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| author | David Milburn <dmilburn@redhat.com> | 2012-10-29 18:00:22 -0500 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2012-11-15 23:54:41 -0500 |
| commit | b03e66a6be91f8389fcd902ab6c1563db1c9c06b (patch) | |
| tree | 97049500a3dd0fd3c7c7801d5f6a697b006f1fb1 /drivers/ata/ahci_platform.c | |
| parent | cd705d5ad49bb8894dda2726dcaef8f63ddeba43 (diff) | |
| download | linux-stable-b03e66a6be91f8389fcd902ab6c1563db1c9c06b.tar.gz linux-stable-b03e66a6be91f8389fcd902ab6c1563db1c9c06b.tar.bz2 linux-stable-b03e66a6be91f8389fcd902ab6c1563db1c9c06b.zip | |
sata_svw: check DMA start bit before reset
If kdump is triggered with pending IO, controller may not respond causing
kdump to fail.
http://marc.info/?l=linux-ide&m=133032255424658&w=2
During error recovery ata_do_dev_read_id never completes due hang
in mmio_insw.
ata_do_dev_read_id
ata_sff_data_xfer
ioread16_rep
mmio_insw
if DMA start bit is cleared before reset, PIO command is successful
and kdump succeeds.
Signed-off-by: David Milburn <dmilburn@redhat.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata/ahci_platform.c')
0 files changed, 0 insertions, 0 deletions