CVS commit: src/sys/dev/ata

["Manuel Bouyer" <bouyer%netbsd.org@localhost>]

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.