diff options
| -rw-r--r-- | drivers/scsi/stex.c | 48 |
1 files changed, 43 insertions, 5 deletions
diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c index de6c30e37463..c4eb5c1cc1bc 100644 --- a/drivers/scsi/stex.c +++ b/drivers/scsi/stex.c @@ -292,11 +292,15 @@ struct st_hba { struct st_ccb *wait_ccb; unsigned int mu_status; - int out_req_cnt; - unsigned int cardtype; + int msi_enabled; + int out_req_cnt; }; +static int msi; +module_param(msi, int, 0); +MODULE_PARM_DESC(msi, "Enable Message Signaled Interrupts(0=off, 1=on)"); + static const char console_inq_page[] = { 0x03,0x00,0x03,0x03,0xFA,0x00,0x00,0x30, @@ -1041,6 +1045,40 @@ static int stex_set_dma_mask(struct pci_dev * pdev) return ret; } +static int stex_request_irq(struct st_hba *hba) +{ + struct pci_dev *pdev = hba->pdev; + int status; + + if (msi) { + status = pci_enable_msi(pdev); + if (status != 0) + printk(KERN_ERR DRV_NAME + "(%s): error %d setting up MSI\n", + pci_name(pdev), status); + else + hba->msi_enabled = 1; + } else + hba->msi_enabled = 0; + + status = request_irq(pdev->irq, stex_intr, IRQF_SHARED, DRV_NAME, hba); + + if (status != 0) { + if (hba->msi_enabled) + pci_disable_msi(pdev); + } + return status; +} + +static void stex_free_irq(struct st_hba *hba) +{ + struct pci_dev *pdev = hba->pdev; + + free_irq(pdev->irq, hba); + if (hba->msi_enabled) + pci_disable_msi(pdev); +} + static int __devinit stex_probe(struct pci_dev *pdev, const struct pci_device_id *id) { @@ -1125,7 +1163,7 @@ stex_probe(struct pci_dev *pdev, const struct pci_device_id *id) hba->host = host; hba->pdev = pdev; - err = request_irq(pdev->irq, stex_intr, IRQF_SHARED, DRV_NAME, hba); + err = stex_request_irq(hba); if (err) { printk(KERN_ERR DRV_NAME "(%s): request irq failed\n", pci_name(pdev)); @@ -1157,7 +1195,7 @@ stex_probe(struct pci_dev *pdev, const struct pci_device_id *id) return 0; out_free_irq: - free_irq(pdev->irq, hba); + stex_free_irq(hba); out_pci_free: dma_free_coherent(&pdev->dev, hba->dma_size, hba->dma_mem, hba->dma_handle); @@ -1216,7 +1254,7 @@ static void stex_hba_stop(struct st_hba *hba) static void stex_hba_free(struct st_hba *hba) { - free_irq(hba->pdev->irq, hba); + stex_free_irq(hba); iounmap(hba->mmio_base); |