Re: [Bug #13663] suspend to ram regression (IDE related)

Wu Zhangjin
2009-07-02T01:46:43Z

On Wed, 2009-07-01 at 18:29 +0200, Bartlomiej Zolnierkiewicz wrote:
> On Wednesday 01 July 2009 18:21:25 Bartlomiej Zolnierkiewicz wrote:
> > On Wednesday 01 July 2009 16:47:41 Wu Zhangjin wrote:
> > > On Wed, 2009-07-01 at 22:31 +0800, Jeff Chua wrote:
> > > > On Tue, Jun 30, 2009 at 12:21 AM, Jeff Chua<jeff.chua.linux-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > > >
> > > > > I just tried, and it "seems" to work. Will try a few more cycles.
> > > >
> > > > STD/STR survived quite a few cycles now. Patch seems to be doing the
> > > > right thing.
> > > >
> > > > On Mon, Jun 29, 2009 at 11:51 PM, Etienne
> > > > Basset<etienne.basset-Bf/eaXMDFuuXqB7oj33eUg@public.gmane.org> wrote:
> > > >
> > > > > To have STR/resume work with current git, I have to :
> > > >
> > > > > 1) apply Bart's patch
> > > >
> > > > This is not yet in Linus's tree. And much needed to really fix the problem.
> > > >
> > > > > 2) revert this commit : a1317f714af7aed60ddc182d0122477cbe36ee9b
> > > >
> > >
> > > Yes, This commit must be reverted, otherwise, STD/Hibernation will not
> > > work either. I have tested it on two different loongson-based machines:
> > > fuloong2e box and yeeloong2f netbook.(loongson is mips compatiable)
> >
> > Since it seems like Dave is taking his sweet time with doing the revert
> > I stared at the code a bit more and I think that I finally found the bug
> > (thanks to your debugging work for giving me the right hint!).
> >
> > The patch needs to take into the account a new code introduced by the recent
> > block layer changes (commit 8f6205cd572fece673da0255d74843680f67f879):
> >
> > @@ -555,8 +560,11 @@ repeat:
> > startstop = start_request(drive, rq);
> > spin_lock_irq(&hwif->lock);
> >
> > - if (startstop == ide_stopped)
> > + if (startstop == ide_stopped) {
> > + rq = hwif->rq;
> > + hwif->rq = NULL;
> > goto repeat;
> > + }
> > } else
> > goto plug_device;
> > out:
> >
> > and not zero hwif->rq if the device is blocked.
> >
> > Could you try the attached patch and see if it fixes the issue?
>
> Here is the more complete version, also taking into the account changes
> in ide_intr() and ide_timer_expiry():
>

Sorry, I can not apply this patch directly, which original version did
you use? I used the one in the master branch of linux-mips development
git repository.

commit 5a4f13fad1ab5bd08dea78fc55321e429d83cddf
Merge: ec9c45d e18ed14
Author: Linus Torvalds <torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
Date: Mon Jun 29 20:07:43 2009 -0700

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide-2.6:
ide: memory overrun in ide_get_identity_ioctl() on big endian
machines using ioctl HDIO_OBSOLETE_IDENTITY
ide: fix resume for CONFIG_BLK_DEV_IDEACPI=y
ide-cd: handle fragmented packet commands gracefully
ide: always kill the whole request on error
ide: fix ide_kill_rq() for special ide-{floppy,tape} driver
requests

it this too old? should i merge another git repository?

I have tried to apply it manually, but unfortunately, also not work. any
other patch needed?

Thanks!
Wu Zhangjin
> ---
> drivers/ide/ide-io.c | 15 ++++++++++-----
> 1 file changed, 10 insertions(+), 5 deletions(-)
>
> Index: b/drivers/ide/ide-io.c
> ===================================================================
> --- a/drivers/ide/ide-io.c
> +++ b/drivers/ide/ide-io.c
> @@ -532,7 +532,8 @@ repeat:
>
> if (startstop == ide_stopped) {
> rq = hwif->rq;
> - hwif->rq = NULL;
> + if ((drive->dev_flags & IDE_DFLAG_BLOCKED) == 0)
> + hwif->rq = NULL;
> goto repeat;
> }
> } else
> @@ -679,8 +680,10 @@ void ide_timer_expiry (unsigned long dat
> spin_lock_irq(&hwif->lock);
> enable_irq(hwif->irq);
> if (startstop == ide_stopped && hwif->polling == 0) {
> - rq_in_flight = hwif->rq;
> - hwif->rq = NULL;
> + if ((drive->dev_flags & IDE_DFLAG_BLOCKED) == 0) {
> + rq_in_flight = hwif->rq;
> + hwif->rq = NULL;
> + }
> ide_unlock_port(hwif);
> plug_device = 1;
> }
> @@ -856,8 +859,10 @@ irqreturn_t ide_intr (int irq, void *dev
> */
> if (startstop == ide_stopped && hwif->polling == 0) {
> BUG_ON(hwif->handler);
> - rq_in_flight = hwif->rq;
> - hwif->rq = NULL;
> + if ((drive->dev_flags & IDE_DFLAG_BLOCKED) == 0) {
> + rq_in_flight = hwif->rq;
> + hwif->rq = NULL;
> + }
> ide_unlock_port(hwif);
> plug_device = 1;
> }