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um-virt-pci: Make max delay configurable
There is a hard coded maximum time for which the driver busy-loops waiting for a response from the virtio device. This default time may be too short for some systems, so make it a module parameter so that it can be set via the kernel command line. Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com> Signed-off-by: Richard Weinberger <richard@nod.at>
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1 changed files with 3 additions and 2 deletions
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@ -54,7 +54,8 @@ static struct irq_domain *um_pci_inner_domain;
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static struct irq_domain *um_pci_msi_domain;
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static unsigned long um_pci_msi_used[BITS_TO_LONGS(MAX_MSI_VECTORS)];
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#define UM_VIRT_PCI_MAXDELAY 40000
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static unsigned int um_pci_max_delay_us = 40000;
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module_param_named(max_delay_us, um_pci_max_delay_us, uint, 0644);
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struct um_pci_message_buffer {
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struct virtio_pcidev_msg hdr;
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@ -155,7 +156,7 @@ static int um_pci_send_cmd(struct um_pci_device *dev,
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kfree(completed);
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if (WARN_ONCE(virtqueue_is_broken(dev->cmd_vq) ||
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++delay_count > UM_VIRT_PCI_MAXDELAY,
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++delay_count > um_pci_max_delay_us,
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"um virt-pci delay: %d", delay_count)) {
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ret = -EIO;
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break;
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