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PR/49457 CVS commit: src/sys/dev/ata

The following reply was made to PR kern/49457; it has been noted by GNATS.

From: "Manuel Bouyer" <>
Subject: PR/49457 CVS commit: src/sys/dev/ata
Date: Fri, 5 Apr 2019 18:23:45 +0000

 Module Name:	src
 Committed By:	bouyer
 Date:		Fri Apr  5 18:23:45 UTC 2019
 Modified Files:
 	src/sys/dev/ata: wd.c wdvar.h
 Log Message:
 Implement a DIRTY flag (copied from sd(4)) so avoid flushing the cache if
 there has been no write. This avoids a (long) timeout on the flush cache
 command triggered by atactl sleep, when the device is open only by the atactl
 command itself.
 If a drive has no partition open and goes to sleep, the WDF_LOADED
 flag is clear, and the next open will issue  wd_get_params() command.
 But to wake up the drive a reset is required, and wd_get_params() doens't
 issue a reset on timeout, so there's no way to wake up the disk.
 Add a retry after reset to wd_get_params().
 Tested by Hauke Fath; fixes PR kern/49457
 To generate a diff of this commit:
 cvs rdiff -u -r1.446 -r1.447 src/sys/dev/ata/wd.c
 cvs rdiff -u -r1.48 -r1.49 src/sys/dev/ata/wdvar.h
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

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