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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Ahmad Fatoum <a.fatoum@pengutronix.de>,
        Kalle Valo <kvalo@codeaurora.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.4 120/144] brcmfmac: pcie: fix oops on failure to resume and reprobe
Date:   Mon, 13 Sep 2021 15:15:01 +0200
Message-Id: <20210913131051.937311398@linuxfoundation.org>
In-Reply-To: <20210913131047.974309396@linuxfoundation.org>
References: <20210913131047.974309396@linuxfoundation.org>
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From: Ahmad Fatoum <a.fatoum@pengutronix.de>

[ Upstream commit d745ca4f2c4ae9f1bd8cf7d8ac6e22d739bffd19 ]

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.

Fixes: 8602e62441ab ("brcmfmac: pass bus to the __brcmf_err() in pcie.c")
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20210817063521.22450-1-a.fatoum@pengutronix.de
Signed-off-by: Sasha Levin <sashal@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 bda042138e96..e6001f0a81a3 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
@@ -2073,7 +2073,7 @@ cleanup:
 
 	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