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scsi: ipr: Fix runaway IRQs when falling back from MSI to LSI 

LSIs must be ack'ed with an MMIO otherwise they remain asserted
forever. This is controlled by the "clear_isr" flag.

While we set that flag properly when deciding initially whether to use
LSIs or MSIs, we fail to set it if we first chose MSIs, the test fails,
then fallback to LSIs.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Benjamin Herrenschmidt 2016-11-30 15:28:55 -06:00 committed by Martin K. Petersen
parent af25756de9
commit 9dadfb973f
1 changed files with 1 additions and 0 deletions
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drivers/scsi/ipr.c
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@ -10157,6 +10157,7 @@ static int ipr_probe_ioa(struct pci_dev *pdev,
pci_free_irq_vectors(pdev);
ioa_cfg->nvectors = 1;
ioa_cfg->clear_isr = 1;
break;
default:
goto out_msi_disable;