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

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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>
This commit is contained in:
Peter Jones 2011-01-06 15:38:24 -05:00 committed by James Bottomley
parent 38a039be2e
commit 940d7faa48
3 changed files with 39 additions and 75 deletions
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112
drivers/scsi/device_handler/scsi_dh.c
View file

@ -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);

1
drivers/scsi/scsi_priv.h
View file

@ -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,

1
include/scsi/scsi_device.h
View file

@ -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;