linux-kernel - [PATCH net V2] net: wwan: iosm: Fix error handling path in ipc_pcie

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Date:   Sat,  8 Apr 2023 12:43:21 -0700
From:   Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
To:     m.chetan.kumar@...el.com, linuxwwan@...el.com,
        loic.poulain@...aro.org, ryazanov.s.a@...il.com,
        johannes@...solutions.net, simon.horman@...igine.com
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, error27@...il.com,
        kernel-janitors@...r.kernel.org, vegard.nossum@...cle.com,
        Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
Subject: [PATCH net V2] net: wwan: iosm: Fix error handling path in ipc_pcie_probe()

Smatch reports:
	drivers/net/wwan/iosm/iosm_ipc_pcie.c:298 ipc_pcie_probe()
	warn: missing unwind goto?

When dma_set_mask fails it directly returns without disabling pci
device and freeing ipc_pcie. Fix this my calling a correct goto label

As dma_set_mask returns either 0 or -EIO, we can use a goto label, as
it finally returns -EIO.

Add a set_mask_fail goto label which stands consistent with other goto
labels in this function..

Fixes: 035e3befc191 ("net: wwan: iosm: fix driver not working with INTEL_IOMMU disabled")
Reviewed-by: Simon Horman <simon.horman@...igine.com>
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
---
This is based on static analysis, only compile tested.

v1 --> v2: Address comment by Simon Horman(better goto label name)
---
 drivers/net/wwan/iosm/iosm_ipc_pcie.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wwan/iosm/iosm_ipc_pcie.c b/drivers/net/wwan/iosm/iosm_ipc_pcie.c
index 5bf5a93937c9..04517bd3325a 100644
--- a/drivers/net/wwan/iosm/iosm_ipc_pcie.c
+++ b/drivers/net/wwan/iosm/iosm_ipc_pcie.c
@@ -295,7 +295,7 @@ static int ipc_pcie_probe(struct pci_dev *pci,
 	ret = dma_set_mask(ipc_pcie->dev, DMA_BIT_MASK(64));
 	if (ret) {
 		dev_err(ipc_pcie->dev, "Could not set PCI DMA mask: %d", ret);
-		return ret;
+		goto set_mask_fail;
 	}
 
 	ipc_pcie_config_aspm(ipc_pcie);
@@ -323,6 +323,7 @@ static int ipc_pcie_probe(struct pci_dev *pci,
 imem_init_fail:
 	ipc_pcie_resources_release(ipc_pcie);
 resources_req_fail:
+set_mask_fail:
 	pci_disable_device(pci);
 pci_enable_fail:
 	kfree(ipc_pcie);
-- 
2.38.1