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From:   Dmitry Antipov <dmantipov@yandex.ru>
To:     Franky Lin <franky.lin@broadcom.com>
Cc:     brcm80211-dev-list.pdl@broadcom.com,
        linux-wireless@vger.kernel.org, Kalle Valo <kvalo@kernel.org>,
        lvc-project@linuxtesting.org, Dmitry Antipov <dmantipov@yandex.ru>
Subject: [PATCH 3/3] wifi: brcmfmac: handle possible MSI enabling error
Date:   Wed,  7 Jun 2023 19:16:10 +0300
Message-Id: <20230607161611.85106-3-dmantipov@yandex.ru>
In-Reply-To: <20230607161611.85106-1-dmantipov@yandex.ru>
References: <20230607161611.85106-1-dmantipov@yandex.ru>
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Handle possible 'pci_enable_msi()' error in
'brcmf_pcie_request_irq()', adjust related code.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
---
 .../net/wireless/broadcom/brcm80211/brcmfmac/pcie.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
index 80220685f5e4..4d61f241cfaf 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
@@ -965,6 +965,7 @@ static irqreturn_t brcmf_pcie_isr_thread(int irq, void *arg)
 
 static int brcmf_pcie_request_irq(struct brcmf_pciedev_info *devinfo)
 {
+	int ret;
 	struct pci_dev *pdev = devinfo->pdev;
 	struct brcmf_bus *bus = dev_get_drvdata(&pdev->dev);
 
@@ -972,16 +973,20 @@ static int brcmf_pcie_request_irq(struct brcmf_pciedev_info *devinfo)
 
 	brcmf_dbg(PCIE, "Enter\n");
 
-	pci_enable_msi(pdev);
+	ret = pci_enable_msi(pdev);
+	if (ret)
+		return ret;
 	if (request_threaded_irq(pdev->irq, brcmf_pcie_quick_check_isr,
 				 brcmf_pcie_isr_thread, IRQF_SHARED,
 				 "brcmf_pcie_intr", devinfo)) {
 		pci_disable_msi(pdev);
 		brcmf_err(bus, "Failed to request IRQ %d\n", pdev->irq);
-		return -EIO;
+		ret = -EIO;
+	} else {
+		devinfo->irq_allocated = true;
+		ret = 0;
 	}
-	devinfo->irq_allocated = true;
-	return 0;
+	return ret;
 }
 
 
-- 
2.40.1