Re: [PATCH] brcmfmac: pcie: fix oops on failure to resume and reprobe

[Ahmad Fatoum]

On 17.08.21 08:35, Ahmad Fatoum wrote:
> When resuming from suspend, brcmf_pcie_pm_leave_D3 will first attempt a
> hot resume and then fall back to removing the PCI device and then
> reprobing. If this probe fails, the kernel will oops, because brcmf_err,
> which is called to report the failure will dereference the stale bus
> pointer. Open code and use the default bus-less brcmf_err to avoid this.

Should've included a Fixes tag:

Fixes: 8602e62441ab ("brcmfmac: pass bus to the __brcmf_err() in pcie.c")

Please let me know if I should resend with the tag added.

Cheers,
Ahmad
 
> Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
> ---
> To: Arend van Spriel <aspriel@xxxxxxxxx>
> To: Franky Lin <franky.lin@xxxxxxxxxxxx>
> To: Hante Meuleman <hante.meuleman@xxxxxxxxxxxx>
> To: Chi-hsien Lin <chi-hsien.lin@xxxxxxxxxxxx>
> To: Wright Feng <wright.feng@xxxxxxxxxxxx>
> To: Chung-hsien Hsu <chung-hsien.hsu@xxxxxxxxxxxx>
> Cc: SHA-cyfmac-dev-list@xxxxxxxxxxxx
> Cc: brcm80211-dev-list.pdl@xxxxxxxxxxxx
> Cc: netdev@xxxxxxxxxxxxxxx
> Cc: linux-wireless@xxxxxxxxxxxxxxx
> Cc: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
> Cc: Jakub Kicinski <kuba@xxxxxxxxxx>
> Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
> Cc: linux-kernel@xxxxxxxxxxxxxxx
> ---
>  drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
> index 9ef94d7a7ca7..d824bea4b79d 100644
> --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
> +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
> @@ -2209,7 +2209,7 @@ static int brcmf_pcie_pm_leave_D3(struct device *dev)
>  
>  	err = brcmf_pcie_probe(pdev, NULL);
>  	if (err)
> -		brcmf_err(bus, "probe after resume failed, err=%d\n", err);
> +		__brcmf_err(NULL, __func__, "probe after resume failed, err=%d\n", err);
>  
>  	return err;
>  }
> 


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