lkml.org 
[lkml]   [2015]   [Oct]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/3] SCSI: Rework list handling in scsi_target_remove
Date
Rework the list handling in scsi_target_remove(). The new version introduces a
reap list for targets. Targets that shall be removed are placed on the reap
list and can then be reaped later on.

Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
---
drivers/scsi/scsi_sysfs.c | 19 ++++++++-----------
1 file changed, 8 insertions(+), 11 deletions(-)

diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index d7afea9..b41dcb3 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -1156,31 +1156,28 @@ static void __scsi_remove_target(struct scsi_target *starget)
void scsi_remove_target(struct device *dev)
{
struct Scsi_Host *shost = dev_to_shost(dev->parent);
- struct scsi_target *starget, *last = NULL;
+ struct scsi_target *starget, *tmp;
unsigned long flags;
+ LIST_HEAD(reap_list);

/* remove targets being careful to lookup next entry before
* deleting the last
*/
spin_lock_irqsave(&shost->target_lock, flags);
- list_for_each_entry(starget, &shost->__targets, siblings) {
+ list_for_each_entry_safe(starget, tmp, &shost->__targets, siblings) {
if (starget->state == STARGET_DEL)
continue;
if (starget->dev.parent == dev || &starget->dev == dev) {
- /* assuming new targets arrive at the end */
kref_get(&starget->reap_ref);
- spin_unlock_irqrestore(&shost->target_lock, flags);
- if (last)
- scsi_target_reap(last);
- last = starget;
- __scsi_remove_target(starget);
- spin_lock_irqsave(&shost->target_lock, flags);
+ list_move_tail(&starget->siblings, &reap_list);
}
}
spin_unlock_irqrestore(&shost->target_lock, flags);

- if (last)
- scsi_target_reap(last);
+ list_for_each_entry_safe(starget, tmp, &reap_list, siblings) {
+ __scsi_remove_target(starget);
+ scsi_target_reap(starget);
+ }
}
EXPORT_SYMBOL(scsi_remove_target);

--
1.8.5.6


\
 
 \ /
  Last update: 2015-10-14 16:01    [W:0.153 / U:0.320 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site