config: tegra3: enable /dev mount with ACL
[linux-2.6.git] / drivers / scsi / hosts.c
index 3fdbb13..351dc0b 100644 (file)
@@ -24,6 +24,7 @@
 #include <linux/module.h>
 #include <linux/blkdev.h>
 #include <linux/kernel.h>
+#include <linux/slab.h>
 #include <linux/kthread.h>
 #include <linux/string.h>
 #include <linux/mm.h>
@@ -31,6 +32,7 @@
 #include <linux/completion.h>
 #include <linux/transport_class.h>
 #include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
 
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_host.h>
@@ -40,7 +42,7 @@
 #include "scsi_logging.h"
 
 
-static int scsi_host_next_hn;          /* host_no for next new host */
+static atomic_t scsi_host_next_hn;     /* host_no for next new host */
 
 
 static void scsi_host_cls_release(struct device *dev)
@@ -155,6 +157,7 @@ EXPORT_SYMBOL(scsi_host_set_state);
 void scsi_remove_host(struct Scsi_Host *shost)
 {
        unsigned long flags;
+
        mutex_lock(&shost->scan_mutex);
        spin_lock_irqsave(shost->host_lock, flags);
        if (scsi_host_set_state(shost, SHOST_CANCEL))
@@ -164,8 +167,10 @@ void scsi_remove_host(struct Scsi_Host *shost)
                        return;
                }
        spin_unlock_irqrestore(shost->host_lock, flags);
-       mutex_unlock(&shost->scan_mutex);
+
+       scsi_autopm_get_host(shost);
        scsi_forget_host(shost);
+       mutex_unlock(&shost->scan_mutex);
        scsi_proc_host_rm(shost);
 
        spin_lock_irqsave(shost->host_lock, flags);
@@ -176,19 +181,24 @@ void scsi_remove_host(struct Scsi_Host *shost)
        transport_unregister_device(&shost->shost_gendev);
        device_unregister(&shost->shost_dev);
        device_del(&shost->shost_gendev);
-       scsi_proc_hostdir_rm(shost->hostt);
 }
 EXPORT_SYMBOL(scsi_remove_host);
 
 /**
- * scsi_add_host - add a scsi host
+ * scsi_add_host_with_dma - add a scsi host with dma device
  * @shost:     scsi host pointer to add
  * @dev:       a struct device of type scsi class
+ * @dma_dev:   dma device for the host
+ *
+ * Note: You rarely need to worry about this unless you're in a
+ * virtualised host environments, so use the simpler scsi_add_host()
+ * function instead.
  *
  * Return value: 
  *     0 on success / != 0 for error
  **/
-int scsi_add_host(struct Scsi_Host *shost, struct device *dev)
+int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
+                          struct device *dma_dev)
 {
        struct scsi_host_template *sht = shost->hostt;
        int error = -EINVAL;
@@ -208,14 +218,21 @@ int scsi_add_host(struct Scsi_Host *shost, struct device *dev)
 
        if (!shost->shost_gendev.parent)
                shost->shost_gendev.parent = dev ? dev : &platform_bus;
+       shost->dma_dev = dma_dev;
 
        error = device_add(&shost->shost_gendev);
        if (error)
                goto out;
 
+       pm_runtime_set_active(&shost->shost_gendev);
+       pm_runtime_enable(&shost->shost_gendev);
+       device_enable_async_suspend(&shost->shost_gendev);
+
        scsi_host_set_state(shost, SHOST_RUNNING);
        get_device(shost->shost_gendev.parent);
 
+       device_enable_async_suspend(&shost->shost_dev);
+
        error = device_add(&shost->shost_dev);
        if (error)
                goto out_del_gendev;
@@ -263,20 +280,25 @@ int scsi_add_host(struct Scsi_Host *shost, struct device *dev)
  fail:
        return error;
 }
-EXPORT_SYMBOL(scsi_add_host);
+EXPORT_SYMBOL(scsi_add_host_with_dma);
 
 static void scsi_host_dev_release(struct device *dev)
 {
        struct Scsi_Host *shost = dev_to_shost(dev);
        struct device *parent = dev->parent;
+       struct request_queue *q;
+
+       scsi_proc_hostdir_rm(shost->hostt);
 
        if (shost->ehandler)
                kthread_stop(shost->ehandler);
        if (shost->work_q)
                destroy_workqueue(shost->work_q);
-       if (shost->uspace_req_q) {
-               kfree(shost->uspace_req_q->queuedata);
-               scsi_free_queue(shost->uspace_req_q);
+       q = shost->uspace_req_q;
+       if (q) {
+               kfree(q->queuedata);
+               q->queuedata = NULL;
+               scsi_free_queue(q);
        }
 
        scsi_destroy_command_freelist(shost);
@@ -312,7 +334,6 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
 {
        struct Scsi_Host *shost;
        gfp_t gfp_mask = GFP_KERNEL;
-       int rval;
 
        if (sht->unchecked_isa_dma && privsize)
                gfp_mask |= __GFP_DMA;
@@ -332,7 +353,11 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
 
        mutex_init(&shost->scan_mutex);
 
-       shost->host_no = scsi_host_next_hn++; /* XXX(hch): still racy */
+       /*
+        * subtract one because we increment first then return, but we need to
+        * know what the next host number was before increment
+        */
+       shost->host_no = atomic_inc_return(&scsi_host_next_hn) - 1;
        shost->dma_channel = 0xff;
 
        /* These three are default values which can be overridden */
@@ -354,6 +379,7 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
        shost->this_id = sht->this_id;
        shost->can_queue = sht->can_queue;
        shost->sg_tablesize = sht->sg_tablesize;
+       shost->sg_prot_tablesize = sht->sg_prot_tablesize;
        shost->cmd_per_lun = sht->cmd_per_lun;
        shost->unchecked_isa_dma = sht->unchecked_isa_dma;
        shost->use_clustering = sht->use_clustering;
@@ -388,24 +414,21 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
                shost->dma_boundary = 0xffffffff;
 
        device_initialize(&shost->shost_gendev);
-       snprintf(shost->shost_gendev.bus_id, BUS_ID_SIZE, "host%d",
-               shost->host_no);
-#ifndef CONFIG_SYSFS_DEPRECATED
+       dev_set_name(&shost->shost_gendev, "host%d", shost->host_no);
        shost->shost_gendev.bus = &scsi_bus_type;
-#endif
        shost->shost_gendev.type = &scsi_host_type;
 
        device_initialize(&shost->shost_dev);
        shost->shost_dev.parent = &shost->shost_gendev;
        shost->shost_dev.class = &shost_class;
-       snprintf(shost->shost_dev.bus_id, BUS_ID_SIZE, "host%d",
-                shost->host_no);
+       dev_set_name(&shost->shost_dev, "host%d", shost->host_no);
        shost->shost_dev.groups = scsi_sysfs_shost_attr_groups;
 
        shost->ehandler = kthread_run(scsi_error_handler, shost,
                        "scsi_eh_%d", shost->host_no);
        if (IS_ERR(shost->ehandler)) {
-               rval = PTR_ERR(shost->ehandler);
+               printk(KERN_WARNING "scsi%d: error handler thread failed to spawn, error = %ld\n",
+                       shost->host_no, PTR_ERR(shost->ehandler));
                goto fail_kfree;
        }