[PATCH] wifi: brcmfmac: handle possible pci_enable_msi() error

[Dmitry Antipov <dmantipov@xxxxxxxxx>]

Generally it's a good idea to handle error which may be returned from
'pci_enable_msi()', so add relevant check to 'brcmf_pcie_request_irq()'
and adjust the latter to return actual 'request_threaded_irq()' error
instead of hardcoded -EIO. Compile tested only.

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

Signed-off-by: Dmitry Antipov <dmantipov@xxxxxxxxx>
---
 .../broadcom/brcm80211/brcmfmac/pcie.c        | 20 ++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
index e4395b1f8c11..f0e05cb0cfa7 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
@@ -963,6 +963,7 @@ 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);
 
@@ -970,16 +971,21 @@ static int brcmf_pcie_request_irq(struct brcmf_pciedev_info *devinfo)
 
 	brcmf_dbg(PCIE, "Enter\n");
 
-	pci_enable_msi(pdev);
-	if (request_threaded_irq(pdev->irq, brcmf_pcie_quick_check_isr,
-				 brcmf_pcie_isr_thread, IRQF_SHARED,
-				 "brcmf_pcie_intr", devinfo)) {
+	ret = pci_enable_msi(pdev);
+	if (ret)
+		return ret;
+
+	ret = request_threaded_irq(pdev->irq, brcmf_pcie_quick_check_isr,
+				   brcmf_pcie_isr_thread, IRQF_SHARED,
+				   "brcmf_pcie_intr", devinfo);
+	if (ret) {
 		pci_disable_msi(pdev);
 		brcmf_err(bus, "Failed to request IRQ %d\n", pdev->irq);
-		return -EIO;
+	} else {
+		devinfo->irq_allocated = true;
 	}
-	devinfo->irq_allocated = true;
-	return 0;
+
+	return ret;
 }
 
 
-- 
2.47.1