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SubjectRe: Linux 2.6.20-rc6 - sky2 resume breakage
On Mon, 29 Jan 2007 21:10:30 +0100
Thomas Gleixner <tglx@linutronix.de> wrote:

> On Mon, 2007-01-29 at 11:31 -0800, Stephen Hemminger wrote:
> > Does this fix it?
>
> Don't know.

Sorry it was against the last patch I sent to Jeff for netdev.
Here is against 2.6.20-rc6

---
drivers/net/sky2.c | 43 ++++++++++++++++++-------------------------
1 files changed, 18 insertions(+), 25 deletions(-)
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index a2e804d..d85de63 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -3598,6 +3598,12 @@ static int sky2_suspend(struct pci_dev *
}
}

+ /* Turn off IRQ to avoid power management bug (see resume) */
+ if (hw->msi) {
+ free_irq(pdev->irq, hw);
+ pci_disable_msi(pdev);
+ }
+
sky2_write32(hw, B0_IMSK, 0);
pci_save_state(pdev);
sky2_set_power_state(hw, pstate);
@@ -3619,6 +3625,18 @@ static int sky2_resume(struct pci_dev *p

sky2_write32(hw, B0_IMSK, Y2_IS_BASE);

+ /* Can't re-enable MSI because kernel resume ordering is broken
+ * and calls device resume before ACPI (BIOS) is called.
+ * BIOS then resets device to INTx!
+ */
+ if (hw->msi) {
+ err = request_irq(pdev->irq, sky2_intr, IRQF_SHARED,
+ hw->dev[0]->name, hw);
+ if (err)
+ goto out;
+ hw->msi = 0;
+ }
+
for (i = 0; i < hw->ports; i++) {
struct net_device *dev = hw->dev[i];
if (netif_running(dev)) {
@@ -3639,29 +3657,6 @@ static int sky2_resume(struct pci_dev *p
out:
return err;
}
-
-/* BIOS resume runs after device (it's a bug in PM)
- * as a temporary workaround on suspend/resume leave MSI disabled
- */
-static int sky2_suspend_late(struct pci_dev *pdev, pm_message_t state)
-{
- struct sky2_hw *hw = pci_get_drvdata(pdev);
-
- free_irq(pdev->irq, hw);
- if (hw->msi) {
- pci_disable_msi(pdev);
- hw->msi = 0;
- }
- return 0;
-}
-
-static int sky2_resume_early(struct pci_dev *pdev)
-{
- struct sky2_hw *hw = pci_get_drvdata(pdev);
- struct net_device *dev = hw->dev[0];
-
- return request_irq(pdev->irq, sky2_intr, IRQF_SHARED, dev->name, hw);
-}
#endif

static struct pci_driver sky2_driver = {
@@ -3672,8 +3667,6 @@ static struct pci_driver sky2_driver = {
#ifdef CONFIG_PM
.suspend = sky2_suspend,
.resume = sky2_resume,
- .suspend_late = sky2_suspend_late,
- .resume_early = sky2_resume_early,
#endif
};

--
1.4.1
-
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