Commit 935f8f7a authored by Vincent Whitchurch's avatar Vincent Whitchurch Committed by Richard Weinberger
Browse files

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: default avatarVincent Whitchurch <vincent.whitchurch@axis.com>
Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
parent 314a1408

arch/um/drivers/virt-pci.c

+3 −2
Original line number Diff line number Diff line
@@ -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;