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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>
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1 changed files with 4 additions and 2 deletions
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@ -49,7 +49,7 @@ struct iscsi_internal {
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struct class_device_attribute *session_attrs[ISCSI_SESSION_ATTRS + 1];
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};
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static int iscsi_session_nr; /* sysfs session id for next new session */
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static atomic_t iscsi_session_nr; /* sysfs session id for next new session */
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/*
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* list of registered transports and lock that must
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@ -300,7 +300,7 @@ int iscsi_add_session(struct iscsi_cls_session *session, unsigned int target_id)
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int err;
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ihost = shost->shost_data;
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session->sid = iscsi_session_nr++;
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session->sid = atomic_add_return(1, &iscsi_session_nr);
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session->target_id = target_id;
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snprintf(session->dev.bus_id, BUS_ID_SIZE, "session%u",
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@ -1419,6 +1419,8 @@ static __init int iscsi_transport_init(void)
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printk(KERN_INFO "Loading iSCSI transport class v%s.\n",
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ISCSI_TRANSPORT_VERSION);
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atomic_set(&iscsi_session_nr, 0);
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err = class_register(&iscsi_transport_class);
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if (err)
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return err;
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