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um-virt-pci: Make max delay configurable

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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>
This commit is contained in:
Vincent Whitchurch 2023-01-26 11:47:10 +01:00 • committed by Richard Weinberger
parent 314a1408b7
commit 935f8f7a01
1 changed files with 3 additions and 2 deletions
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5
arch/um/drivers/virt-pci.c
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@ -54,7 +54,8 @@ static struct irq_domain *um_pci_inner_domain;
static struct irq_domain *um_pci_msi_domain;
static unsigned long um_pci_msi_used[BITS_TO_LONGS(MAX_MSI_VECTORS)];
#define UM_VIRT_PCI_MAXDELAY 40000
static unsigned int um_pci_max_delay_us = 40000;
module_param_named(max_delay_us, um_pci_max_delay_us, uint, 0644);
struct um_pci_message_buffer {
struct virtio_pcidev_msg hdr;
@ -155,7 +156,7 @@ static int um_pci_send_cmd(struct um_pci_device *dev,
kfree(completed);
if (WARN_ONCE(virtqueue_is_broken(dev->cmd_vq) ||
++delay_count > UM_VIRT_PCI_MAXDELAY,
++delay_count > um_pci_max_delay_us,
"um virt-pci delay: %d", delay_count)) {
ret = -EIO;
break;