diff options
| author | Benjamin Rood <benjaminjrood@gmail.com> | 2015-10-30 10:53:31 -0400 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2015-11-02 23:41:13 -0500 |
| commit | c913df3f3d6f7f5e5ed845e2786b0fc98a41482f (patch) | |
| tree | 77853d04ac0b614607ba052bc6f037d4db16bda9 /drivers/scsi/pm8001 | |
| parent | b650a8806e1ba0315fbeda8b45c9e53d73abbb6f (diff) | |
| download | linux-c913df3f3d6f7f5e5ed845e2786b0fc98a41482f.tar.bz2 | |
pm80xx: avoid a panic if MSI(X) interrupts are disabled
If MSI(X) interrupts are disabled via the kernel command line
(pci=nomsi), the pm8001 driver will kernel panic because it does not
detect that MSI interrupts are disabled and will soldier on and attempt to
configure MSI interrupts anyways. This leads to a kernel panic, most
likely because a required data structure is not available down the
line. Using the pci_msi_enabled() function in order to detect if MSI
interrupts are enabled before configuring them resolves this issue and
avoids a kernel panic when the module is loaded. Additionally, the
irq_vector structure must be initialized when legacy interrupts are
being used otherwise legacy interrupts will simply not function and
result in another panic.
Signed-off-by: Benjamin Rood <brood@attotech.com>
Reviewed-by: Jack Wang <jinpu.wang@profitbricks.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/pm8001')
| -rw-r--r-- | drivers/scsi/pm8001/pm8001_init.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/scsi/pm8001/pm8001_init.c b/drivers/scsi/pm8001/pm8001_init.c index d147c415d8ba..d161fd90c89f 100644 --- a/drivers/scsi/pm8001/pm8001_init.c +++ b/drivers/scsi/pm8001/pm8001_init.c @@ -482,7 +482,8 @@ static struct pm8001_hba_info *pm8001_pci_alloc(struct pci_dev *pdev, #ifdef PM8001_USE_TASKLET /* Tasklet for non msi-x interrupt handler */ - if ((!pdev->msix_cap) || (pm8001_ha->chip_id == chip_8001)) + if ((!pdev->msix_cap || !pci_msi_enabled()) + || (pm8001_ha->chip_id == chip_8001)) tasklet_init(&pm8001_ha->tasklet[0], pm8001_tasklet, (unsigned long)&(pm8001_ha->irq_vector[0])); else @@ -951,7 +952,7 @@ static u32 pm8001_request_irq(struct pm8001_hba_info *pm8001_ha) pdev = pm8001_ha->pdev; #ifdef PM8001_USE_MSIX - if (pdev->msix_cap) + if (pdev->msix_cap && pci_msi_enabled()) return pm8001_setup_msix(pm8001_ha); else { PM8001_INIT_DBG(pm8001_ha, @@ -962,6 +963,8 @@ static u32 pm8001_request_irq(struct pm8001_hba_info *pm8001_ha) intx: /* initialize the INT-X interrupt */ + pm8001_ha->irq_vector[0].irq_id = 0; + pm8001_ha->irq_vector[0].drv_inst = pm8001_ha; rc = request_irq(pdev->irq, pm8001_interrupt_handler_intx, IRQF_SHARED, DRV_NAME, SHOST_TO_SAS_HA(pm8001_ha->shost)); return rc; @@ -1112,7 +1115,8 @@ static void pm8001_pci_remove(struct pci_dev *pdev) #endif #ifdef PM8001_USE_TASKLET /* For non-msix and msix interrupts */ - if ((!pdev->msix_cap) || (pm8001_ha->chip_id == chip_8001)) + if ((!pdev->msix_cap || !pci_msi_enabled()) || + (pm8001_ha->chip_id == chip_8001)) tasklet_kill(&pm8001_ha->tasklet[0]); else for (j = 0; j < PM8001_MAX_MSIX_VEC; j++) @@ -1161,7 +1165,8 @@ static int pm8001_pci_suspend(struct pci_dev *pdev, pm_message_t state) #endif #ifdef PM8001_USE_TASKLET /* For non-msix and msix interrupts */ - if ((!pdev->msix_cap) || (pm8001_ha->chip_id == chip_8001)) + if ((!pdev->msix_cap || !pci_msi_enabled()) || + (pm8001_ha->chip_id == chip_8001)) tasklet_kill(&pm8001_ha->tasklet[0]); else for (j = 0; j < PM8001_MAX_MSIX_VEC; j++) @@ -1230,7 +1235,8 @@ static int pm8001_pci_resume(struct pci_dev *pdev) goto err_out_disable; #ifdef PM8001_USE_TASKLET /* Tasklet for non msi-x interrupt handler */ - if ((!pdev->msix_cap) || (pm8001_ha->chip_id == chip_8001)) + if ((!pdev->msix_cap || !pci_msi_enabled()) || + (pm8001_ha->chip_id == chip_8001)) tasklet_init(&pm8001_ha->tasklet[0], pm8001_tasklet, (unsigned long)&(pm8001_ha->irq_vector[0])); else |