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pci-v4.14-fixes-1 

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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"
This commit is contained in:
Linus Torvalds 2017-09-15 20:25:06 -07:00
parent 02cfe977e8 0f50a49e30
commit 8d93c7a431
1 changed files with 2 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/pci/pci.c
View File

@ -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 */