1 files changed, 50 insertions, 4 deletions

diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 939de0de18bc..67a38a1409ba 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -276,8 +276,22 @@ static int scsi_bus_match(struct device *dev, struct device_driver *gendrv)
         return (sdp->inq_periph_qual == SCSI_INQ_PQ_CON)? 1: 0;
 }
 
+static int scsi_bus_uevent(struct device *dev, char **envp, int num_envp,
+                           char *buffer, int buffer_size)
+{
+        struct scsi_device *sdev = to_scsi_device(dev);
+        int i = 0;
+        int length = 0;
+
+        add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &length,
+                       "MODALIAS=" SCSI_DEVICE_MODALIAS_FMT, sdev->type);
+        envp[i] = NULL;
+        return 0;
+}
+
 static int scsi_bus_suspend(struct device * dev, pm_message_t state)
 {
+        struct device_driver *drv = dev->driver;
         struct scsi_device *sdev = to_scsi_device(dev);
         struct scsi_host_template *sht = sdev->host->hostt;
         int err;
@@ -286,28 +300,51 @@ static int scsi_bus_suspend(struct device * dev, pm_message_t state)
         if (err)
                 return err;
 
-        if (sht->suspend)
+        /* call HLD suspend first */
+        if (drv && drv->suspend) {
+                err = drv->suspend(dev, state);
+                if (err)
+                        return err;
+        }
+
+        /* then, call host suspend */
+        if (sht->suspend) {
                 err = sht->suspend(sdev, state);
+                if (err) {
+                        if (drv && drv->resume)
+                                drv->resume(dev);
+                        return err;
+                }
+        }
 
-        return err;
+        return 0;
 }
 
 static int scsi_bus_resume(struct device * dev)
 {
+        struct device_driver *drv = dev->driver;
         struct scsi_device *sdev = to_scsi_device(dev);
         struct scsi_host_template *sht = sdev->host->hostt;
-        int err = 0;
+        int err = 0, err2 = 0;
 
+        /* call host resume first */
         if (sht->resume)
                 err = sht->resume(sdev);
 
+        /* then, call HLD resume */
+        if (drv && drv->resume)
+                err2 = drv->resume(dev);
+
         scsi_device_resume(sdev);
-        return err;
+
+        /* favor LLD failure */
+        return err ? err : err2;;
 }
 
 struct bus_type scsi_bus_type = {
         .name           = "scsi",
         .match          = scsi_bus_match,
+        .uevent         = scsi_bus_uevent,
         .suspend        = scsi_bus_suspend,
         .resume         = scsi_bus_resume,
 };
@@ -547,6 +584,14 @@ show_sdev_iostat(iorequest_cnt);
 show_sdev_iostat(iodone_cnt);
 show_sdev_iostat(ioerr_cnt);
 
+static ssize_t
+sdev_show_modalias(struct device *dev, struct device_attribute *attr, char *buf)
+{
+        struct scsi_device *sdev;
+        sdev = to_scsi_device(dev);
+        return snprintf (buf, 20, SCSI_DEVICE_MODALIAS_FMT "\n", sdev->type);
+}
+static DEVICE_ATTR(modalias, S_IRUGO, sdev_show_modalias, NULL);
 
 /* Default template for device attributes.  May NOT be modified */
 static struct device_attribute *scsi_sysfs_sdev_attrs[] = {
@@ -566,6 +611,7 @@ static struct device_attribute *scsi_sysfs_sdev_attrs[] = {
         &dev_attr_iorequest_cnt,
         &dev_attr_iodone_cnt,
         &dev_attr_ioerr_cnt,
+        &dev_attr_modalias,
         NULL
 };