From: David Milburn <dmilburn@redhat.com>
Date: Mon, 29 Oct 2012 23:00:22 +0000 (-0500)
Subject: sata_svw: check DMA start bit before reset
X-Git-Tag: v3.7-rc7~36^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b03e66a6be91f8389fcd902ab6c1563db1c9c06b;p=pandora-kernel.git

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>
---

Reading git-diff-tree failed