PR/54855 CVS commit: src/sys/dev/ata

["Jaromir Dolecek" <jdolecek%netbsd.org@localhost>]

The following reply was made to PR kern/54855; it has been noted by GNATS.

From: "Jaromir Dolecek" <jdolecek%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/54855 CVS commit: src/sys/dev/ata
Date: Mon, 13 Jan 2020 21:20:18 +0000

 Module Name:	src
 Committed By:	jdolecek
 Date:		Mon Jan 13 21:20:17 UTC 2020
 
 Modified Files:
 	src/sys/dev/ata: wd.c
 
 Log Message:
 disable NCQ by default for "Samsung SSD 860 EVO 1TB" and
 "Samsung SSD 860 EVO 500GB" - these drives have known broken NCQ support
 particularly when used with AMD SB710/750 chipsets, problem occur also
 under Linux and Windows
 
 https://eu.community.samsung.com/t5/Cameras-IT-Everything-Else/860-EVO-250GB-causing-freezes-on-AMD-system/td-p/575813
 https://bugzilla.kernel.org/show_bug.cgi?id=201693
 
 It seems there is no Samsung firmware update to fix this even.
 
 Disable NCQ regardless of the controller, it's likely same problem
 exists with other controllers too.
 
 This should fix PR kern/54790 and PR kern/54855
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.453 -r1.454 src/sys/dev/ata/wd.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.