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[SCSI] iscsi transport: use atomic for session_nr allocations 

qla4xxx and iscsi_tcp or iser could be creating
sessions at the same time, so make session_nr id
allocation atomic.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Mike Christie 2007-02-28 17:32:18 -06:00 committed by James Bottomley
parent bf32ed33e9
commit 41be144422
1 changed files with 4 additions and 2 deletions
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6
drivers/scsi/scsi_transport_iscsi.c
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@ -49,7 +49,7 @@ struct iscsi_internal {
struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
};
static int iscsi_session_nr; /* sysfs session id for next new session */
static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
/*
* list of registered transports and lock that must
@ -300,7 +300,7 @@ int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
int err;
ihost = shost->shost_data;
session->sid = iscsi_session_nr++;
session->sid = atomic_add_return(1, &iscsi_session_nr);
session->target_id = target_id;
snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u",
@ -1419,6 +1419,8 @@ static __init int iscsi_transport_init(void)
printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
ISCSI_TRANSPORT_VERSION);
atomic_set(&iscsi_session_nr, 0);
err = class_register(&iscsi_transport_class);
if (err)
return err;