wifi: iwlwifi: add a kunit test for PCI table duplicates

We shouldn't have entries in the table that match the same
device; it's possible to have a specific entry followed by
a less specific entry (i.e. NNNN followed by ANY), but not
entries that are dead, where an earlier entry matches the
same as a later one.

Add a test similar to the existing devinfo test to catch
this situation.

type=feature
ticket=none

Change-Id: I8140d7e9ae52ac50c6830818f8f95ccd0d94b3d3
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Reviewed-on: https://gerritwcs.ir.intel.com/c/iwlwifi-stack-dev/+/96396
automatic-review: iil_jenkins iil_jenkins <EC.GER.UNIX.IIL.JENKINS@INTEL.COM>
tested: iil_jenkins iil_jenkins <EC.GER.UNIX.IIL.JENKINS@INTEL.COM>
Tested-by: iil_jenkins iil_jenkins <EC.GER.UNIX.IIL.JENKINS@INTEL.COM>
Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
x-iwlwifi-stack-dev: 2c9b64ad89d4b6ab751139671a729fb207eaf0f0

4 files changed, 30 insertions, 3 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/iwl-config.h b/drivers/net/wireless/intel/iwlwifi/iwl-config.h
index ca98eea085..d36d3bf764 100644
--- a/drivers/net/wireless/intel/iwlwifi/iwl-config.h
+++ b/drivers/net/wireless/intel/iwlwifi/iwl-config.h
@@ -11,6 +11,7 @@
 #include <linux/netdevice.h>
 #include <linux/ieee80211.h>
 #include <linux/nl80211.h>
+#include <linux/mod_devicetable.h>
 #include "iwl-csr.h"
 #include "iwl-drv.h"
 
@@ -484,6 +485,7 @@ const struct iwl_dev_info *
 iwl_pci_find_dev_info(u16 device, u16 subsystem_device,
 		      u16 mac_type, u8 mac_step, u16 rf_type, u8 cdb,
 		      u8 jacket, u8 rf_id, u8 no_160, u8 cores, u8 rf_step);
+extern const struct pci_device_id iwl_hw_card_ids[];
 #endif
 
 /*
diff --git a/drivers/net/wireless/intel/iwlwifi/pcie/drv.c b/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
index 4b52686aa5..0360553c04 100644
--- a/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
+++ b/drivers/net/wireless/intel/iwlwifi/pcie/drv.c
@@ -33,7 +33,7 @@ extern int _invalid_type;
 	.driver_data = _ASSIGN_CFG(cfg)
 
 /* Hardware specific file defines the PCI IDs table for that hardware module */
-static const struct pci_device_id iwl_hw_card_ids[] = {
+VISIBLE_IF_IWLWIFI_KUNIT const struct pci_device_id iwl_hw_card_ids[] = {
 
 #if IS_ENABLED(CPTCFG_IWLMVM)
 /* 7260 Series */
@@ -330,6 +330,7 @@ static const struct pci_device_id iwl_hw_card_ids[] = {
 	{0}
 };
 MODULE_DEVICE_TABLE(pci, iwl_hw_card_ids);
+EXPORT_SYMBOL_IF_IWLWIFI_KUNIT(iwl_hw_card_ids);
 
 #define _IWL_DEV_INFO(_device, _subdevice, _mac_type, _mac_step, _rf_type, \
 		      _rf_id, _rf_step, _no_160, _cores, _cdb, _cfg, _name) \
diff --git a/drivers/net/wireless/intel/iwlwifi/tests/devinfo.c b/drivers/net/wireless/intel/iwlwifi/tests/devinfo.c
index 7aa47fce6e..7361b6d0cd 100644
--- a/drivers/net/wireless/intel/iwlwifi/tests/devinfo.c
+++ b/drivers/net/wireless/intel/iwlwifi/tests/devinfo.c
@@ -2,9 +2,10 @@
 /*
  * KUnit tests for the iwlwifi device info table
  *
- * Copyright (C) 2023 Intel Corporation
+ * Copyright (C) 2023-2024 Intel Corporation
  */
 #include <kunit/test.h>
+#include <linux/pci.h>
 #include "iwl-drv.h"
 #include "iwl-config.h"
 
@@ -41,8 +42,31 @@ static void devinfo_table_order(struct kunit *test)
 	}
 }
 
+static void devinfo_pci_ids(struct kunit *test)
+{
+	struct pci_dev *dev;
+
+	dev = kunit_kmalloc(test, sizeof(*dev), GFP_KERNEL);
+	KUNIT_ASSERT_NOT_NULL(test, dev);
+
+	for (int i = 0; iwl_hw_card_ids[i].vendor; i++) {
+		const struct pci_device_id *s, *t;
+
+		s = &iwl_hw_card_ids[i];
+		dev->vendor = s->vendor;
+		dev->device = s->device;
+		dev->subsystem_vendor = s->subvendor;
+		dev->subsystem_device = s->subdevice;
+		dev->class = s->class;
+
+		t = pci_match_id(iwl_hw_card_ids, dev);
+		KUNIT_EXPECT_PTR_EQ(test, t, s);
+	}
+}
+
 static struct kunit_case devinfo_test_cases[] = {
 	KUNIT_CASE(devinfo_table_order),
+	KUNIT_CASE(devinfo_pci_ids),
 	{}
 };
 
diff --git a/versions b/versions
index cba844da47..0c2e3878ca 100644
--- a/versions
+++ b/versions
@@ -2,4 +2,4 @@ BACKPORTS_VERSION="(see git)"
 BACKPORTED_KERNEL_VERSION="(see git)"
 BACKPORTED_KERNEL_NAME="iwlwifi"
 BACKPORTS_BUILD_TSTAMP=__DATE__ \" \" __TIME__
-BACKPORTS_GIT_TRACKED="iwlwifi-stack-public:master:11947:f2577e3b"
+BACKPORTS_GIT_TRACKED="iwlwifi-stack-public:master:11948:2c9b64ad"