On 06/29/2013 02:51 AM, Kamal Mostafa wrote: > 3.8.13.4 -stable review patch. If anyone has any objections, please let me > know. > > ------------------ > > From: Aaron Lu <[email protected]> > > commit 44521527be36172864e6e7a6fba4b66e9aa48e40 upstream. > > Commit 30dcf76acc69 "libata: migrate ACPI code over to new bindings" > mistakenly dropped the code to register hotplug notificaion handler > for ATA port/devices, causing regression for people using ATA bay, > as kernel bug #59871 shows. > > Fix this by adding back the hotplug notification handler registration > code. Since this code has to be run once and notification needs to > be installed on every ATA port/devices handle no matter if there is > actual device attached, we can't do this in binding time for ATA > device ACPI handle, as the binding only occurs when a SCSI device is > created, i.e. there is device attached. So introduce the > ata_acpi_hotplug_init() function to loop scan all ATA ACPI handles > and if it is available, install the notificaion handler for it during > ATA init time. > > With the ATA ACPI handle binding to SCSI device tree, it is possible > now that when the SCSI hotplug work removes the SCSI device, the ACPI > unbind function will find that the corresponding ACPI device has > already been deleted by dock driver, causing a scaring message like: > [ 128.263966] scsi 4:0:0:0: Oops, 'acpi_handle' corrupt > Fix this by waiting for SCSI hotplug task finish in our notificaion > handler, so that the removal of ACPI device done in ACPI unbind > function triggered by the removal of SCSI device is run earlier when > ACPI device is still available. > > [rjw: Rebased] > References: https://bugzilla.kernel.org/show_bug.cgi?id=59871 > Reported-bisected-and-tested-by: Dirk Griesbach <[email protected]> > Signed-off-by: Aaron Lu <[email protected]> > Acked-by: Tejun Heo <[email protected]> > Signed-off-by: Rafael J. Wysocki <[email protected]> > [ kamal: backport to 3.8 ]
Cool, thanks for the backport, I should have noticed this change of API. I'll be more careful next time. BTW, the backport looks good to me. Thanks, Aaron > Signed-off-by: Kamal Mostafa <[email protected]> > --- > drivers/ata/libata-acpi.c | 36 +++++++++++++++++++++++++++++++++++- > drivers/ata/libata-core.c | 2 ++ > drivers/ata/libata.h | 2 ++ > 3 files changed, 39 insertions(+), 1 deletion(-) > > diff --git a/drivers/ata/libata-acpi.c b/drivers/ata/libata-acpi.c > index cc8aa9e..4cdeee4 100644 > --- a/drivers/ata/libata-acpi.c > +++ b/drivers/ata/libata-acpi.c > @@ -156,8 +156,10 @@ static void ata_acpi_handle_hotplug(struct ata_port *ap, > struct ata_device *dev, > > spin_unlock_irqrestore(ap->lock, flags); > > - if (wait) > + if (wait) { > ata_port_wait_eh(ap); > + flush_work(&ap->hotplug_task.work); > + } > } > > static void ata_acpi_dev_notify_dock(acpi_handle handle, u32 event, void > *data) > @@ -214,6 +216,38 @@ static const struct acpi_dock_ops ata_acpi_ap_dock_ops = > { > .uevent = ata_acpi_ap_uevent, > }; > > +void ata_acpi_hotplug_init(struct ata_host *host) > +{ > + int i; > + > + for (i = 0; i < host->n_ports; i++) { > + struct ata_port *ap = host->ports[i]; > + acpi_handle handle; > + struct ata_device *dev; > + > + if (!ap) > + continue; > + > + handle = ata_ap_acpi_handle(ap); > + if (handle) { > + /* we might be on a docking station */ > + register_hotplug_dock_device(handle, > + &ata_acpi_ap_dock_ops, ap); > + } > + > + ata_for_each_dev(dev, &ap->link, ALL) { > + handle = ata_dev_acpi_handle(dev); > + if (!handle) > + continue; > + > + /* we might be on a docking station */ > + register_hotplug_dock_device(handle, > + &ata_acpi_dev_dock_ops, > + dev); > + } > + } > +} > + > /** > * ata_acpi_dissociate - dissociate ATA host from ACPI objects > * @host: target ATA host > diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c > index 3b3afa8..5866bf5 100644 > --- a/drivers/ata/libata-core.c > +++ b/drivers/ata/libata-core.c > @@ -6124,6 +6124,8 @@ int ata_host_register(struct ata_host *host, struct > scsi_host_template *sht) > if (rc) > goto err_tadd; > > + ata_acpi_hotplug_init(host); > + > /* set cable, sata_spd_limit and report */ > for (i = 0; i < host->n_ports; i++) { > struct ata_port *ap = host->ports[i]; > diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h > index 7148a58..15ac13f 100644 > --- a/drivers/ata/libata.h > +++ b/drivers/ata/libata.h > @@ -122,6 +122,7 @@ extern int ata_acpi_register(void); > extern void ata_acpi_unregister(void); > extern void ata_acpi_bind(struct ata_device *dev); > extern void ata_acpi_unbind(struct ata_device *dev); > +extern void ata_acpi_hotplug_init(struct ata_host *host); > #else > static inline void ata_acpi_dissociate(struct ata_host *host) { } > static inline int ata_acpi_on_suspend(struct ata_port *ap) { return 0; } > @@ -134,6 +135,7 @@ static inline int ata_acpi_register(void) { return 0; } > static inline void ata_acpi_unregister(void) { } > static inline void ata_acpi_bind(struct ata_device *dev) { } > static inline void ata_acpi_unbind(struct ata_device *dev) { } > +static inline void ata_acpi_hotplug_init(struct ata_host *host) {} > #endif > > /* libata-scsi.c */ > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
