[SCSI] scsi_dh: Use scsi_devinfo functions to do matching of device_handler tables.

Previously we were using strncmp in order to avoid having to include
whitespace in the devlist, but this means "HSV1000" matches a device
list entry that says "HSV100", which is wrong.  This patch changes
scsi_dh.c to use scsi_devinfo's matching functions instead, since they
handle these cases correctly.

Signed-off-by: James Bottomley <James.Bottomley@suse.de>

3 files changed, 39 insertions, 75 deletions

diff --git a/drivers/scsi/device_handler/scsi_dh.c b/drivers/scsi/device_handler/scsi_dh.c
index b837c5b3c8f9..564e6ecd17c2 100644
--- a/drivers/scsi/device_handler/scsi_dh.c
+++ b/drivers/scsi/device_handler/scsi_dh.c
@@ -25,16 +25,9 @@
 #include <scsi/scsi_dh.h>
 #include "../scsi_priv.h"
 
-struct scsi_dh_devinfo_list {
-        struct list_head node;
-        char vendor[9];
-        char model[17];
-        struct scsi_device_handler *handler;
-};
-
 static DEFINE_SPINLOCK(list_lock);
 static LIST_HEAD(scsi_dh_list);
-static LIST_HEAD(scsi_dh_dev_list);
+static int scsi_dh_list_idx = 1;
 
 static struct scsi_device_handler *get_device_handler(const char *name)
 {
@@ -51,40 +44,18 @@ static struct scsi_device_handler *get_device_handler(const char *name)
         return found;
 }
 
-
-static struct scsi_device_handler *
-scsi_dh_cache_lookup(struct scsi_device *sdev)
+static struct scsi_device_handler *get_device_handler_by_idx(int idx)
 {
-        struct scsi_dh_devinfo_list *tmp;
-        struct scsi_device_handler *found_dh = NULL;
+        struct scsi_device_handler *tmp, *found = NULL;
 
         spin_lock(&list_lock);
-        list_for_each_entry(tmp, &scsi_dh_dev_list, node) {
-                if (!strncmp(sdev->vendor, tmp->vendor, strlen(tmp->vendor)) &&
-                    !strncmp(sdev->model, tmp->model, strlen(tmp->model))) {
-                        found_dh = tmp->handler;
+        list_for_each_entry(tmp, &scsi_dh_list, list) {
+                if (tmp->idx == idx) {
+                        found = tmp;
                         break;
                 }
         }
         spin_unlock(&list_lock);
-
-        return found_dh;
-}
-
-static int scsi_dh_handler_lookup(struct scsi_device_handler *scsi_dh,
-                                  struct scsi_device *sdev)
-{
-        int i, found = 0;
-
-        for(i = 0; scsi_dh->devlist[i].vendor; i++) {
-                if (!strncmp(sdev->vendor, scsi_dh->devlist[i].vendor,
-                             strlen(scsi_dh->devlist[i].vendor)) &&
-                    !strncmp(sdev->model, scsi_dh->devlist[i].model,
-                             strlen(scsi_dh->devlist[i].model))) {
-                        found = 1;
-                        break;
-                }
-        }
         return found;
 }
 
@@ -102,41 +73,14 @@ device_handler_match(struct scsi_device_handler *scsi_dh,
                      struct scsi_device *sdev)
 {
         struct scsi_device_handler *found_dh = NULL;
-        struct scsi_dh_devinfo_list *tmp;
+        int idx;
 
-        found_dh = scsi_dh_cache_lookup(sdev);
-        if (found_dh)
-                return found_dh;
+        idx = scsi_get_device_flags_keyed(sdev, sdev->vendor, sdev->model,
+                                          SCSI_DEVINFO_DH);
+        found_dh = get_device_handler_by_idx(idx);
 
-        if (scsi_dh) {
-                if (scsi_dh_handler_lookup(scsi_dh, sdev))
-                        found_dh = scsi_dh;
-        } else {
-                struct scsi_device_handler *tmp_dh;
-
-                spin_lock(&list_lock);
-                list_for_each_entry(tmp_dh, &scsi_dh_list, list) {
-                        if (scsi_dh_handler_lookup(tmp_dh, sdev))
-                                found_dh = tmp_dh;
-                }
-                spin_unlock(&list_lock);
-        }
-
-        if (found_dh) { /* If device is found, add it to the cache */
-                tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
-                if (tmp) {
-                        strncpy(tmp->vendor, sdev->vendor, 8);
-                        strncpy(tmp->model, sdev->model, 16);
-                        tmp->vendor[8] = '\0';
-                        tmp->model[16] = '\0';
-                        tmp->handler = found_dh;
-                        spin_lock(&list_lock);
-                        list_add(&tmp->node, &scsi_dh_dev_list);
-                        spin_unlock(&list_lock);
-                } else {
-                        found_dh = NULL;
-                }
-        }
+        if (scsi_dh && found_dh != scsi_dh)
+                found_dh = NULL;
 
         return found_dh;
 }
@@ -373,12 +317,25 @@ static int scsi_dh_notifier_remove(struct device *dev, void *data)
  */
 int scsi_register_device_handler(struct scsi_device_handler *scsi_dh)
 {
+        int i;
+
         if (get_device_handler(scsi_dh->name))
                 return -EBUSY;
 
         spin_lock(&list_lock);
+        scsi_dh->idx = scsi_dh_list_idx++;
         list_add(&scsi_dh->list, &scsi_dh_list);
         spin_unlock(&list_lock);
+
+        for (i = 0; scsi_dh->devlist[i].vendor; i++) {
+                scsi_dev_info_list_add_keyed(0,
+                                        scsi_dh->devlist[i].vendor,
+                                        scsi_dh->devlist[i].model,
+                                        NULL,
+                                        scsi_dh->idx,
+                                        SCSI_DEVINFO_DH);
+        }
+
         bus_for_each_dev(&scsi_bus_type, NULL, scsi_dh, scsi_dh_notifier_add);
         printk(KERN_INFO "%s: device handler registered\n", scsi_dh->name);
 
@@ -395,7 +352,7 @@ EXPORT_SYMBOL_GPL(scsi_register_device_handler);
  */
 int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh)
 {
-        struct scsi_dh_devinfo_list *tmp, *pos;
+        int i;
 
         if (!get_device_handler(scsi_dh->name))
                 return -ENODEV;
@@ -403,14 +360,14 @@ int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh)
         bus_for_each_dev(&scsi_bus_type, NULL, scsi_dh,
                          scsi_dh_notifier_remove);
 
+        for (i = 0; scsi_dh->devlist[i].vendor; i++) {
+                scsi_dev_info_list_del_keyed(scsi_dh->devlist[i].vendor,
+                                             scsi_dh->devlist[i].model,
+                                             SCSI_DEVINFO_DH);
+        }
+
         spin_lock(&list_lock);
         list_del(&scsi_dh->list);
-        list_for_each_entry_safe(pos, tmp, &scsi_dh_dev_list, node) {
-                if (pos->handler == scsi_dh) {
-                        list_del(&pos->node);
-                        kfree(pos);
-                }
-        }
         spin_unlock(&list_lock);
         printk(KERN_INFO "%s: device handler unregistered\n", scsi_dh->name);
 
@@ -576,6 +533,10 @@ static int __init scsi_dh_init(void)
 {
         int r;
 
+        r = scsi_dev_info_add_list(SCSI_DEVINFO_DH, "SCSI Device Handler");
+        if (r)
+                return r;
+
         r = bus_register_notifier(&scsi_bus_type, &scsi_dh_nb);
 
         if (!r)
@@ -590,6 +551,7 @@ static void __exit scsi_dh_exit(void)
         bus_for_each_dev(&scsi_bus_type, NULL, NULL,
                          scsi_dh_sysfs_attr_remove);
         bus_unregister_notifier(&scsi_bus_type, &scsi_dh_nb);
+        scsi_dev_info_remove_list(SCSI_DEVINFO_DH);
 }
 
 module_init(scsi_dh_init);
diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h
index ce9e0adc8df8..9868afdb24e2 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -45,6 +45,7 @@ static inline void scsi_log_completion(struct scsi_cmnd *cmd, int disposition)
 enum {
         SCSI_DEVINFO_GLOBAL = 0,
         SCSI_DEVINFO_SPI,
+        SCSI_DEVINFO_DH,
 };
 
 extern int scsi_get_device_flags(struct scsi_device *sdev,
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 85867dcde335..f171c65dc5a8 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -184,6 +184,7 @@ typedef void (*activate_complete)(void *, int);
 struct scsi_device_handler {
         /* Used by the infrastructure */
         struct list_head list; /* list of scsi_device_handlers */
+        int idx;
 
         /* Filled by the hardware handler */
         struct module *module;