From: Krystian Lewandowski <krystian.lew@gmail.com>
Date: Wed, 15 Nov 2017 17:29:06 +0000 (+0100)
Subject: pci server crashes during boot on Qubes OS
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/doc/man.7.ps?a=commitdiff_plain;h=b2ee0702ff8e8e556f7fe39b81f43e413070dc59;p=minix.git

pci server crashes during boot on Qubes OS

I tried to launch Minix3 in Qubes OS. While there is no problem to boot
minix as a qube (in Qubes OS terminology) before 3641562, it fails with
the commit (and after). I didn't digg into PCI handling but this change
fixes the problem. Minix handles NULL case from pci_subclass_name.

Change-Id: I162424d92b613598e6eb845a71f90a02e31041db
---

diff --git a/sys/dev/pci/pci_subr.c b/sys/dev/pci/pci_subr.c
index 65372632f..462fd5672 100644
--- a/sys/dev/pci/pci_subr.c
+++ b/sys/dev/pci/pci_subr.c
@@ -617,7 +617,11 @@ pci_subclass_name(pcireg_t reg)
 		subclassp++;
 	}
 
-	return subclassp->name;
+	if (subclassp) {
+		return subclassp->name;
+	} else {
+		return NULL;
+	}
 }
 #endif /* defined(__minix) && defined(_PCI_SERVER) */