Messages in this thread Patch in this message | | | From | Maciej Sosnowski <> | Subject | [PATCH 3/7] I/OAT: fail initialization on zero channels detection | Date | Thu, 26 Feb 2009 11:04:54 +0100 |
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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.krisher@intel.com> ---
drivers/dma/ioat_dma.c | 7 +++++++ 1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c index 879f4a0..9012da7 100644 --- a/drivers/dma/ioat_dma.c +++ b/drivers/dma/ioat_dma.c @@ -1659,6 +1659,13 @@ struct ioatdma_device *ioat_dma_probe(st " %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;
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