linux-kernel - [PATCH 2/6] title/pci: use cached pci_dev->pcie

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Date:	Mon, 9 Sep 2013 21:13:04 +0800
From:	Yijing Wang <wangyijing@...wei.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>,
	Chris Metcalf <cmetcalf@...era.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	David Airlie <airlied@...ux.ie>,
	Mike Marciniszyn <infinipath@...el.com>,
	Roland Dreier <roland@...nel.org>,
	Roland Dreier <roland@...estorage.com>
CC:	<linux-kernel@...r.kernel.org>, Mark Einon <mark.einon@...il.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	<linux-rdma@...r.kernel.org>, <linux-pci@...r.kernel.org>,
	Yijing Wang <wangyijing@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>
Subject: [PATCH 2/6] title/pci: use cached pci_dev->pcie_mpss to simplify code

The PCI core caches the "PCI-E Max Payload Size Supported" in
pci_dev->pcie_mpss, so use that instead of pcie_capability_read_dword().

Signed-off-by: Yijing Wang <wangyijing@...wei.com>
---
 arch/tile/kernel/pci.c |    7 ++-----
 1 files changed, 2 insertions(+), 5 deletions(-)

diff --git a/arch/tile/kernel/pci.c b/arch/tile/kernel/pci.c
index 67237d3..692a799 100644
--- a/arch/tile/kernel/pci.c
+++ b/arch/tile/kernel/pci.c
@@ -246,15 +246,12 @@ static void fixup_read_and_payload_sizes(void)
 	/* Scan for the smallest maximum payload size. */
 	for_each_pci_dev(dev) {
 		u32 devcap;
-		int max_payload;
 
 		if (!pci_is_pcie(dev))
 			continue;
 
-		pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &devcap);
-		max_payload = devcap & PCI_EXP_DEVCAP_PAYLOAD;
-		if (max_payload < smallest_max_payload)
-			smallest_max_payload = max_payload;
+		if (dev->pcie_mpss < smallest_max_payload)
+			smallest_max_payload = dev->pcie_mpss;
 	}
 
 	/* Now, set the max_payload_size for all devices to that value. */
-- 
1.7.1


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