3c59x: Get rid of "Trying to free already-free IRQ"
Following trace pops up if we try to suspend with 3c59x ethernet NIC brought down: root@b1:~# ifconfig eth16 down root@b1:~# echo mem > /sys/power/state ... 3c59x 0000:00:10.0: suspend 3c59x 0000:00:10.0: PME# disabled Trying to free already-free IRQ 48 ------------[ cut here ]------------ Badness at c00554e4 [verbose debug info unavailable] NIP: c00554e4 LR: c00554e4 CTR: c019a098 REGS: c7975c60 TRAP: 0700 Not tainted (2.6.31-rc4) MSR: 00021032 <ME,CE,IR,DR> CR: 28242422 XER: 20000000 TASK = c79cb0c0[1746] 'bash' THREAD: c7974000 ... NIP [c00554e4] __free_irq+0x108/0x1b0 LR [c00554e4] __free_irq+0x108/0x1b0 Call Trace: [c7975d10
] [c00554e4] __free_irq+0x108/0x1b0 (unreliable) [c7975d30] [c005559c] free_irq+0x10/0x24 [c7975d40] [c01e21ec] vortex_suspend+0x70/0xc4 [c7975d60] [c017e584] pci_legacy_suspend+0x58/0x100 This is because the driver manages interrupts without checking for netif_running(). Though, there are few other issues with suspend/resume in this driver. The intention of calling free_irq() in suspend() was to avoid any possible spurious interrupts (see commit5b039e681b
"3c59x PM fixes"). But, - On resume, the driver was requesting IRQ just after pci_set_master(), but before vortex_up() (which actually resets 3c59x chips). - Issuing free_irq() on a shared IRQ doesn't guarantee that a buggy HW won't trigger spurious interrupts in another driver that requested the same interrupt. So, if we want to protect from unexpected interrupts, then on suspend we should issue disable_irq(), not free_irq(). Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -813,10 +813,10 @@ static int vortex_suspend(struct pci_dev *pdev, pm_message_t state)
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if (netif_running(dev)) {
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netif_device_detach(dev);
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vortex_down(dev, 1);
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disable_irq(dev->irq);
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}
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pci_save_state(pdev);
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pci_enable_wake(pdev, pci_choose_state(pdev, state), 0);
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free_irq(dev->irq, dev);
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pci_disable_device(pdev);
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pci_set_power_state(pdev, pci_choose_state(pdev, state));
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}
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@ -839,18 +839,12 @@ static int vortex_resume(struct pci_dev *pdev)
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return err;
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}
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pci_set_master(pdev);
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if (request_irq(dev->irq, vp->full_bus_master_rx ?
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&boomerang_interrupt : &vortex_interrupt, IRQF_SHARED, dev->name, dev)) {
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pr_warning("%s: Could not reserve IRQ %d\n", dev->name, dev->irq);
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pci_disable_device(pdev);
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return -EBUSY;
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}
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if (netif_running(dev)) {
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err = vortex_up(dev);
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if (err)
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return err;
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else
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netif_device_attach(dev);
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enable_irq(dev->irq);
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netif_device_attach(dev);
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}
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}
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return 0;
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