arm/gicv2m: Set errno when gicv2_update_routing() fails

In case of an error when updating the routing table entries,
irq__update_msix_route() uses perror to print an error message.
gicv2m_update_routing() doesn't set errno, and instead returns the value
that errno should have had, which can lead to failure messages like this:

KVM_SET_GSI_ROUTING: Success

Set errno in gicv2m_update_routing() to avoid such messages in the future.

Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Link: https://lore.kernel.org/r/20211012132510.42134-2-alexandru.elisei@arm.com
Signed-off-by: Will Deacon <will@kernel.org>

1 files changed, 6 insertions, 4 deletions

diff --git a/arm/gicv2m.c b/arm/gicv2m.c
index d7e6398a..b47ada80 100644
--- a/arm/gicv2m.c
+++ b/arm/gicv2m.c
@@ -42,16 +42,18 @@ static int gicv2m_update_routing(struct kvm *kvm,
 {
 	int spi;
 
-	if (entry->type != KVM_IRQ_ROUTING_MSI)
-		return -EINVAL;
+	if (entry->type != KVM_IRQ_ROUTING_MSI) {
+		errno = EINVAL;
+		return -errno;
+	}
 
 	if (!entry->u.msi.address_hi && !entry->u.msi.address_lo)
 		return 0;
 
 	spi = entry->u.msi.data & GICV2M_SPI_MASK;
 	if (spi < v2m.first_spi || spi >= v2m.first_spi + v2m.num_spis) {
-		pr_err("invalid SPI number %d", spi);
-		return -EINVAL;
+		errno = EINVAL;
+		return -errno;
 	}
 
 	v2m.spis[spi - v2m.first_spi] = entry->gsi;