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Subject[PATCH 6/9] xen/irq: If we fail during msi_capability_init return proper error code.
Date
There are three different modes: PV, HVM, and initial domain 0. In all
the cases we would return -1 for failure instead of a proper error code.
Fix this by propagating the error code from the generic IRQ code.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
arch/x86/pci/xen.c | 10 +++++++---
drivers/xen/events.c | 7 ++++---
2 files changed, 11 insertions(+), 6 deletions(-)
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 1017c7b..11a9301 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -175,8 +175,10 @@ static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
"pcifront-msi-x" :
"pcifront-msi",
DOMID_SELF);
- if (irq < 0)
+ if (irq < 0) {
+ ret = irq;
goto free;
+ }
i++;
}
kfree(v);
@@ -221,8 +223,10 @@ static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
if (msg.data != XEN_PIRQ_MSI_DATA ||
xen_irq_from_pirq(pirq) < 0) {
pirq = xen_allocate_pirq_msi(dev, msidesc);
- if (pirq < 0)
+ if (pirq < 0) {
+ irq = -ENODEV;
goto error;
+ }
xen_msi_compose_msg(dev, pirq, &msg);
__write_msi_msg(msidesc, &msg);
dev_dbg(&dev->dev, "xen: msi bound to pirq=%d\n", pirq);
@@ -244,7 +248,7 @@ static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
error:
dev_err(&dev->dev,
"Xen PCI frontend has not registered MSI/MSI-X support!\n");
- return -ENODEV;
+ return irq;
}

#ifdef CONFIG_XEN_DOM0
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 71d2363..93c69ee 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -432,7 +432,8 @@ static int __must_check xen_allocate_irq_dynamic(void)

irq = irq_alloc_desc_from(first, -1);

- xen_irq_init(irq);
+ if (irq >= 0)
+ xen_irq_init(irq);

return irq;
}
@@ -713,7 +714,7 @@ int xen_bind_pirq_msi_to_irq(struct pci_dev *dev, struct msi_desc *msidesc,
mutex_lock(&irq_mapping_update_lock);

irq = xen_allocate_irq_dynamic();
- if (irq == -1)
+ if (irq < 0)
goto out;

irq_set_chip_and_handler_name(irq, &xen_pirq_chip, handle_edge_irq,
@@ -729,7 +730,7 @@ out:
error_irq:
mutex_unlock(&irq_mapping_update_lock);
xen_free_irq(irq);
- return -1;
+ return ret;
}
#endif

--
1.7.4.1


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