kern/156540: commit references a PR

[dfilter service]

The following reply was made to PR kern/156540; it has been noted by GNATS.

From: dfilter at FreeBSD.ORG (dfilter service)
To: bug-followup at FreeBSD.org
Cc:  
Subject: Re: kern/156540: commit references a PR
Date: Sat, 28 Jan 2012 01:39:03 +0000 (UTC)

 Author: emaste
 Date: Sat Jan 28 01:38:48 2012
 New Revision: 230636
 URL: http://svn.freebsd.org/changeset/base/230636
 
 Log:
   pmc_*_initialize may return NULL if the CPU is not supported, so check
   that md is not null before dereferencing it.
   
   PR:		kern/156540
 
 Modified:
   head/sys/dev/hwpmc/hwpmc_x86.c
 
 Modified: head/sys/dev/hwpmc/hwpmc_x86.c
 ==============================================================================
 --- head/sys/dev/hwpmc/hwpmc_x86.c	Sat Jan 28 00:17:17 2012	(r230635)
 +++ head/sys/dev/hwpmc/hwpmc_x86.c	Sat Jan 28 01:38:48 2012	(r230636)
 @@ -250,7 +250,7 @@ pmc_md_initialize()
  		return (NULL);
  
  	/* disallow sampling if we do not have an LAPIC */
 -	if (!lapic_enable_pmc())
 +	if (md != NULL && !lapic_enable_pmc())
  		for (i = 1; i < md->pmd_nclass; i++)
  			md->pmd_classdep[i].pcd_caps &= ~PMC_CAP_INTERRUPT;
  
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