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Subject[PATCH v2 2/3] scsi: arcmsr: Add driver module parameter msix_enable
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From: Ching Huang <ching2048@areca.com.tw>

Add module parameter msix_enable to has a chance to disable msix interrupt if between controller and system has
msix INT compatible issue.

Signed-off-by: Ching Huang <ching2048@areca.com.tw>
---
diff -uprN a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
--- a/drivers/scsi/arcmsr/arcmsr_hba.c 2017-11-24 15:16:20.000000000 +0800
+++ b/drivers/scsi/arcmsr/arcmsr_hba.c 2017-11-24 15:17:46.000000000 +0800
@@ -75,6 +75,10 @@ MODULE_DESCRIPTION("Areca ARC11xx/12xx/1
MODULE_LICENSE("Dual BSD/GPL");
MODULE_VERSION(ARCMSR_DRIVER_VERSION);

+static int msix_enable = 1;
+module_param(msix_enable, int, S_IRUGO);
+MODULE_PARM_DESC(msix_enable, "Enable MSI-X interrupt(0 ~ 1), msix_enable=1(enable), =0(disable)");
+
static int msi_enable = 1;
module_param(msi_enable, int, S_IRUGO);
MODULE_PARM_DESC(msi_enable, "Enable MSI interrupt(0 ~ 1), msi_enable=1(enable), =0(disable)");
@@ -829,12 +833,15 @@ arcmsr_request_irq(struct pci_dev *pdev,
unsigned long flags;
int nvec, i;

+ if (msix_enable == 0)
+ goto msi_int0;
nvec = pci_alloc_irq_vectors(pdev, 1, ARCMST_NUM_MSIX_VECTORS,
PCI_IRQ_MSIX);
if (nvec > 0) {
pr_info("arcmsr%d: msi-x enabled\n", acb->host->host_no);
flags = 0;
} else {
+msi_int0:
if (msi_enable == 1) {
nvec = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
if (nvec == 1) {

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