linux-hardening - Re: Fwd: Waking up from resume locks up on sr device

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Date:   Wed, 14 Jun 2023 13:49:31 +0900
From:   Damien Le Moal <dlemoal@...nel.org>
To:     Joe Breuer <linux-kernel@...reuer.net>,
        Bart Van Assche <bvanassche@....org>,
        Bagas Sanjaya <bagasdotme@...il.com>,
        Pavel Machek <pavel@....cz>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <len.brown@...el.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>,
        Tony Luck <tony.luck@...el.com>,
        "Guilherme G. Piccoli" <gpiccoli@...lia.com>,
        Thorsten Leemhuis <linux@...mhuis.info>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Linux Power Management <linux-pm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Hardening <linux-hardening@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>,
        Linux SCSI <linux-scsi@...r.kernel.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Dan Williams <dan.j.williams@...el.com>,
        Hannes Reinecke <hare@...e.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Martin Kepplinger <martin.kepplinger@...i.sm>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>
Subject: Re: Fwd: Waking up from resume locks up on sr device

On 6/11/23 18:05, Joe Breuer wrote:
> I'm the reporter of this issue.
> 
> I just tried this patch against 6.3.4, and it completely fixes my
> suspend/resume issue.
> 
> The optical drive stays usable after resume, even suspending/resuming
> during playback of CDDA content works flawlessly and playback resumes
> seamlessly after system resume.
> 
> So, from my perspective: Good one!

In place of Bart's fix, could you please try this patch ?

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index b80e68000dd3..a81eb4f882ab 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -4006,9 +4006,32 @@ static void ata_eh_handle_port_resume(struct
ata_port *ap)
        /* tell ACPI that we're resuming */
        ata_acpi_on_resume(ap);

-       /* update the flags */
        spin_lock_irqsave(ap->lock, flags);
+
+       /* Update the flags */
        ap->pflags &= ~(ATA_PFLAG_PM_PENDING | ATA_PFLAG_SUSPENDED);
+
+       /*
+        * Resuming the port will trigger a rescan of the ATA device(s)
+        * connected to it. Before scheduling the rescan, make sure that
+        * the associated scsi device(s) are fully resumed as well.
+        */
+       ata_for_each_link(link, ap, HOST_FIRST) {
+               ata_for_each_dev(dev, link, ENABLED) {
+                       struct scsi_device *sdev = dev->sdev;
+
+                       if (!sdev)
+                               continue;
+                       if (scsi_device_get(sdev))
+                               continue;
+
+                       spin_unlock_irqrestore(ap->lock, flags);
+                       device_pm_wait_for_dev(&ap->tdev,
+                                              &sdev->sdev_gendev);
+                       scsi_device_put(sdev);
+                       spin_lock_irqsave(ap->lock, flags);
+               }
+       }
        spin_unlock_irqrestore(ap->lock, flags);
 }
 #endif /* CONFIG_PM */

Thanks !

-- 
Damien Le Moal
Western Digital Research