linux-kernel - [PATCH v2 1/2] misc: hpilo: Exclude unsupported device via blacklist

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Message-Id: <1551237930-28823-2-git-send-email-matt.hsiao@hpe.com>
Date:   Wed, 27 Feb 2019 11:25:29 +0800
From:   Matt Hsiao <matt.hsiao@....com>
To:     linux-kernel@...r.kernel.org
Cc:     arnd@...db.de, gregkh@...uxfoundation.org, david.altobelli@....com,
        mark.rusk@....com, jerry.hoemann@....com,
        Matt Hsiao <matt.hsiao@....com>
Subject: [PATCH v2 1/2] misc: hpilo: Exclude unsupported device via blacklist

Instead of having explicit if statements excluding devices,
use a pci_device_id table of devices to blacklist.

HPE will put out minor updates to the iLO using the same device
info except for the subsystem device id. hpilo driver takes the
approach to claim based upon {Vendor, Device, SubVendor} and it
allows old software to work on new hardware without patching.

As our primary way to support our customers is via distros, the
patching process could take months to go upstream and then
backported to multiple releases of multiple distros.

This approach worked fairly well as this is only the second time
in 10+ years that we need to blacklist an instance.

Signed-off-by: Matt Hsiao <matt.hsiao@....com>
---
 drivers/misc/hpilo.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/misc/hpilo.c b/drivers/misc/hpilo.c
index e9c9ef5..0224e50 100644
--- a/drivers/misc/hpilo.c
+++ b/drivers/misc/hpilo.c
@@ -29,6 +29,11 @@
 static unsigned int ilo_major;
 static unsigned int max_ccb = 16;
 static char ilo_hwdev[MAX_ILO_DEV];
+static const struct pci_device_id ilo_blacklist[] = {
+	/* auxiliary iLO */
+	{PCI_DEVICE_SUB(PCI_VENDOR_ID_HP, 0x3307, PCI_VENDOR_ID_HP, 0x1979)},
+	{}
+};

 static inline int get_entry_id(int entry)
 {
@@ -763,9 +768,10 @@ static int ilo_probe(struct pci_dev *pdev,
 	int devnum, minor, start, error = 0;
 	struct ilo_hwinfo *ilo_hw;

-	/* Ignore subsystem_device = 0x1979 (set by BIOS)  */
-	if (pdev->subsystem_device == 0x1979)
-		return 0;
+	if (pci_match_id(ilo_blacklist, pdev)) {
+		dev_dbg(&pdev->dev, "Not supported on this device\n");
+		return -ENODEV;
+	}

 	if (max_ccb > MAX_CCB)
 		max_ccb = MAX_CCB;
-- 
1.8.3.1