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authorVincent Whitchurch <vincent.whitchurch@axis.com>2023-01-26 11:47:10 +0100
committerRichard Weinberger <richard@nod.at>2023-02-13 10:14:31 +0100
commit935f8f7a0123ffa0a2dd7234713dc2ebeeb08955 (patch)
treefed9705f00fac7d49357059b41e74f276a1e58e6 /arch/um/drivers
parent314a1408b79a844dafdcde867d90de5d509409b7 (diff)
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>
Diffstat (limited to 'arch/um/drivers')
-rw-r--r--arch/um/drivers/virt-pci.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/um/drivers/virt-pci.c b/arch/um/drivers/virt-pci.c
index 6884e1be38e4..0aa71c08210d 100644
--- a/arch/um/drivers/virt-pci.c
+++ b/arch/um/drivers/virt-pci.c
@@ -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;