From: Yanir Lubetkin <yanirx.lubet...@intel.com>
e1000e_disable_aspm called pci_disable_link_state_locked which requires
pci_bus_sem to be held, but is also called from places where this semaphore
was not previously acquired. This patch implements two flavors of
disable_aspm, one that acquires the lock, and the other (_locked) which
should be called when the semaphore is already acquired.
Signed-off-by: Yanir Lubetkin <yanirx.lubet...@intel.com>
Tested-by: Aaron Brown <aaron.f.br...@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirs...@intel.com>
---
drivers/net/ethernet/intel/e1000e/netdev.c | 38 ++++++++++++++++++++++++++----
1 file changed, 34 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c
b/drivers/net/ethernet/intel/e1000e/netdev.c
index e62b9dc..89d788d 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -6354,13 +6354,14 @@ static int __e1000_shutdown(struct pci_dev *pdev, bool
runtime)
}
/**
- * e1000e_disable_aspm - Disable ASPM states
+ * __e1000e_disable_aspm - Disable ASPM states
* @pdev: pointer to PCI device struct
* @state: bit-mask of ASPM states to disable
+ * @locked: indication if this context holds pci_bus_sem locked.
*
* Some devices *must* have certain ASPM states disabled per hardware errata.
**/
-static void e1000e_disable_aspm(struct pci_dev *pdev, u16 state)
+static void __e1000e_disable_aspm(struct pci_dev *pdev, u16 state, int locked)
{
struct pci_dev *parent = pdev->bus->self;
u16 aspm_dis_mask = 0;
@@ -6399,7 +6400,10 @@ static void e1000e_disable_aspm(struct pci_dev *pdev,
u16 state)
"L1" : "");
#ifdef CONFIG_PCIEASPM
- pci_disable_link_state_locked(pdev, state);
+ if (locked)
+ pci_disable_link_state_locked(pdev, state);
+ else
+ pci_disable_link_state(pdev, state);
/* Double-check ASPM control. If not disabled by the above, the
* BIOS is preventing that from happening (or CONFIG_PCIEASPM is
@@ -6422,6 +6426,32 @@ static void e1000e_disable_aspm(struct pci_dev *pdev,
u16 state)
aspm_dis_mask);
}
+/**
+ * e1000e_disable_aspm - Disable ASPM states.
+ * @pdev: pointer to PCI device struct
+ * @state: bit-mask of ASPM states to disable
+ *
+ * This function acquires the pci_bus_sem!
+ * Some devices *must* have certain ASPM states disabled per hardware errata.
+ **/
+static void e1000e_disable_aspm(struct pci_dev *pdev, u16 state)
+{
+ __e1000e_disable_aspm(pdev, state, 0);
+}
+
+/**
+ * e1000e_disable_aspm_locked Disable ASPM states.
+ * @pdev: pointer to PCI device struct
+ * @state: bit-mask of ASPM states to disable
+ *
+ * This function must be called with pci_bus_sem acquired!
+ * Some devices *must* have certain ASPM states disabled per hardware errata.
+ **/
+static void e1000e_disable_aspm_locked(struct pci_dev *pdev, u16 state)
+{
+ __e1000e_disable_aspm(pdev, state, 1);
+}
+
#ifdef CONFIG_PM
static int __e1000_resume(struct pci_dev *pdev)
{
@@ -6435,7 +6465,7 @@ static int __e1000_resume(struct pci_dev *pdev)
if (adapter->flags2 & FLAG2_DISABLE_ASPM_L1)
aspm_disable_flag |= PCIE_LINK_STATE_L1;
if (aspm_disable_flag)
- e1000e_disable_aspm(pdev, aspm_disable_flag);
+ e1000e_disable_aspm_locked(pdev, aspm_disable_flag);
pci_set_master(pdev);
--
2.4.3
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
