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authorJames.Smart@Emulex.Com <James.Smart@Emulex.Com>2005-06-10 22:24:30 -0400
committerJames Bottomley <jejb@mulgrave.(none)>2005-08-08 17:14:55 -0500
commit5c44cd2afad3f7b015542187e147a820600172f1 (patch)
treeef4b63ee55d0481569b1bd680e376b0d94b2b6f0 /drivers
parent9c472dd9197429a37691e91c938660a062bf20b0 (diff)
downloadop-kernel-dev-5c44cd2afad3f7b015542187e147a820600172f1.zip
op-kernel-dev-5c44cd2afad3f7b015542187e147a820600172f1.tar.gz
[SCSI] fix target scanning oops with fc transport class
We have some nasty issues with 2.6.12-rc6. Any request to scan on the lpfc or qla2xxx FC adapters will oops. What is happening is the system is defaulting to non-transport registered targets, which inherit the parent of the scan. On this second scan, performed by the attribute, the parent becomes the shost instead of the rport. The slave functions in the 2 FC adapters use starget_to_rport() routines, which incorrectly map the shost as an rport pointer. Additionally, this pointed out other weaknesses: - If the target structure is torn down outside of the transport, we have no method for it to be regenerated at the proper parent. - We have race conditions on the target being allocated by both the midlayer scan (parent=shost) and by the fc transport (parent=rport). Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/scsi/scsi_scan.c16
-rw-r--r--drivers/scsi/scsi_transport_fc.c19
2 files changed, 34 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 2d3c4ac4..48edd67 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -336,9 +336,23 @@ static struct scsi_target *scsi_alloc_target(struct device *parent,
unsigned long flags;
const int size = sizeof(struct scsi_target)
+ shost->transportt->target_size;
- struct scsi_target *starget = kmalloc(size, GFP_ATOMIC);
+ struct scsi_target *starget;
struct scsi_target *found_target;
+ /*
+ * Obtain the real parent from the transport. The transport
+ * is allowed to fail (no error) if there is nothing at that
+ * target id.
+ */
+ if (shost->transportt->target_parent) {
+ spin_lock_irqsave(shost->host_lock, flags);
+ parent = shost->transportt->target_parent(shost, channel, id);
+ spin_unlock_irqrestore(shost->host_lock, flags);
+ if (!parent)
+ return NULL;
+ }
+
+ starget = kmalloc(size, GFP_KERNEL);
if (!starget) {
printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__);
return NULL;
diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index 35d1c1e..e6412fc 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -1022,6 +1022,23 @@ static int fc_rport_match(struct attribute_container *cont,
return &i->rport_attr_cont.ac == cont;
}
+
+/*
+ * Must be called with shost->host_lock held
+ */
+static struct device *fc_target_parent(struct Scsi_Host *shost,
+ int channel, uint id)
+{
+ struct fc_rport *rport;
+
+ list_for_each_entry(rport, &fc_host_rports(shost), peers)
+ if ((rport->channel == channel) &&
+ (rport->scsi_target_id == id))
+ return &rport->dev;
+
+ return NULL;
+}
+
struct scsi_transport_template *
fc_attach_transport(struct fc_function_template *ft)
{
@@ -1057,6 +1074,8 @@ fc_attach_transport(struct fc_function_template *ft)
/* Transport uses the shost workq for scsi scanning */
i->t.create_work_queue = 1;
+
+ i->t.target_parent = fc_target_parent;
/*
* Setup SCSI Target Attributes.
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