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author | 2019-07-16 18:12:27 -0400 | |
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committer | 2019-08-13 14:29:22 -0700 | |
commit | 842a56cf3eb00f717f9522766c0e7b71bafd5fc1 (patch) | |
tree | 411253a9f2afc4b39d366062b59e7ee4714b8e3b | |
parent | driver/core: Convert to use built-in RCU list checking (diff) | |
download | linux-842a56cf3eb00f717f9522766c0e7b71bafd5fc1.tar.gz linux-842a56cf3eb00f717f9522766c0e7b71bafd5fc1.tar.bz2 linux-842a56cf3eb00f717f9522766c0e7b71bafd5fc1.zip |
x86/pci: Pass lockdep condition to pcm_mmcfg_list iterator
The pcm_mmcfg_list is traversed by list_for_each_entry_rcu() outside
of an RCU read-side critical section, which is safe because the
pci_mmcfg_lock is held. This commit therefore adds a lockdep expression
to list_for_each_entry_rcu() in order t avoid lockdep warnings.
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
-rw-r--r-- | arch/x86/pci/mmconfig-shared.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c index 7389db538c30..6fa42e9c4e6f 100644 --- a/arch/x86/pci/mmconfig-shared.c +++ b/arch/x86/pci/mmconfig-shared.c @@ -29,6 +29,7 @@ static bool pci_mmcfg_running_state; static bool pci_mmcfg_arch_init_failed; static DEFINE_MUTEX(pci_mmcfg_lock); +#define pci_mmcfg_lock_held() lock_is_held(&(pci_mmcfg_lock).dep_map) LIST_HEAD(pci_mmcfg_list); @@ -54,7 +55,7 @@ static 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_rcu(cfg, &pci_mmcfg_list, list) { + list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list, pci_mmcfg_lock_held()) { if (cfg->segment > new->segment || (cfg->segment == new->segment && cfg->start_bus >= new->start_bus)) { @@ -118,7 +119,7 @@ struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus) { struct pci_mmcfg_region *cfg; - list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list) + list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list, pci_mmcfg_lock_held()) if (cfg->segment == segment && cfg->start_bus <= bus && bus <= cfg->end_bus) return cfg; |