From: Tejun Heo <htejun@gmail.com>
To: petkovbb@gmail.com
Cc: bzolnier@gmail.com, axboe@kernel.dk, linux-ide@vger.kernel.org
Subject: Re: [PATCH 02/15] ide-tape: remove back-to-back REQUEST_SENSE detection
Date: Sun, 19 Apr 2009 16:36:16 +0900 [thread overview]
Message-ID: <49EAD470.50401@gmail.com> (raw)
In-Reply-To: <20090419072829.GA2906@liondog.tnic>
Hello,
Borislav Petkov wrote:
>> No, that's checking whether the _previous_ command was REQUEST_SENSE
>> which is guaranteed to be set if drive->failed_pc is not NULL.
>> drive->pc is set to the current command at the start of
>> ide_tape_issue_pc().
>
> Damn! Now it all falls into place nicely, thanks for clarifying that. My
> original bug analysis was simply plain wrong.
>
> So, drive->pc means two things: the previous command - until the moment
> when it is overwritten with the upcoming command from the current
> request _and_ the current command which is being issued.
And whether the previous pc is accessible or not depends on which
command it actually was and if failed_pc is set, it's guaranteed to be
valid.
> This is all quite b0rked...
Yeah, it's all way too fragile. :-(
--
tejun
next prev parent reply other threads:[~2009-04-19 7:36 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-04-17 9:33 [PATCHSET pata-2.6] ide: rq->buffer, data, special and misc cleanups, take#2 Tejun Heo
2009-04-17 9:33 ` [PATCH 01/15] block: clear req->errors on bio completion only for fs requests Tejun Heo
2009-04-17 9:33 ` [PATCH 02/15] ide-tape: remove back-to-back REQUEST_SENSE detection Tejun Heo
2009-04-17 10:23 ` Borislav Petkov
2009-04-17 10:35 ` Tejun Heo
2009-04-17 10:40 ` Tejun Heo
2009-04-17 11:03 ` Borislav Petkov
2009-04-17 21:12 ` Tejun Heo
2009-04-17 21:27 ` Mark Lord
2009-04-18 19:48 ` Borislav Petkov
2009-04-18 21:39 ` Tejun Heo
2009-04-19 7:28 ` Borislav Petkov
2009-04-19 7:36 ` Tejun Heo [this message]
2009-04-18 16:51 ` Bartlomiej Zolnierkiewicz
2009-04-18 21:42 ` Tejun Heo
2009-04-17 9:33 ` [PATCH 03/15] ide: use blk_run_queue() instead of blk_start_queueing() Tejun Heo
2009-04-17 9:33 ` [PATCH 04/15] ide: don't set REQ_SOFTBARRIER Tejun Heo
2009-04-17 9:33 ` [PATCH 05/15] ide kill unused ide_cmd->special Tejun Heo
2009-04-17 9:33 ` [PATCH 06/15] ide-cd: clear sense buffer before issuing request sense Tejun Heo
2009-04-17 9:33 ` [PATCH 07/15] ide-floppy: block pc always uses bio Tejun Heo
2009-04-17 9:33 ` [PATCH 08/15] ide-taskfile: don't abuse rq->buffer Tejun Heo
2009-04-17 9:33 ` [PATCH 09/15] ide-atapi: " Tejun Heo
2009-04-17 9:33 ` [PATCH 10/15] ide-cd: " Tejun Heo
2009-04-17 9:33 ` [PATCH 11/15] ide: add helpers for preparing sense requests Tejun Heo
2009-04-17 9:33 ` [PATCH 12/15] ide-cd: convert to using generic sense request Tejun Heo
2009-04-19 9:22 ` Borislav Petkov
2009-04-19 9:28 ` Tejun Heo
2009-04-19 9:30 ` Tejun Heo
2009-04-17 9:33 ` [PATCH 13/15] ide-atapi: convert ide-{floppy,tape} to using preallocated sense buffer Tejun Heo
2009-04-17 9:33 ` [PATCH 14/15] ide-cd,atapi: use bio for internal commands Tejun Heo
2009-04-17 9:33 ` [PATCH 15/15] ide-pm: don't abuse rq->data Tejun Heo
2009-04-18 16:32 ` [PATCHSET pata-2.6] ide: rq->buffer, data, special and misc cleanups, take#2 Bartlomiej Zolnierkiewicz
2009-04-18 20:04 ` Borislav Petkov
2009-04-18 21:43 ` Tejun Heo
2009-04-18 22:04 ` [GIT PATCH " Tejun Heo
2009-04-20 11:47 ` Bartlomiej Zolnierkiewicz
2009-04-20 11:59 ` Tejun Heo
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=49EAD470.50401@gmail.com \
--to=htejun@gmail.com \
--cc=axboe@kernel.dk \
--cc=bzolnier@gmail.com \
--cc=linux-ide@vger.kernel.org \
--cc=petkovbb@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.