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authorLinus Torvalds <torvalds@linux-foundation.org>2017-09-15 20:25:06 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-15 20:25:06 -0700
commit8d93c7a4315711ea0f7a95ca353a89c4ed0763fb (patch)
tree256e06d8a485d48f780e311a62e7fdb49f154b91
parent02cfe977e813501ad0e524477eb5cd5b52860448 (diff)
parent0f50a49e3008597abed0fff052d487f77db89093 (diff)
Merge tag 'pci-v4.14-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Pull PCI fix from Bjorn Helgaas: "Revert an attempt to fix a race while enabling upstream bridges because it broke iwlwifi firmware loading" * tag 'pci-v4.14-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: Revert "PCI: Avoid race while enabling upstream bridges"
-rw-r--r--drivers/pci/pci.c13
1 files changed, 2 insertions, 11 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index b0002daa50f3..6078dfc11b11 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -52,7 +52,6 @@ static void pci_pme_list_scan(struct work_struct *work);
static LIST_HEAD(pci_pme_list);
static DEFINE_MUTEX(pci_pme_list_mutex);
static DECLARE_DELAYED_WORK(pci_pme_work, pci_pme_list_scan);
-static DEFINE_MUTEX(pci_bridge_mutex);
struct pci_pme_device {
struct list_head list;
@@ -1351,16 +1350,10 @@ static void pci_enable_bridge(struct pci_dev *dev)
if (bridge)
pci_enable_bridge(bridge);
- /*
- * Hold pci_bridge_mutex to prevent a race when enabling two
- * devices below the bridge simultaneously. The race may cause a
- * PCI_COMMAND_MEMORY update to be lost (see changelog).
- */
- mutex_lock(&pci_bridge_mutex);
if (pci_is_enabled(dev)) {
if (!dev->is_busmaster)
pci_set_master(dev);
- goto end;
+ return;
}
retval = pci_enable_device(dev);
@@ -1368,8 +1361,6 @@ static void pci_enable_bridge(struct pci_dev *dev)
dev_err(&dev->dev, "Error enabling bridge (%d), continuing\n",
retval);
pci_set_master(dev);
-end:
- mutex_unlock(&pci_bridge_mutex);
}
static int pci_enable_device_flags(struct pci_dev *dev, unsigned long flags)
@@ -1394,7 +1385,7 @@ static int pci_enable_device_flags(struct pci_dev *dev, unsigned long flags)
return 0; /* already enabled */
bridge = pci_upstream_bridge(dev);
- if (bridge && !pci_is_enabled(bridge))
+ if (bridge)
pci_enable_bridge(bridge);
/* only skip sriov related */