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| Started by | Johannes Thumshirn <jthumshirn@suse.de> |
|---|---|
| First post | 2016-03-31 15:00 +0200 |
| Last post | 2016-04-02 18:40 +0200 |
| Articles | 3 — 3 participants |
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[PATCH v3 1/2] scsi: Add intermediate STARGET_REMOVE state to scsi_target_state Johannes Thumshirn <jthumshirn@suse.de> - 2016-03-31 15:00 +0200
Re: [PATCH v3 1/2] scsi: Add intermediate STARGET_REMOVE state to scsi_target_state Hannes Reinecke <hare@suse.de> - 2016-03-31 18:20 +0200
Re: [PATCH v3 1/2] scsi: Add intermediate STARGET_REMOVE state to scsi_target_state James Bottomley <jejb@linux.vnet.ibm.com> - 2016-04-02 18:40 +0200
| From | Johannes Thumshirn <jthumshirn@suse.de> |
|---|---|
| Date | 2016-03-31 15:00 +0200 |
| Subject | [PATCH v3 1/2] scsi: Add intermediate STARGET_REMOVE state to scsi_target_state |
| Message-ID | <riKmC-5a4-3@gated-at.bofh.it> |
Add intermediate STARGET_REMOVE state to scsi_target_state to avoid running
into the BUG_ON() in scsi_target_reap().
This intermediate state is only valid in the path from scsi_remove_target() to
scsi_target_destroy() indicating this target is going to be removed.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Fixes: 40998193560dab6c3ce8d25f4fa58a23e252ef38
---
drivers/scsi/scsi_scan.c | 2 ++
drivers/scsi/scsi_sysfs.c | 2 ++
include/scsi/scsi_device.h | 1 +
3 files changed, 5 insertions(+)
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 6a82066..63b8bca 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -315,6 +315,8 @@ static void scsi_target_destroy(struct scsi_target *starget)
struct Scsi_Host *shost = dev_to_shost(dev->parent);
unsigned long flags;
+ BUG_ON(starget->state != STARGET_REMOVE &&
+ starget->state != STARGET_CREATED);
starget->state = STARGET_DEL;
transport_destroy_device(dev);
spin_lock_irqsave(shost->host_lock, flags);
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 00bc721..0df82e8 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -1279,11 +1279,13 @@ restart:
spin_lock_irqsave(shost->host_lock, flags);
list_for_each_entry(starget, &shost->__targets, siblings) {
if (starget->state == STARGET_DEL ||
+ starget->state == STARGET_REMOVE ||
starget == last_target)
continue;
if (starget->dev.parent == dev || &starget->dev == dev) {
kref_get(&starget->reap_ref);
last_target = starget;
+ starget->state = STARGET_REMOVE;
spin_unlock_irqrestore(shost->host_lock, flags);
__scsi_remove_target(starget);
scsi_target_reap(starget);
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index f63a167..2bffaa6 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -240,6 +240,7 @@ scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
enum scsi_target_state {
STARGET_CREATED = 1,
STARGET_RUNNING,
+ STARGET_REMOVE,
STARGET_DEL,
};
--
1.8.5.6
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| From | Hannes Reinecke <hare@suse.de> |
|---|---|
| Date | 2016-03-31 18:20 +0200 |
| Subject | Re: [PATCH v3 1/2] scsi: Add intermediate STARGET_REMOVE state to scsi_target_state |
| Message-ID | <riNua-7Ia-15@gated-at.bofh.it> |
| In reply to | #1368265 |
On 03/31/2016 02:53 PM, Johannes Thumshirn wrote:
> Add intermediate STARGET_REMOVE state to scsi_target_state to avoid running
> into the BUG_ON() in scsi_target_reap().
>
> This intermediate state is only valid in the path from scsi_remove_target() to
> scsi_target_destroy() indicating this target is going to be removed.
>
> Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
> Fixes: 40998193560dab6c3ce8d25f4fa58a23e252ef38
> ---
> drivers/scsi/scsi_scan.c | 2 ++
> drivers/scsi/scsi_sysfs.c | 2 ++
> include/scsi/scsi_device.h | 1 +
> 3 files changed, 5 insertions(+)
>
> diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
> index 6a82066..63b8bca 100644
> --- a/drivers/scsi/scsi_scan.c
> +++ b/drivers/scsi/scsi_scan.c
> @@ -315,6 +315,8 @@ static void scsi_target_destroy(struct scsi_target *starget)
> struct Scsi_Host *shost = dev_to_shost(dev->parent);
> unsigned long flags;
>
> + BUG_ON(starget->state != STARGET_REMOVE &&
> + starget->state != STARGET_CREATED);
> starget->state = STARGET_DEL;
> transport_destroy_device(dev);
> spin_lock_irqsave(shost->host_lock, flags);
> diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
> index 00bc721..0df82e8 100644
> --- a/drivers/scsi/scsi_sysfs.c
> +++ b/drivers/scsi/scsi_sysfs.c
> @@ -1279,11 +1279,13 @@ restart:
> spin_lock_irqsave(shost->host_lock, flags);
> list_for_each_entry(starget, &shost->__targets, siblings) {
> if (starget->state == STARGET_DEL ||
> + starget->state == STARGET_REMOVE ||
> starget == last_target)
> continue;
> if (starget->dev.parent == dev || &starget->dev == dev) {
> kref_get(&starget->reap_ref);
> last_target = starget;
> + starget->state = STARGET_REMOVE;
> spin_unlock_irqrestore(shost->host_lock, flags);
> __scsi_remove_target(starget);
> scsi_target_reap(starget);
> diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
> index f63a167..2bffaa6 100644
> --- a/include/scsi/scsi_device.h
> +++ b/include/scsi/scsi_device.h
> @@ -240,6 +240,7 @@ scmd_printk(const char *, const struct scsi_cmnd *, const char *, ...);
> enum scsi_target_state {
> STARGET_CREATED = 1,
> STARGET_RUNNING,
> + STARGET_REMOVE,
> STARGET_DEL,
> };
>
>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@suse.de +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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| From | James Bottomley <jejb@linux.vnet.ibm.com> |
|---|---|
| Date | 2016-04-02 18:40 +0200 |
| Subject | Re: [PATCH v3 1/2] scsi: Add intermediate STARGET_REMOVE state to scsi_target_state |
| Message-ID | <rjwKD-6wn-31@gated-at.bofh.it> |
| In reply to | #1368265 |
On Thu, 2016-03-31 at 14:53 +0200, Johannes Thumshirn wrote: > Add intermediate STARGET_REMOVE state to scsi_target_state to avoid > running > into the BUG_ON() in scsi_target_reap(). > > This intermediate state is only valid in the path from > scsi_remove_target() to > scsi_target_destroy() indicating this target is going to be removed. > > Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de> > Fixes: 40998193560dab6c3ce8d25f4fa58a23e252ef38 The code and ordering is fine with me, so you can add Reviewed-by: James Bottomley <jejb@linux.vnet.ibm.com> However, I'd really appreciate it if the description of what was going on was clearer for a non-SUSE distro maintainer. What we're doing is applying a more comprehensive fix for a previously hack fixed problem and then reverting the hack. I think message 1 should say "this refixes the problem introduced by commit X in a more comprehensive way" and message 2 "Now that we've done a more comprehensive fix with the intermediate target state in patch Y, we can remove the previous hack" James
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