linux-kernel - [PATCH 4/4] PCI: Remove redundant capabilities checking in pci_{save, restore}_pcie

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Date:	Fri, 01 Jun 2012 15:16:43 -0600
From:	Myron Stowe <myron.stowe@...hat.com>
To:	bhelgaas@...gle.com
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	xudong.hao@...ux.intel.com, ddutile@...hat.com, yu.zhao@...el.com
Subject: [PATCH 4/4] PCI: Remove redundant capabilities checking in pci_{save,
	restore}_pcie_state

Unlike PCI Express v1's Capabilities Structure, v2's requires the entire
structure to be implemented.  In v2 structures, register fields that are
not necessarly implemented, are present but hardwired to 0x0.  These may
include: Link Capabilities, Status, and Control; Slot Capabilities,
Status, and Control; Root Capabilities, Status, and Control; and all of
the '2' (Device, Link, and Slot) Capabilities, Status, and Control
registers.

This patch removes the redundant capability checks corresponding to the
Link 2's and Slot 2's, Capabilities, Status, and Control registers as they
will be present if Device Capabilities 2's registers are (which explains
why the macros for each of the three are identical).

Signed-off-by: Myron Stowe <myron.stowe@...hat.com>
---

 drivers/pci/pci.c |   10 ++++------
 1 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 26933ff..f9f8036 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -903,12 +903,11 @@ static int pci_save_pcie_state(struct pci_dev *dev)
 		pci_read_config_word(dev, pos + PCI_EXP_SLTCTL, &cap[i++]);
 	if (pcie_cap_has_rtctl(dev->pcie_type, flags))
 		pci_read_config_word(dev, pos + PCI_EXP_RTCTL, &cap[i++]);
-	if (pcie_cap_has_devctl2(dev->pcie_type, flags))
+	if (pcie_cap_has_devctl2(dev->pcie_type, flags)) {
 		pci_read_config_word(dev, pos + PCI_EXP_DEVCTL2, &cap[i++]);
-	if (pcie_cap_has_lnkctl2(dev->pcie_type, flags))
 		pci_read_config_word(dev, pos + PCI_EXP_LNKCTL2, &cap[i++]);
-	if (pcie_cap_has_sltctl2(dev->pcie_type, flags))
 		pci_read_config_word(dev, pos + PCI_EXP_SLTCTL2, &cap[i++]);
+	}
 
 	return 0;
 }
@@ -936,12 +935,11 @@ static void pci_restore_pcie_state(struct pci_dev *dev)
 		pci_write_config_word(dev, pos + PCI_EXP_SLTCTL, cap[i++]);
 	if (pcie_cap_has_rtctl(dev->pcie_type, flags))
 		pci_write_config_word(dev, pos + PCI_EXP_RTCTL, cap[i++]);
-	if (pcie_cap_has_devctl2(dev->pcie_type, flags))
+	if (pcie_cap_has_devctl2(dev->pcie_type, flags)) {
 		pci_write_config_word(dev, pos + PCI_EXP_DEVCTL2, cap[i++]);
-	if (pcie_cap_has_lnkctl2(dev->pcie_type, flags))
 		pci_write_config_word(dev, pos + PCI_EXP_LNKCTL2, cap[i++]);
-	if (pcie_cap_has_sltctl2(dev->pcie_type, flags))
 		pci_write_config_word(dev, pos + PCI_EXP_SLTCTL2, cap[i++]);
+	}
 }
 
 

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