linux-kernel - [PATCH 1/3] misc: pci_endpoint_test: Skip IRQ tests if irq is out of range

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Message-ID: <20250804170916.3212221-2-christian.bruel@foss.st.com>
Date: Mon, 4 Aug 2025 19:09:14 +0200
From: Christian Bruel <christian.bruel@...s.st.com>
To: <mani@...nel.org>, <kwilczynski@...nel.org>, <kishon@...nel.org>,
        <arnd@...db.de>, <gregkh@...uxfoundation.org>, <shuah@...nel.org>
CC: <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-kselftest@...r.kernel.org>,
        Christian Bruel
	<christian.bruel@...s.st.com>
Subject: [PATCH 1/3] misc: pci_endpoint_test: Skip IRQ tests if irq is out of range

The pci_endpoint_test tests the 32-bit MSI range. However, the device might
not have all vectors configured. For example, if msi_interrupts is 8 in the
ep function space or if the MSI Multiple Message Capable value is
configured as 4 (maximum 16 vectors).
In this case, do not attempt to run the test to avoid timeouts and directly
return the error value.

Signed-off-by: Christian Bruel <christian.bruel@...s.st.com>
---
 drivers/misc/pci_endpoint_test.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 1c156a3f845e..54f66ece25cd 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -436,7 +436,11 @@ static int pci_endpoint_test_msi_irq(struct pci_endpoint_test *test,
 {
 	struct pci_dev *pdev = test->pdev;
 	u32 val;
-	int ret;
+	int irq;
+
+	irq = pci_irq_vector(pdev, msi_num - 1);
+	if (irq < 0)
+		return irq;
 
 	pci_endpoint_test_writel(test, PCI_ENDPOINT_TEST_IRQ_TYPE,
 				 msix ? PCITEST_IRQ_TYPE_MSIX :
@@ -450,11 +454,7 @@ static int pci_endpoint_test_msi_irq(struct pci_endpoint_test *test,
 	if (!val)
 		return -ETIMEDOUT;
 
-	ret = pci_irq_vector(pdev, msi_num - 1);
-	if (ret < 0)
-		return ret;
-
-	if (ret != test->last_irq)
+	if (irq != test->last_irq)
 		return -EIO;
 
 	return 0;
-- 
2.34.1