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I/OAT: fail initialization on zero channels detection 

On some systems with I/OAT ver.2 when DCA is disabled in BIOS
situations have been observed
that zero DMA channels are detected instead of four.
To avoid kernel panic driver should fail gracefully with appropriate message.

Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Maciej Sosnowski 2009-02-26 11:04:54 +01:00 committed by Dan Williams
parent ea9c717d01
commit 8b794b141c
1 changed files with 7 additions and 0 deletions
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7
drivers/dma/ioat_dma.c
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@ -1659,6 +1659,13 @@ struct ioatdma_device *ioat_dma_probe(struct pci_dev *pdev,
" %d channels, device version 0x%02x, driver version %s\n",
device->common.chancnt, device->version, IOAT_DMA_VERSION);
if (!device->common.chancnt) {
dev_err(&device->pdev->dev,
"Intel(R) I/OAT DMA Engine problem found: "
"zero channels detected\n");
goto err_setup_interrupts;
}
err = ioat_dma_setup_interrupts(device);
if (err)
goto err_setup_interrupts;