There is threadirqs kenel boot option which allow to force interrupt
routines to be performed as thread.
USB irq routines use spin_lock(*hci->lock) variant without disabling
interrupts, what is perfectly fine, but that can cause deadlock when
forced thread irqs are used. Deadlock scenario is quite reproducible for
me, as I can not boot system with threadirqs option, when some USB
device is connected. Patch marks USB irq routines with IRQF_NO_THREAD
to prevent forced threading.
Signed-off-by: Stanislaw Gruszka <sgrus...@redhat.com>
---
drivers/usb/core/hcd-pci.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
index d59d993..b4fa1a5 100644
--- a/drivers/usb/core/hcd-pci.c
+++ b/drivers/usb/core/hcd-pci.c
@@ -264,7 +264,7 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct
pci_device_id *id)
down_write(&companions_rwsem);
dev_set_drvdata(&dev->dev, hcd);
for_each_companion(dev, hcd, ehci_pre_add);
- retval = usb_add_hcd(hcd, hcd_irq, IRQF_SHARED);
+ retval = usb_add_hcd(hcd, hcd_irq, IRQF_SHARED |
IRQF_NO_THREAD);
if (retval != 0)
dev_set_drvdata(&dev->dev, NULL);
for_each_companion(dev, hcd, ehci_post_add);
@@ -272,7 +272,7 @@ int usb_hcd_pci_probe(struct pci_dev *dev, const struct
pci_device_id *id)
} else {
down_read(&companions_rwsem);
dev_set_drvdata(&dev->dev, hcd);
- retval = usb_add_hcd(hcd, hcd_irq, IRQF_SHARED);
+ retval = usb_add_hcd(hcd, hcd_irq, IRQF_SHARED |
IRQF_NO_THREAD);
if (retval != 0)
dev_set_drvdata(&dev->dev, NULL);
else
--
1.7.11.7
--
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