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.
---
drivers/scsi/device_handler/scsi_dh.c | 112 +++++++++++----------------------
drivers/scsi/scsi_priv.h | 1 +
include/scsi/scsi_device.h | 1 +
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 6fae3d2..a21136a 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);
@@ -569,6 +526,10 @@ 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)
@@ -583,6 +544,7 @@ 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 ce9e0ad..9868afd 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 85867dc..f171c65 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;
--
1.7.3.1
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