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Message-ID: <20150709060420.GA7465@richard>
Date: Thu, 9 Jul 2015 14:04:21 +0800
From: Wei Yang <weiyang@...ux.vnet.ibm.com>
To: Yinghai Lu <yinghai@...nel.org>
Cc: Wei Yang <weiyang@...ux.vnet.ibm.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
David Miller <davem@...emloft.net>,
David Ahern <david.ahern@...cle.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
TJ <linux@....tj>, Yijing Wang <wangyijing@...wei.com>,
Andrew Morton <akpm@...ux-foundation.org>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 36/36] PCI: Don't set flags to 0 when assign resource fail
This one is on top of the last one ? or replace the last one?
On Wed, Jul 08, 2015 at 10:01:47PM -0700, Yinghai Lu wrote:
>On Wed, Jul 8, 2015 at 8:30 PM, Wei Yang <weiyang@...ux.vnet.ibm.com> wrote:
>> Hi, Yinghai
>>
>> This patch may introduce some problem.
>>
>> On my P8 machine, after applying this patch, I see following error:
>>
>> [ 0.589948] pnv_ioda_setup_pe_seg: trigger IO SEG 0
>> [ 0.589992] pnv_ioda_setup_pe_seg: res[io 0x1000-0x3fff] 100
>>
>> The last 0x100 is the res->flags, which indicates the UNSET and DISABLED bit
>> is not set.
>
>Maybe we should introduce resource_disabled() for that.
>
>Please check if attached patch would fix the problem.
>
>Thanks
>
>Yinghai
>Subject: [PATCH] PCI: Introduce resource_disabled()
>
>so we can cover !flags and IORESOURCE_DISABLED both.
>
>Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>
>diff --git a/arch/alpha/kernel/pci.c b/arch/alpha/kernel/pci.c
>index 82f738e..91a7153 100644
>--- a/arch/alpha/kernel/pci.c
>+++ b/arch/alpha/kernel/pci.c
>@@ -282,7 +282,7 @@ pcibios_claim_one_bus(struct pci_bus *b)
> for (i = 0; i < PCI_NUM_RESOURCES; i++) {
> struct resource *r = &dev->resource[i];
>
>- if (r->parent || !r->start || !r->flags)
>+ if (r->parent || !r->start || resource_disabled(r))
> continue;
> if (pci_has_flag(PCI_PROBE_ONLY) ||
> (r->flags & IORESOURCE_PCI_FIXED)) {
>diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
>index 7cc3be9..cc293ea 100644
>--- a/arch/ia64/pci/pci.c
>+++ b/arch/ia64/pci/pci.c
>@@ -501,7 +501,7 @@ void pcibios_fixup_device_resources(struct pci_dev *dev)
> for (idx = 0; idx < PCI_BRIDGE_RESOURCES; idx++) {
> struct resource *r = &dev->resource[idx];
>
>- if (!r->flags || r->parent || !r->start)
>+ if (resource_disabled(r) || r->parent || !r->start)
> continue;
>
> pci_claim_resource(dev, idx);
>@@ -519,7 +519,7 @@ static void pcibios_fixup_bridge_resources(struct pci_dev *dev)
> for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_NUM_RESOURCES; idx++) {
> struct resource *r = &dev->resource[idx];
>
>- if (!r->flags || r->parent || !r->start)
>+ if (resource_disabled(r) || r->parent || !r->start)
> continue;
>
> pci_claim_bridge_resource(dev, idx);
>diff --git a/arch/microblaze/pci/pci-common.c b/arch/microblaze/pci/pci-common.c
>index ae838ed..67848f8 100644
>--- a/arch/microblaze/pci/pci-common.c
>+++ b/arch/microblaze/pci/pci-common.c
>@@ -705,7 +705,7 @@ static void pcibios_fixup_resources(struct pci_dev *dev)
> }
> for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
> struct resource *res = dev->resource + i;
>- if (!res->flags)
>+ if (resource_disabled(res))
> continue;
> if (res->start == 0) {
> pr_debug("PCI:%s Resource %d %016llx-%016llx [%x]",
>@@ -806,7 +806,7 @@ static void pcibios_fixup_bridge(struct pci_bus *bus)
> pci_bus_for_each_resource(bus, res, i) {
> if (!res)
> continue;
>- if (!res->flags)
>+ if (resource_disabled(res))
> continue;
> if (i >= 3 && bus->self->transparent)
> continue;
>@@ -993,7 +993,7 @@ static void pcibios_allocate_bus_resources(struct pci_bus *bus)
> pci_domain_nr(bus), bus->number);
>
> pci_bus_for_each_resource(bus, res, i) {
>- if (!res || !res->flags
>+ if (!res || resource_disabled(res)
> || res->start > res->end || res->parent)
> continue;
> if (bus->parent == NULL)
>@@ -1095,7 +1095,8 @@ static void __init pcibios_allocate_resources(int pass)
> r = &dev->resource[idx];
> if (r->parent) /* Already allocated */
> continue;
>- if (!r->flags || (r->flags & IORESOURCE_UNSET))
>+ if (resource_disabled(r) ||
>+ (r->flags & IORESOURCE_UNSET))
> continue; /* Not assigned at all */
> /* We only allocate ROMs on pass 1 just in case they
> * have been screwed up by firmware
>@@ -1226,7 +1227,7 @@ void pcibios_claim_one_bus(struct pci_bus *bus)
> for (i = 0; i < PCI_NUM_RESOURCES; i++) {
> struct resource *r = &dev->resource[i];
>
>- if (r->parent || !r->start || !r->flags)
>+ if (r->parent || !r->start || resource_disabled(r))
> continue;
>
> pr_debug("PCI: Claiming %s: ", pci_name(dev));
>@@ -1286,7 +1287,7 @@ static void pcibios_setup_phb_resources(struct pci_controller *hose,
> res->start = (res->start + io_offset) & 0xffffffffu;
> res->end = (res->end + io_offset) & 0xffffffffu;
>
>- if (!res->flags) {
>+ if (resource_disabled(res)) {
> pr_warn("PCI: I/O resource not set for host ");
> pr_cont("bridge %s (domain %d)\n",
> hose->dn->full_name, hose->global_number);
>@@ -1306,7 +1307,7 @@ static void pcibios_setup_phb_resources(struct pci_controller *hose,
> /* Hookup PHB Memory resources */
> for (i = 0; i < 3; ++i) {
> res = &hose->mem_resources[i];
>- if (!res->flags) {
>+ if (resource_disabled(res)) {
> if (i > 0)
> continue;
> pr_err("PCI: Memory resource 0 not set for ");
>diff --git a/arch/mn10300/unit-asb2305/pci-asb2305.c b/arch/mn10300/unit-asb2305/pci-asb2305.c
>index b5b036f..a249821 100644
>--- a/arch/mn10300/unit-asb2305/pci-asb2305.c
>+++ b/arch/mn10300/unit-asb2305/pci-asb2305.c
>@@ -103,7 +103,7 @@ static void __init pcibios_allocate_bus_resources(struct list_head *bus_list)
> idx < PCI_NUM_RESOURCES;
> idx++) {
> r = &dev->resource[idx];
>- if (!r->flags)
>+ if (resource_disabled(r))
> continue;
> if (!r->start ||
> pci_claim_bridge_resource(dev, idx) < 0) {
>@@ -189,7 +189,7 @@ static int __init pcibios_assign_resources(void)
> addresses. */
> for_each_pci_dev(dev) {
> r = &dev->resource[PCI_ROM_RESOURCE];
>- if (!r->flags || !r->start)
>+ if (resource_disabled(r) || !r->start)
> continue;
> if (pci_claim_resource(dev, PCI_ROM_RESOURCE) < 0) {
> r->end -= r->start;
>diff --git a/arch/mn10300/unit-asb2305/pci.c b/arch/mn10300/unit-asb2305/pci.c
>index 3dfe2d3..ad77b18 100644
>--- a/arch/mn10300/unit-asb2305/pci.c
>+++ b/arch/mn10300/unit-asb2305/pci.c
>@@ -291,7 +291,7 @@ static void pcibios_fixup_device_resources(struct pci_dev *dev)
> for (idx = 0; idx < PCI_BRIDGE_RESOURCES; idx++) {
> struct resource *r = &dev->resource[idx];
>
>- if (!r->flags || r->parent || !r->start)
>+ if (resource_disabled(r) || r->parent || !r->start)
> continue;
>
> pci_claim_resource(dev, idx);
>@@ -308,7 +308,7 @@ static void pcibios_fixup_bridge_resources(struct pci_dev *dev)
> for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_NUM_RESOURCES; idx++) {
> struct resource *r = &dev->resource[idx];
>
>- if (!r->flags || r->parent || !r->start)
>+ if (resource_disabled(r) || r->parent || !r->start)
> continue;
>
> pci_claim_bridge_resource(dev, idx);
>diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
>index b9de34d..140106d 100644
>--- a/arch/powerpc/kernel/pci-common.c
>+++ b/arch/powerpc/kernel/pci-common.c
>@@ -810,7 +810,7 @@ static void pcibios_fixup_resources(struct pci_dev *dev)
> for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
> struct resource *res = dev->resource + i;
> struct pci_bus_region reg;
>- if (!res->flags)
>+ if (resource_disabled(res))
> continue;
>
> /* If we're going to re-assign everything, we mark all resources
>@@ -927,7 +927,7 @@ static void pcibios_fixup_bridge(struct pci_bus *bus)
> struct pci_dev *dev = bus->self;
>
> pci_bus_for_each_resource(bus, res, i) {
>- if (!res || !res->flags)
>+ if (!res || resource_disabled(res))
> continue;
> if (i >= 3 && bus->self->transparent)
> continue;
>@@ -1183,7 +1183,8 @@ static void pcibios_allocate_bus_resources(struct pci_bus *bus)
> pci_domain_nr(bus), bus->number);
>
> pci_bus_for_each_resource(bus, res, i) {
>- if (!res || !res->flags || res->start > res->end || res->parent)
>+ if (!res || resource_disabled(res) ||
>+ res->start > res->end || res->parent)
> continue;
>
> /* If the resource was left unset at this point, we clear it */
>@@ -1290,7 +1291,8 @@ static void __init pcibios_allocate_resources(int pass)
> r = &dev->resource[idx];
> if (r->parent) /* Already allocated */
> continue;
>- if (!r->flags || (r->flags & IORESOURCE_UNSET))
>+ if (resource_disabled(r) ||
>+ (r->flags & IORESOURCE_UNSET))
> continue; /* Not assigned at all */
> /* We only allocate ROMs on pass 1 just in case they
> * have been screwed up by firmware
>@@ -1428,7 +1430,7 @@ void pcibios_claim_one_bus(struct pci_bus *bus)
> for (i = 0; i < PCI_NUM_RESOURCES; i++) {
> struct resource *r = &dev->resource[i];
>
>- if (r->parent || !r->start || !r->flags)
>+ if (r->parent || !r->start || resource_disabled(r))
> continue;
>
> pr_debug("PCI: Claiming %s: "
>@@ -1513,7 +1515,7 @@ static void pcibios_setup_phb_resources(struct pci_controller *hose,
> /* Hookup PHB IO resource */
> res = &hose->io_resource;
>
>- if (!res->flags) {
>+ if (resource_disabled(res)) {
> pr_info("PCI: I/O resource not set for host"
> " bridge %s (domain %d)\n",
> hose->dn->full_name, hose->global_number);
>@@ -1531,7 +1533,7 @@ static void pcibios_setup_phb_resources(struct pci_controller *hose,
> /* Hookup PHB Memory resources */
> for (i = 0; i < 3; ++i) {
> res = &hose->mem_resources[i];
>- if (!res->flags) {
>+ if (resource_disabled(res)) {
> if (i == 0)
> printk(KERN_ERR "PCI: Memory resource 0 not set for "
> "host bridge %s (domain %d)\n",
>diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
>index 5738d31..9c42f52 100644
>--- a/arch/powerpc/platforms/powernv/pci-ioda.c
>+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
>@@ -905,7 +905,7 @@ static int pnv_pci_vf_resource_shift(struct pci_dev *dev, int offset)
> num_vfs = pdn->num_vfs;
> for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
> res = &dev->resource[i + PCI_IOV_RESOURCES];
>- if (!res->flags || !res->parent)
>+ if (resource_disabled(res) || !res->parent)
> continue;
>
> if (!pnv_pci_is_mem_pref_64(res->flags))
>@@ -936,7 +936,7 @@ static int pnv_pci_vf_resource_shift(struct pci_dev *dev, int offset)
> */
> for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
> res = &dev->resource[i + PCI_IOV_RESOURCES];
>- if (!res->flags || !res->parent)
>+ if (resource_disabled(res) || !res->parent)
> continue;
>
> if (!pnv_pci_is_mem_pref_64(res->flags))
>@@ -1218,7 +1218,7 @@ static int pnv_pci_vf_assign_m64(struct pci_dev *pdev, u16 num_vfs)
>
> for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
> res = &pdev->resource[i + PCI_IOV_RESOURCES];
>- if (!res->flags || !res->parent)
>+ if (resource_disabled(res) || !res->parent)
> continue;
>
> if (!pnv_pci_is_mem_pref_64(res->flags))
>@@ -2771,7 +2771,7 @@ static void pnv_pci_ioda_fixup_iov_resources(struct pci_dev *pdev)
>
> for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
> res = &pdev->resource[i + PCI_IOV_RESOURCES];
>- if (!res->flags || res->parent)
>+ if (resource_disabled(res) || res->parent)
> continue;
> if (!pnv_pci_is_mem_pref_64(res->flags)) {
> dev_warn(&pdev->dev, " non M64 VF BAR%d: %pR\n",
>@@ -2793,7 +2793,7 @@ static void pnv_pci_ioda_fixup_iov_resources(struct pci_dev *pdev)
>
> for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
> res = &pdev->resource[i + PCI_IOV_RESOURCES];
>- if (!res->flags || res->parent)
>+ if (resource_disabled(res) || res->parent)
> continue;
> if (!pnv_pci_is_mem_pref_64(res->flags)) {
> dev_warn(&pdev->dev, "Skipping expanding VF BAR%d: %pR\n",
>@@ -2834,7 +2834,7 @@ static void pnv_ioda_setup_pe_seg(struct pci_controller *hose,
> BUG_ON(!(pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL)));
>
> pci_bus_for_each_resource(pe->pbus, res, i) {
>- if (!res || !res->flags ||
>+ if (!res || resource_disabled(res) ||
> res->start > res->end)
> continue;
>
>diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
>index 598f023..d850749 100644
>--- a/arch/s390/pci/pci.c
>+++ b/arch/s390/pci/pci.c
>@@ -658,7 +658,7 @@ int pcibios_add_device(struct pci_dev *pdev)
>
> for (i = 0; i < PCI_BAR_COUNT; i++) {
> res = &pdev->resource[i];
>- if (res->parent || !res->flags)
>+ if (res->parent || resource_disabled(res))
> continue;
> pci_claim_resource(pdev, i);
> }
>diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c
>index bfd0b70..f5e9536 100644
>--- a/arch/sparc/kernel/pci.c
>+++ b/arch/sparc/kernel/pci.c
>@@ -630,7 +630,7 @@ static void pci_claim_bus_resources(struct pci_bus *bus)
> for (i = 0; i < PCI_NUM_RESOURCES; i++) {
> struct resource *r = &dev->resource[i];
>
>- if (r->parent || !r->start || !r->flags)
>+ if (r->parent || !r->start || resource_disabled(r))
> continue;
>
> if (ofpci_verbose)
>diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
>index d4718d4..7feee46 100644
>--- a/arch/x86/pci/i386.c
>+++ b/arch/x86/pci/i386.c
>@@ -212,7 +212,7 @@ static void pcibios_allocate_bridge_resources(struct pci_dev *dev)
>
> for (idx = PCI_BRIDGE_RESOURCES; idx < PCI_NUM_RESOURCES; idx++) {
> r = &dev->resource[idx];
>- if (!r->flags)
>+ if (resource_disabled(r))
> continue;
> if (r->parent) /* Already allocated */
> continue;
>@@ -341,7 +341,7 @@ static void pcibios_allocate_dev_rom_resource(struct pci_dev *dev)
> * addresses.
> */
> r = &dev->resource[PCI_ROM_RESOURCE];
>- if (!r->flags || !r->start)
>+ if (resource_disabled(r) || !r->start)
> return;
> if (r->parent) /* Already allocated */
> return;
>diff --git a/arch/xtensa/kernel/pci.c b/arch/xtensa/kernel/pci.c
>index b848cc3..f34d061 100644
>--- a/arch/xtensa/kernel/pci.c
>+++ b/arch/xtensa/kernel/pci.c
>@@ -142,7 +142,7 @@ static void __init pci_controller_apertures(struct pci_controller *pci_ctrl,
>
> io_offset = (unsigned long)pci_ctrl->io_space.base;
> res = &pci_ctrl->io_resource;
>- if (!res->flags) {
>+ if (resource_disabled(res)) {
> if (io_offset)
> printk (KERN_ERR "I/O resource not set for host"
> " bridge %d\n", pci_ctrl->index);
>@@ -156,7 +156,7 @@ static void __init pci_controller_apertures(struct pci_controller *pci_ctrl,
>
> for (i = 0; i < 3; i++) {
> res = &pci_ctrl->mem_resources[i];
>- if (!res->flags) {
>+ if (resource_disabled(res)) {
> if (i > 0)
> continue;
> printk(KERN_ERR "Memory resource not set for "
>diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
>index a98a7b2..de7788b 100644
>--- a/drivers/iommu/intel-iommu.c
>+++ b/drivers/iommu/intel-iommu.c
>@@ -1743,7 +1743,8 @@ static int dmar_init_reserved_ranges(void)
>
> for (i = 0; i < PCI_NUM_RESOURCES; i++) {
> r = &pdev->resource[i];
>- if (!r->flags || !(r->flags & IORESOURCE_MEM))
>+ if (resource_disabled(r) ||
>+ !(r->flags & IORESOURCE_MEM))
> continue;
> iova = reserve_iova(&reserved_iova_list,
> IOVA_PFN(r->start),
>diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c
>index c086210..a6d6bd0 100644
>--- a/drivers/pci/host/pcie-rcar.c
>+++ b/drivers/pci/host/pcie-rcar.c
>@@ -365,7 +365,7 @@ static int rcar_pcie_setup(int nr, struct pci_sys_data *sys)
> for (i = 0; i < RCAR_PCI_MAX_RESOURCES; i++) {
>
> res = &pcie->res[i];
>- if (!res->flags)
>+ if (resource_disabled(res))
> continue;
>
> rcar_pcie_setup_window(i, pcie);
>diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
>index ee0ebff..808d08b 100644
>--- a/drivers/pci/iov.c
>+++ b/drivers/pci/iov.c
>@@ -438,7 +438,7 @@ found:
> res = &dev->resource[i + PCI_IOV_RESOURCES];
> bar64 = __pci_read_base(dev, pci_bar_unknown, res,
> pos + PCI_SRIOV_BAR + i * 4);
>- if (!res->flags)
>+ if (resource_disabled(res))
> continue;
> if (resource_size(res) & (PAGE_SIZE - 1)) {
> rc = -EIO;
>diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
>index 14bdbca..5440fb1 100644
>--- a/drivers/pci/probe.c
>+++ b/drivers/pci/probe.c
>@@ -2129,7 +2129,7 @@ void pci_bus_release_busn_res(struct pci_bus *b)
> struct resource *res = &b->busn_res;
> int ret;
>
>- if (!res->flags || !res->parent)
>+ if (resource_disabled(res) || !res->parent)
> return;
>
> ret = release_resource(res);
>diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
>index 184a09e..1d6ae73 100644
>--- a/drivers/pci/quirks.c
>+++ b/drivers/pci/quirks.c
>@@ -337,7 +337,7 @@ static void quirk_bar_fixed(struct pci_dev *dev)
> for (i = 0; i < PCI_STD_RESOURCE_END; i++) {
> struct resource *r = &dev->resource[i];
>
>- if (!r->flags || r->flags & IORESOURCE_UNSET)
>+ if (resource_disabled(r) || r->flags & IORESOURCE_UNSET)
> continue;
> r->flags |= IORESOURCE_PCI_FIXED;
> }
>diff --git a/drivers/pci/rom.c b/drivers/pci/rom.c
>index eb0ad53..585a9d3 100644
>--- a/drivers/pci/rom.c
>+++ b/drivers/pci/rom.c
>@@ -28,7 +28,7 @@ int pci_enable_rom(struct pci_dev *pdev)
> struct pci_bus_region region;
> u32 rom_addr;
>
>- if (!res->flags)
>+ if (resource_disabled(res))
> return -1;
>
> pcibios_resource_to_bus(pdev->bus, ®ion, res);
>diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
>index 04fc2e0..9197c97 100644
>--- a/drivers/pci/setup-bus.c
>+++ b/drivers/pci/setup-bus.c
>@@ -260,8 +260,7 @@ static void pdev_check_resources(struct pci_dev *dev,
> if (r->flags & IORESOURCE_PCI_FIXED)
> continue;
>
>- if (!r->flags || r->parent ||
>- (r->flags & IORESOURCE_DISABLED))
>+ if (resource_disabled(r) || r->parent)
> continue;
>
> r_align = __pci_resource_alignment(dev, r, realloc_head);
>@@ -2088,7 +2087,7 @@ static void pci_bus_dump_res(struct pci_bus *bus)
> int i;
>
> pci_bus_for_each_resource(bus, res, i) {
>- if (!res || !res->end || !res->flags)
>+ if (!res || !res->end || resource_disabled(res))
> continue;
>
> dev_printk(KERN_DEBUG, &bus->dev, "resource %d %pR\n", i, res);
>@@ -2171,7 +2170,7 @@ static int iov_resources_unassigned(struct pci_dev *dev, void *data)
> struct pci_bus_region region;
>
> /* Not assigned or rejected by kernel? */
>- if (!r->flags)
>+ if (resource_disabled(r))
> continue;
>
> pcibios_resource_to_bus(dev->bus, ®ion, r);
>diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
>index 2a5cddc..070d6d2 100644
>--- a/drivers/pci/setup-res.c
>+++ b/drivers/pci/setup-res.c
>@@ -40,7 +40,7 @@ void pci_update_resource(struct pci_dev *dev, int resno)
> * Ignore resources for unimplemented BARs and unused resource slots
> * for 64 bit BARs.
> */
>- if (!res->flags)
>+ if (resource_disabled(res))
> return;
>
> if (res->flags & IORESOURCE_UNSET)
>diff --git a/include/linux/ioport.h b/include/linux/ioport.h
>index 27dbb18..fb21179 100644
>--- a/include/linux/ioport.h
>+++ b/include/linux/ioport.h
>@@ -179,6 +179,10 @@ static inline bool resource_contains(struct resource *r1, struct resource *r2)
> return r1->start <= r2->start && r1->end >= r2->end;
> }
>
>+static inline bool resource_disabled(struct resource *r)
>+{
>+ return !r->flags || (r->flags & IORESOURCE_DISABLED);
>+}
>
> /* Convenience shorthand with allocation */
> #define request_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name), 0)
--
Richard Yang
Help you, Help me
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