From 704cc92e9ffe29458ea8831ae097c631b1160c01 Mon Sep 17 00:00:00 2001 From: Anton Vorontsov Date: Thu, 24 Sep 2009 08:31:52 +0000 Subject: [PATCH] 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 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 commit 5b039e681b8c5f30aac9cc04385 "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 Signed-off-by: David S. Miller --- drivers/net/3c59x.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) diff --git a/drivers/net/3c59x.c b/drivers/net/3c59x.c index 7adff4d0960d..b9eeadf01b74 100644 --- a/drivers/net/3c59x.c +++ b/drivers/net/3c59x.c @@ -813,10 +813,10 @@ static int vortex_suspend(struct pci_dev *pdev, pm_message_t state) if (netif_running(dev)) { netif_device_detach(dev); vortex_down(dev, 1); + disable_irq(dev->irq); } pci_save_state(pdev); pci_enable_wake(pdev, pci_choose_state(pdev, state), 0); - free_irq(dev->irq, dev); pci_disable_device(pdev); pci_set_power_state(pdev, pci_choose_state(pdev, state)); } @@ -839,18 +839,12 @@ static int vortex_resume(struct pci_dev *pdev) return err; } pci_set_master(pdev); - if (request_irq(dev->irq, vp->full_bus_master_rx ? - &boomerang_interrupt : &vortex_interrupt, IRQF_SHARED, dev->name, dev)) { - pr_warning("%s: Could not reserve IRQ %d\n", dev->name, dev->irq); - pci_disable_device(pdev); - return -EBUSY; - } if (netif_running(dev)) { err = vortex_up(dev); if (err) return err; - else - netif_device_attach(dev); + enable_irq(dev->irq); + netif_device_attach(dev); } } return 0; -- 2.39.2