linux-kernel - [PATCH] intel-iommu: Make "Unknown DMAR structure" message more informative

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Message-ID: <adafxad2oti.fsf@cisco.com>
Date:	Wed, 23 Sep 2009 17:01:29 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	David Woodhouse <David.Woodhouse@...el.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] intel-iommu: Make "Unknown DMAR structure" message more informative

We might as well print the type of the DMAR structure we don't know how
to handle when skipping it.  Then someone getting this message has a
chance of telling whether the structure is just bogus, or if there
really is something valid that the kernel doesn't know how to handle.

Signed-off-by: Roland Dreier <rolandd@...co.com>
---
 drivers/pci/dmar.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index 14bbaa1..d199bca 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -461,7 +461,8 @@ parse_dmar_table(void)
 			break;
 		default:
 			printk(KERN_WARNING PREFIX
-				"Unknown DMAR structure type\n");
+				"Unknown DMAR structure type %d\n",
+				entry_header->type);
 			ret = 0; /* for forward compatibility */
 			break;
 		}
--
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