linux-kernel - [PATCH] PCI: hv: Fix the definiton of vector in hv_compose_msi

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Date:   Mon, 15 Aug 2022 11:55:05 -0700
From:   Dexuan Cui <decui@...rosoft.com>
To:     quic_jhugo@...cinc.com, wei.liu@...nel.org, kys@...rosoft.com,
        haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        lpieralisi@...nel.org, bhelgaas@...gle.com,
        linux-hyperv@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, mikelley@...rosoft.com,
        robh@...nel.org, kw@...ux.com, helgaas@...nel.org,
        alex.williamson@...hat.com, boqun.feng@...il.com,
        Boqun.Feng@...rosoft.com
Cc:     Dexuan Cui <decui@...rosoft.com>,
        Carl Vanderlip <quic_carlv@...cinc.com>
Subject: [PATCH] PCI: hv: Fix the definiton of vector in hv_compose_msi_msg()

The local variable 'vector' must be u32 rather than u8: see the
struct hv_msi_desc3.

'vector_count' should be u16 rather than u8: see struct hv_msi_desc,
hv_msi_desc2 and hv_msi_desc3.

Fixes: a2bad844a67b ("PCI: hv: Fix interrupt mapping for multi-MSI")
Signed-off-by: Dexuan Cui <decui@...rosoft.com>
Cc: Jeffrey Hugo <quic_jhugo@...cinc.com>
Cc: Carl Vanderlip <quic_carlv@...cinc.com>
---

The patch should be appplied after the earlier patch:
    [PATCH] PCI: hv: Only reuse existing IRTE allocation for Multi-MSI
    https://lwn.net/ml/linux-kernel/20220804025104.15673-1-decui%40microsoft.com/

 drivers/pci/controller/pci-hyperv.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index 65d0dab25deb..53580899c859 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -1614,7 +1614,7 @@ static void hv_pci_compose_compl(void *context, struct pci_response *resp,
 
 static u32 hv_compose_msi_req_v1(
 	struct pci_create_interrupt *int_pkt, struct cpumask *affinity,
-	u32 slot, u8 vector, u8 vector_count)
+	u32 slot, u8 vector, u16 vector_count)
 {
 	int_pkt->message_type.type = PCI_CREATE_INTERRUPT_MESSAGE;
 	int_pkt->wslot.slot = slot;
@@ -1642,7 +1642,7 @@ static int hv_compose_msi_req_get_cpu(struct cpumask *affinity)
 
 static u32 hv_compose_msi_req_v2(
 	struct pci_create_interrupt2 *int_pkt, struct cpumask *affinity,
-	u32 slot, u8 vector, u8 vector_count)
+	u32 slot, u8 vector, u16 vector_count)
 {
 	int cpu;
 
@@ -1661,7 +1661,7 @@ static u32 hv_compose_msi_req_v2(
 
 static u32 hv_compose_msi_req_v3(
 	struct pci_create_interrupt3 *int_pkt, struct cpumask *affinity,
-	u32 slot, u32 vector, u8 vector_count)
+	u32 slot, u32 vector, u16 vector_count)
 {
 	int cpu;
 
@@ -1702,7 +1702,8 @@ static void hv_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
 	struct tran_int_desc *int_desc;
 	struct msi_desc *msi_desc;
 	bool multi_msi;
-	u8 vector, vector_count;
+	u32 vector; /* Must be u32: see the struct hv_msi_desc3 */
+	u16 vector_count;
 	struct {
 		struct pci_packet pci_pkt;
 		union {
-- 
2.25.1