[3/7] I/OAT: fail initialization on zero channels detection

Message ID 20090226100446.3615.46026.stgit@linux.site
State Not Applicable, archived
Delegated to: David Miller
Headers show

Commit Message

Sosnowski, Maciej Feb. 26, 2009, 10:04 a.m.
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(-)

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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;