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| author | Jiang Liu <jiang.liu@huawei.com> | 2012-06-22 08:55:12 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2012-06-22 23:16:23 +0200 |
| commit | 376f70acfe4bd97493299cdfc00a8d235279d267 (patch) | |
| tree | d01d16dd08be5216c3186e69bcd5f9f0ada415ce /arch/x86/pci/mmconfig-shared.c | |
| parent | x86/PCI: split out pci_mmconfig_alloc() for code reuse (diff) | |
| download | linux-376f70acfe4bd97493299cdfc00a8d235279d267.tar.xz linux-376f70acfe4bd97493299cdfc00a8d235279d267.zip | |
x86/PCI: use RCU list to protect mmconfig list
Use RCU list to protect mmconfig list from dynamic change
when supporting PCI host bridge hotplug.
Reviewed-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jiang Liu <liuj97@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'arch/x86/pci/mmconfig-shared.c')
| -rw-r--r-- | arch/x86/pci/mmconfig-shared.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c index 5e2cd2aa2889..0ac97d54bcac 100644 --- a/arch/x86/pci/mmconfig-shared.c +++ b/arch/x86/pci/mmconfig-shared.c @@ -17,6 +17,8 @@ #include <linux/bitmap.h> #include <linux/dmi.h> #include <linux/slab.h> +#include <linux/mutex.h> +#include <linux/rculist.h> #include <asm/e820.h> #include <asm/pci_x86.h> #include <asm/acpi.h> @@ -25,6 +27,7 @@ /* Indicate if the mmcfg resources have been placed into the resource table. */ static int __initdata pci_mmcfg_resources_inserted; +static DEFINE_MUTEX(pci_mmcfg_lock); LIST_HEAD(pci_mmcfg_list); @@ -45,20 +48,20 @@ static __init void free_all_mmcfg(void) pci_mmconfig_remove(cfg); } -static __init void list_add_sorted(struct pci_mmcfg_region *new) +static __devinit void list_add_sorted(struct pci_mmcfg_region *new) { struct pci_mmcfg_region *cfg; /* keep list sorted by segment and starting bus number */ - list_for_each_entry(cfg, &pci_mmcfg_list, list) { + list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list) { if (cfg->segment > new->segment || (cfg->segment == new->segment && cfg->start_bus >= new->start_bus)) { - list_add_tail(&new->list, &cfg->list); + list_add_tail_rcu(&new->list, &cfg->list); return; } } - list_add_tail(&new->list, &pci_mmcfg_list); + list_add_tail_rcu(&new->list, &pci_mmcfg_list); } static __devinit struct pci_mmcfg_region *pci_mmconfig_alloc(int segment, @@ -101,8 +104,11 @@ static __init struct pci_mmcfg_region *pci_mmconfig_add(int segment, int start, struct pci_mmcfg_region *new; new = pci_mmconfig_alloc(segment, start, end, addr); - if (new) + if (new) { + mutex_lock(&pci_mmcfg_lock); list_add_sorted(new); + mutex_unlock(&pci_mmcfg_lock); + } return new; } @@ -111,7 +117,7 @@ struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus) { struct pci_mmcfg_region *cfg; - list_for_each_entry(cfg, &pci_mmcfg_list, list) + list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list) if (cfg->segment == segment && cfg->start_bus <= bus && bus <= cfg->end_bus) return cfg; |