[SCSI] scsi_scan: Cope with kthread_run failing

If kthread_run failed, we would fail to scan the host, and leak the
allocated async_scan_data.  Since using a separate thread is just an
optimisation, do the scan synchronously if we fail to spawn a thread.

Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 20df7fe4f48fe05a694a780a2e2b218235841da9..b53c5f67e372684cc23c81a9f0ce19a41109e1ac 100644 (file)
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -1799,6 +1799,7 @@ static int do_scan_async(void *_data)
  **/
 void scsi_scan_host(struct Scsi_Host *shost)
 {
+       struct task_struct *p;
        struct async_scan_data *data;
 
        if (strncmp(scsi_scan_type, "none", 4) == 0)
@@ -1810,7 +1811,9 @@ void scsi_scan_host(struct Scsi_Host *shost)
                return;
        }
 
-       kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no);
+       p = kthread_run(do_scan_async, data, "scsi_scan_%d", shost->host_no);
+       if (unlikely(IS_ERR(p)))
+               do_scan_async(data);
 }
 EXPORT_SYMBOL(scsi_scan_host);