Commit 8b794b14 authored Feb 26, 2009 by Maciej Sosnowski Committed by Dan Williams Mar 04, 2009

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>

parent ea9c717d

drivers/dma/ioat_dma.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -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;