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Filename Latest commit message Latest commit date
Guilherme G. Piccoli d1b490939d scsi: aacraid: Add a small delay after IOP reset 
Commit 0e9973ed33 ("scsi: aacraid: Add periodic checks to see IOP reset
status") changed the way driver checks if a reset succeeded. Now, after an
IOP reset, aacraid immediately start polling a register to verify the reset
is complete.

This behavior cause regressions on the reset path in PowerPC (at least).
Since the delay after the IOP reset was removed by the aforementioned patch,
the fact driver just starts to read a register instantly after the reset
was issued (by writing in another register) "corrupts" the reset procedure,
which ends up failing all the time.

The issue highly impacted kdump on PowerPC, since on kdump path we
proactively issue a reset in adapter (through the reset_devices kernel
parameter).

This patch (re-)adds a delay right after IOP reset is issued. Empirically
we measured that 3 seconds is enough, but for safety reasons we delay
for 5s (and since it was 30s before, 5s is still a small amount).

For reference, without this patch we observe the following messages
on kdump kernel boot process:

  [ 76.294] aacraid 0003:01:00.0: IOP reset failed
  [ 76.294] aacraid 0003:01:00.0: ARC Reset attempt failed
  [ 86.524] aacraid 0003:01:00.0: adapter kernel panic'd ff.
  [ 86.524] aacraid 0003:01:00.0: Controller reset type is 3
  [ 86.524] aacraid 0003:01:00.0: Issuing IOP reset
  [146.534] aacraid 0003:01:00.0: IOP reset failed
  [146.534] aacraid 0003:01:00.0: ARC Reset attempt failed

Fixes: 0e9973ed33 ("scsi: aacraid: Add periodic checks to see IOP reset status")
Cc: stable@vger.kernel.org # v4.13+
Signed-off-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com>
Acked-by: Dave Carroll <david.carroll@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2017-09-27 21:42:14 -04:00
arch The diff is dominated by the Allwinner A10/A20 SoCs getting converted to 2017-09-13 11:04:14 -07:00
block
certs
crypto
Documentation The diff is dominated by the Allwinner A10/A20 SoCs getting converted to 2017-09-13 11:04:14 -07:00
drivers scsi: aacraid: Add a small delay after IOP reset 2017-09-27 21:42:14 -04:00
firmware
fs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse 2017-09-13 10:10:19 -07:00
include The diff is dominated by the Allwinner A10/A20 SoCs getting converted to 2017-09-13 11:04:14 -07:00
init
ipc
kernel
lib
mm
net The highlights include: 2017-09-12 20:03:53 -07:00
samples
scripts A cleanup from Mauro that needed to wait for the media pull, plus a handful 2017-09-13 10:18:34 -07:00
security
sound The diff is dominated by the Allwinner A10/A20 SoCs getting converted to 2017-09-13 11:04:14 -07:00
tools
usr
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MAINTAINERS Fix up MAINTAINERS file sorting 2017-09-13 11:18:19 -07:00
Makefile
README

README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.