Luca Weiss <luca.weiss@xxxxxxxxxxxxx> wrote:
> If we already have gotten the rproc_handle (meaning the "qcom,rproc"
> property is defined in the devicetree), it's a valid state that the
> remoteproc module hasn't probed yet so we should defer probing instead
> of just failing to probe.
>
> This resolves a race condition when the ath11k driver probes and fails
> before the wpss remoteproc driver has probed, like the following:
>
> [ 6.232360] ath11k 17a10040.wifi: failed to get rproc
> [ 6.232366] ath11k 17a10040.wifi: failed to get rproc: -22
> [ 6.232478] ath11k: probe of 17a10040.wifi failed with error -22
> ...
> [ 6.252415] remoteproc remoteproc2: 8a00000.remoteproc is available
> [ 6.252776] remoteproc remoteproc2: powering up 8a00000.remoteproc
> [ 6.252781] remoteproc remoteproc2: Booting fw image qcom/qcm6490/fairphone5/wpss.mdt, size 7188
>
> So, defer the probe if we hit that so we can retry later once the wpss
> remoteproc is available.
>
> Tested-on: WCN6750 hw1.0 AHB WLAN.MSL.1.0.1-01264-QCAMSLSWPLZ-1.37886.3
>
> Fixes: d5c65159f289 ("ath11k: driver for Qualcomm IEEE 802.11ax devices")
> Signed-off-by: Luca Weiss <luca.weiss@xxxxxxxxxxxxx>
> Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx>
Patch applied to ath-next branch of ath.git, thanks.
2a3ec40b98b4 wifi: ath11k: Defer on rproc_get failure
--
https://patchwork.kernel.org/project/linux-wireless/patch/20231027-ath11k-rproc-defer-v1-1-f6b6a812cd18@xxxxxxxxxxxxx/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
