linux-kernel - [PATCH 3/4] fpga: add a platform driver to the FPGA Bridge test suite

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Message-ID: <20230926163911.66114-4-marpagan@redhat.com>
Date:   Tue, 26 Sep 2023 18:39:10 +0200
From:   Marco Pagani <marpagan@...hat.com>
To:     Moritz Fischer <mdf@...nel.org>, Wu Hao <hao.wu@...el.com>,
        Xu Yilun <yilun.xu@...el.com>, Tom Rix <trix@...hat.com>
Cc:     Marco Pagani <marpagan@...hat.com>, linux-kernel@...r.kernel.org,
        linux-fpga@...r.kernel.org, Jinjie Ruan <ruanjinjie@...wei.com>
Subject: [PATCH 3/4] fpga: add a platform driver to the FPGA Bridge test suite

Register a minimal platform driver associated with the parent platform
device used for testing to prevent a null-ptr-deref when try_module_get()
is called by __fpga_bridge_get().

Fixes: 9e6823481e5f ("fpga: add an initial KUnit suite for the FPGA Bridge")
Reported-by: Jinjie Ruan <ruanjinjie@...wei.com>
Signed-off-by: Marco Pagani <marpagan@...hat.com>
---
 drivers/fpga/tests/fpga-bridge-test.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/fpga/tests/fpga-bridge-test.c b/drivers/fpga/tests/fpga-bridge-test.c
index 1d258002cdd7..4bd4ecaa7e90 100644
--- a/drivers/fpga/tests/fpga-bridge-test.c
+++ b/drivers/fpga/tests/fpga-bridge-test.c
@@ -13,6 +13,8 @@
 #include <linux/module.h>
 #include <linux/types.h>
 
+#include "fpga-test-helpers.h"
+
 struct bridge_stats {
 	bool enable;
 };
@@ -53,7 +55,7 @@ static struct bridge_ctx *register_test_bridge(struct kunit *test)
 	ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
 
-	ctx->pdev = platform_device_register_simple("bridge_pdev", PLATFORM_DEVID_AUTO, NULL, 0);
+	ctx->pdev = platform_device_register_simple(TEST_PDEV_NAME, PLATFORM_DEVID_AUTO, NULL, 0);
 	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->pdev);
 
 	ctx->bridge = fpga_bridge_register(&ctx->pdev->dev, "Fake FPGA bridge", &fake_bridge_ops,
@@ -144,6 +146,18 @@ static void fpga_bridge_test_get_put_list(struct kunit *test)
 	unregister_test_bridge(ctx_1);
 }
 
+TEST_PLATFORM_DRIVER(test_platform_driver);
+
+static int fpga_bridge_test_suite_init(struct kunit_suite *suite)
+{
+	return platform_driver_register(&test_platform_driver);
+}
+
+static void fpga_bridge_test_suite_exit(struct kunit_suite *suite)
+{
+	platform_driver_unregister(&test_platform_driver);
+}
+
 static int fpga_bridge_test_init(struct kunit *test)
 {
 	test->priv = register_test_bridge(test);
@@ -165,6 +179,8 @@ static struct kunit_case fpga_bridge_test_cases[] = {
 
 static struct kunit_suite fpga_bridge_suite = {
 	.name = "fpga_bridge",
+	.suite_init = fpga_bridge_test_suite_init,
+	.suite_exit = fpga_bridge_test_suite_exit,
 	.init = fpga_bridge_test_init,
 	.exit = fpga_bridge_test_exit,
 	.test_cases = fpga_bridge_test_cases,
-- 
2.41.0