linux-kernel - [PATCH 1/1] PCI: Handle case when no pci device can provide cache line size hint

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Message-ID: <20091215122525.GA21846@foogalware.zresearch.com>
Date:	Tue, 15 Dec 2009 17:55:25 +0530
From:	Csaba Henk <csaba@...ster.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/1] PCI: Handle case when no pci device can provide cache
 line size hint

Prior to this patch, if pci_read_config_byte(dev, PCI_CACHE_LINE_SIZE, ...)
returns 0 for all dev, pci_cache_line_size ends up set to zero
(instead of pci_dfl_cache_line_size).

This patch ensures the pci_cache_line_size = pci_dfl_cache_line_size
setting in the above scenario.

This happens in case of a kvm-88 guest (where, consequently, the rtl8139
NIC failed to initialize).

Signed-off-by: Csaba Henk <csaba@...ster.com>
---
 drivers/pci/quirks.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 7cfa7c3..f70f4e2 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -2629,7 +2629,7 @@ static int __init pci_apply_final_quirks(void)
 	if (!pci_cache_line_size) {
 		printk(KERN_DEBUG "PCI: CLS %u bytes, default %u\n",
 		       cls << 2, pci_dfl_cache_line_size << 2);
-		pci_cache_line_size = cls;
+		pci_cache_line_size = cls ? cls : pci_dfl_cache_line_size;
 	}
 
 	return 0;
-- 
1.6.5.6

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