scsi: Use ida for host number management

Update the SCSI hosts module to use ida to manage its host_no index
instead of an atomic integer. This means that the SCSI host number will
now be reclaimable.

Use the ida "simple" mechanism, since there should be no need for a
separate spin lock current usage. Ida was chosen over idr because the
hosts module already has its own instance and locking mechanisms that
aren't easily changed.

Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 14 insertions, 8 deletions

diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index 82ac1cd818ac..94025c5cf797 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -33,7 +33,7 @@
 #include <linux/transport_class.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
-
+#include <linux/idr.h>
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_transport.h>
@@ -42,7 +42,7 @@
 #include "scsi_logging.h"
 
 
-static atomic_t scsi_host_next_hn = ATOMIC_INIT(0);     /* host_no for next new host */
+static DEFINE_IDA(host_index_ida);
 
 
 static void scsi_host_cls_release(struct device *dev)
@@ -355,6 +355,8 @@ static void scsi_host_dev_release(struct device *dev)
 
         kfree(shost->shost_data);
 
+        ida_simple_remove(&host_index_ida, shost->host_no);
+
         if (parent)
                 put_device(parent);
         kfree(shost);
@@ -388,6 +390,7 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
 {
         struct Scsi_Host *shost;
         gfp_t gfp_mask = GFP_KERNEL;
+        int index;
 
         if (sht->unchecked_isa_dma && privsize)
                 gfp_mask |= __GFP_DMA;
@@ -406,11 +409,11 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
         init_waitqueue_head(&shost->host_wait);
         mutex_init(&shost->scan_mutex);
 
-        /*
-         * 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;
+        index = ida_simple_get(&host_index_ida, 0, 0, GFP_KERNEL);
+        if (index < 0)
+                goto fail_kfree;
+        shost->host_no = index;
+
         shost->dma_channel = 0xff;
 
         /* These three are default values which can be overridden */
@@ -495,7 +498,7 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
                 shost_printk(KERN_WARNING, shost,
                         "error handler thread failed to spawn, error = %ld\n",
                         PTR_ERR(shost->ehandler));
-                goto fail_kfree;
+                goto fail_index_remove;
         }
 
         shost->tmf_work_q = alloc_workqueue("scsi_tmf_%d",
@@ -511,6 +514,8 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
 
  fail_kthread:
         kthread_stop(shost->ehandler);
+ fail_index_remove:
+        ida_simple_remove(&host_index_ida, shost->host_no);
  fail_kfree:
         kfree(shost);
         return NULL;
@@ -606,6 +611,7 @@ int scsi_init_hosts(void)
 void scsi_exit_hosts(void)
 {
         class_unregister(&shost_class);
+        ida_destroy(&host_index_ida);
 }
 
 int scsi_is_host_device(const struct device *dev)