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cciss: Fallback to MSI rather than to INTx if MSI-X failed 

Currently the driver falls back to INTx mode when MSI-X
initialization failed. This is a suboptimal behaviour
for chips that also support MSI. This update changes that
behaviour and falls back to MSI mode in case MSI-X mode
initialization failed.

Signed-off-by: Alexander Gordeev <agordeev@redhat.com>
Cc: Mike Miller <mike.miller@hp.com>
Cc: iss_storagedev@hp.com
Cc: Jens Axboe <axboe@kernel.dk>
Cc: linux-pci@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Alexander Gordeev 2014-02-26 10:02:41 +01:00 committed by Jens Axboe
parent 106fd892bc
commit 371ff93a72
1 changed files with 0 additions and 2 deletions
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2
drivers/block/cciss.c
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@ -4092,11 +4092,9 @@ static void cciss_interrupt_mode(ctlr_info_t *h)
if (err > 0) {
dev_warn(&h->pdev->dev,
"only %d MSI-X vectors available\n", err);
goto default_int_mode;
} else {
dev_warn(&h->pdev->dev,
"MSI-X init failed %d\n", err);
goto default_int_mode;
}
}
if (pci_find_capability(h->pdev, PCI_CAP_ID_MSI)) {