Fix the incorrect DMA direction during the wmi
> management tx buffer cleanup.
>
> Tested HW: WCN3990
> Tested FW: WLAN.HL.3.1-00784-QCAHLSWMTPLZ-1
>
> Fixes: dc405152bb6 ("ath10k: handle mgmt tx completion event")
> Signed-off-by: Rakesh Pillai <pillair@xxxxxxxxxxxxxx>
> Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
Patch applied to ath-next branch of ath.git, thanks.
6ba8b3b6bd77 ath10k: Correct the DMA direction for management tx buffers
--
https://patchwork.kernel.org/patch/11343145/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
