[PATCH 4/4] PCI: Remove redundant capabilities checking in pci_{save,restore}_pcie_state

[Myron Stowe]

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@xxxxxxxxxx>
---

 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++]);
+	}
 }
 
 

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/