[SCSI] aic7xxx/aic79xx: fix module removal path not to panic

In these drivers, scsi_remove_host() is called too late, at the point
it is called, the driver has already shut down too far to accept any
I/O that the shutdown might generate.  Any generated I/O actually
triggers a panic.

Fix this by calling scsi_remove_host() as early as possible and not
calling scsi_host_put() until just before we kfree the ahc_softc.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 3 insertions, 5 deletions

diff --git a/drivers/scsi/aic7xxx/aic79xx_osm.c b/drivers/scsi/aic7xxx/aic79xx_osm.c
index 6b6d4e287793..95c285cc83e4 100644
--- a/drivers/scsi/aic7xxx/aic79xx_osm.c
+++ b/drivers/scsi/aic7xxx/aic79xx_osm.c
@@ -1192,11 +1192,6 @@ ahd_platform_free(struct ahd_softc *ahd)
         int i, j;
 
         if (ahd->platform_data != NULL) {
-                if (ahd->platform_data->host != NULL) {
-                        scsi_remove_host(ahd->platform_data->host);
-                        scsi_host_put(ahd->platform_data->host);
-                }
-
                 /* destroy all of the device and target objects */
                 for (i = 0; i < AHD_NUM_TARGETS; i++) {
                         starget = ahd->platform_data->starget[i];
@@ -1226,6 +1221,9 @@ ahd_platform_free(struct ahd_softc *ahd)
                         release_mem_region(ahd->platform_data->mem_busaddr,
                                            0x1000);
                 }
+                if (ahd->platform_data->host)
+                        scsi_host_put(ahd->platform_data->host);
+
                 free(ahd->platform_data, M_DEVBUF);
         }
 }