[SCSI] handle scsi_add_host failure for aic7xxx and fix compiler warning

Add scsi_add_host() failure handling for aic7xxx
Also silence a compiler warning :
 drivers/scsi/aic7xxx/aic7xxx_osm.c: In function `ahc_linux_register_host':
 drivers/scsi/aic7xxx/aic7xxx_osm.c:1100: warning: ignoring return value of `scsi_add_host', declared with attribute warn_unused_result

Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 13 insertions, 5 deletions

diff --git a/drivers/scsi/aic7xxx/aic7xxx_osm.c b/drivers/scsi/aic7xxx/aic7xxx_osm.c
index d866213f42b8..fd389e9f9460 100644
--- a/drivers/scsi/aic7xxx/aic7xxx_osm.c
+++ b/drivers/scsi/aic7xxx/aic7xxx_osm.c
@@ -1061,10 +1061,11 @@ uint32_t aic7xxx_verbose;
 int
 ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *template)
 {
-        char     buf[80];
-        struct   Scsi_Host *host;
+        char    buf[80];
+        struct  Scsi_Host *host;
         char    *new_name;
-        u_long   s;
+        u_long  s;
+        int     retval;
 
         template->name = ahc->description;
         host = scsi_host_alloc(template, sizeof(struct ahc_softc *));
@@ -1097,9 +1098,16 @@ ahc_linux_register_host(struct ahc_softc *ahc, struct scsi_host_template *templa
 
         host->transportt = ahc_linux_transport_template;
 
-        scsi_add_host(host, (ahc->dev_softc ? &ahc->dev_softc->dev : NULL)); /* XXX handle failure */
+        retval = scsi_add_host(host,
+                        (ahc->dev_softc ? &ahc->dev_softc->dev : NULL));
+        if (retval) {
+                printk(KERN_WARNING "aic7xxx: scsi_add_host failed\n");
+                scsi_host_put(host);
+                return retval;
+        }
+
         scsi_scan_host(host);
-        return (0);
+        return 0;
 }
 
 /*