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

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Submitter Sosnowski, Maciej
Date Feb. 26, 2009, 10:04 a.m.
Message ID <20090226100446.3615.46026.stgit@linux.site>
Download mbox | patch
Permalink /patch/23761/
State Not Applicable
Delegated to: David Miller
Headers show

Comments

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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Patch

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;