linux-kernel - [PATCH v2 1/5] misc: pci_endpoint_test: Avoid using module parameter to determine irqtype

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Message-ID: <20200317100158.4692-2-kishon@ti.com>
Date:   Tue, 17 Mar 2020 15:31:54 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>
CC:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        <stable@...r.kernel.org>
Subject: [PATCH v2 1/5] misc: pci_endpoint_test: Avoid using module parameter to determine irqtype

commit e03327122e2c ("pci_endpoint_test: Add 2 ioctl commands")
uses module parameter 'irqtype' in pci_endpoint_test_set_irq()
to check if irq vectors of a particular type (MSI or MSI-X or
LEGACY) is already allocated. However with multi-function devices,
'irqtype' will not correctly reflect the irq type of the PCI device.
Fix it here by adding 'irqtype' for each PCI device to show the
irq type of a particular PCI device.

Fixes: e03327122e2c ("pci_endpoint_test: Add 2 ioctl commands")
Cc: stable@...r.kernel.org # v4.19+
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/misc/pci_endpoint_test.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 8682867ac14a..ca680635d7a9 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -103,6 +103,7 @@ struct pci_endpoint_test {
 	struct completion irq_raised;
 	int		last_irq;
 	int		num_irqs;
+	int		irq_type;
 	/* mutex to protect the ioctls */
 	struct mutex	mutex;
 	struct miscdevice miscdev;
@@ -162,6 +163,7 @@ static void pci_endpoint_test_free_irq_vectors(struct pci_endpoint_test *test)
 	struct pci_dev *pdev = test->pdev;
 
 	pci_free_irq_vectors(pdev);
+	test->irq_type = IRQ_TYPE_UNDEFINED;
 }
 
 static bool pci_endpoint_test_alloc_irq_vectors(struct pci_endpoint_test *test,
@@ -196,6 +198,8 @@ static bool pci_endpoint_test_alloc_irq_vectors(struct pci_endpoint_test *test,
 		irq = 0;
 		res = false;
 	}
+
+	test->irq_type = type;
 	test->num_irqs = irq;
 
 	return res;
@@ -340,6 +344,7 @@ static bool pci_endpoint_test_copy(struct pci_endpoint_test *test,
 	dma_addr_t orig_dst_phys_addr;
 	size_t offset;
 	size_t alignment = test->alignment;
+	int irq_type = test->irq_type;
 	u32 src_crc32;
 	u32 dst_crc32;
 	int err;
@@ -473,6 +478,7 @@ static bool pci_endpoint_test_write(struct pci_endpoint_test *test,
 	dma_addr_t orig_phys_addr;
 	size_t offset;
 	size_t alignment = test->alignment;
+	int irq_type = test->irq_type;
 	size_t size;
 	u32 crc32;
 	int err;
@@ -571,6 +577,7 @@ static bool pci_endpoint_test_read(struct pci_endpoint_test *test,
 	dma_addr_t orig_phys_addr;
 	size_t offset;
 	size_t alignment = test->alignment;
+	int irq_type = test->irq_type;
 	u32 crc32;
 	int err;
 
@@ -656,7 +663,7 @@ static bool pci_endpoint_test_set_irq(struct pci_endpoint_test *test,
 		return false;
 	}
 
-	if (irq_type == req_irq_type)
+	if (test->irq_type == req_irq_type)
 		return true;
 
 	pci_endpoint_test_release_irq(test);
@@ -668,12 +675,10 @@ static bool pci_endpoint_test_set_irq(struct pci_endpoint_test *test,
 	if (!pci_endpoint_test_request_irq(test))
 		goto err;
 
-	irq_type = req_irq_type;
 	return true;
 
 err:
 	pci_endpoint_test_free_irq_vectors(test);
-	irq_type = IRQ_TYPE_UNDEFINED;
 	return false;
 }
 
@@ -753,6 +758,7 @@ static int pci_endpoint_test_probe(struct pci_dev *pdev,
 	test->test_reg_bar = 0;
 	test->alignment = 0;
 	test->pdev = pdev;
+	test->irq_type = IRQ_TYPE_UNDEFINED;
 
 	if (no_msi)
 		irq_type = IRQ_TYPE_LEGACY;
-- 
2.17.1