pata_via: disable ATAPI DMA on AVERATEC 3200 (6d0e194d) · Commits · e / devices / android_kernel_samsung_universal8890

On AVERATEC 3200, pata_via causes memory corruption with ATAPI DMA, which often leads to random kernel oops. The cause of the problem is not well understood yet and only small subset of machines using the controller seem affected. Blacklist ATAPI DMA on the machine. Signed-off-by:

Tejun Heo <tj@kernel.org> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=11426 Reported-and-tested-by:

Jim Bray <jimsantelmo@gmail.com> Cc: Alan Cox <alan@linux.intel.com> Cc: stable@kernel.org Signed-off-by:

Jeff Garzik <jgarzik@pobox.com>

drivers/ata/pata_via.c

+18 −0

Original line number	Diff line number	Diff line
		@@ -124,6 +124,17 @@ static const struct via_isa_bridge {
		{ NULL }
		};

		static const struct dmi_system_id no_atapi_dma_dmi_table[] = {
		{
		.ident = "AVERATEC 3200",
		.matches = {
		DMI_MATCH(DMI_BOARD_VENDOR, "AVERATEC"),
		DMI_MATCH(DMI_BOARD_NAME, "3200"),
		},
		},
		{ }
		};

		struct via_port {
		u8 cached_device;
		};
		@@ -355,6 +366,13 @@ static unsigned long via_mode_filter(struct ata_device *dev, unsigned long mask)
		mask &= ~ ATA_MASK_UDMA;
		}
		}

		if (dev->class == ATA_DEV_ATAPI &&
		dmi_check_system(no_atapi_dma_dmi_table)) {
		ata_dev_warn(dev, "controller locks up on ATAPI DMA, forcing PIO\n");
		mask &= ATA_MASK_PIO;
		}

		return mask;
		}