linux-kernel - [PATCH] brcmfmac: pcie: fix oops on failure to resume and reprobe

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Message-Id: <20210817063521.22450-1-a.fatoum@pengutronix.de>
Date:   Tue, 17 Aug 2021 08:35:22 +0200
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>,
        Hante Meuleman <hante.meuleman@...adcom.com>,
        Chi-hsien Lin <chi-hsien.lin@...ineon.com>,
        Wright Feng <wright.feng@...ineon.com>,
        Chung-hsien Hsu <chung-hsien.hsu@...ineon.com>
Cc:     kernel@...gutronix.de, Ahmad Fatoum <a.fatoum@...gutronix.de>,
        SHA-cyfmac-dev-list@...ineon.com,
        brcm80211-dev-list.pdl@...adcom.com, netdev@...r.kernel.org,
        linux-wireless@...r.kernel.org, Kalle Valo <kvalo@...eaurora.org>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] brcmfmac: pcie: fix oops on failure to resume and reprobe

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.

Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
---
To: Arend van Spriel <aspriel@...il.com>
To: Franky Lin <franky.lin@...adcom.com>
To: Hante Meuleman <hante.meuleman@...adcom.com>
To: Chi-hsien Lin <chi-hsien.lin@...ineon.com>
To: Wright Feng <wright.feng@...ineon.com>
To: Chung-hsien Hsu <chung-hsien.hsu@...ineon.com>
Cc: SHA-cyfmac-dev-list@...ineon.com
Cc: brcm80211-dev-list.pdl@...adcom.com
Cc: netdev@...r.kernel.org
Cc: linux-wireless@...r.kernel.org
Cc: Kalle Valo <kvalo@...eaurora.org>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: linux-kernel@...r.kernel.org
---
 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;
 }
-- 
2.30.2