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-rw-r--r--block/bsg.c78
1 files changed, 30 insertions, 48 deletions
diff --git a/block/bsg.c b/block/bsg.c
index 3b2f05258a92..d60eee549405 100644
--- a/block/bsg.c
+++ b/block/bsg.c
@@ -9,13 +9,6 @@
* archive for more details.
*
*/
-/*
- * TODO
- * - Should this get merged, block/scsi_ioctl.c will be migrated into
- * this file. To keep maintenance down, it's easier to have them
- * seperated right now.
- *
- */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/file.h>
@@ -24,6 +17,7 @@
#include <linux/cdev.h>
#include <linux/percpu.h>
#include <linux/uio.h>
+#include <linux/idr.h>
#include <linux/bsg.h>
#include <scsi/scsi.h>
@@ -70,13 +64,12 @@ enum {
#endif
static DEFINE_MUTEX(bsg_mutex);
-static int bsg_device_nr, bsg_minor_idx;
+static DEFINE_IDR(bsg_minor_idr);
#define BSG_LIST_ARRAY_SIZE 8
static struct hlist_head bsg_device_list[BSG_LIST_ARRAY_SIZE];
static struct class *bsg_class;
-static LIST_HEAD(bsg_class_list);
static int bsg_major;
static struct kmem_cache *bsg_cmd_cachep;
@@ -92,7 +85,6 @@ struct bsg_command {
struct bio *bidi_bio;
int err;
struct sg_io_v4 hdr;
- struct sg_io_v4 __user *uhdr;
char sense[SCSI_SENSE_BUFFERSIZE];
};
@@ -620,7 +612,6 @@ static int __bsg_write(struct bsg_device *bd, const char __user *buf,
break;
}
- bc->uhdr = (struct sg_io_v4 __user *) buf;
if (copy_from_user(&bc->hdr, buf, sizeof(bc->hdr))) {
ret = -EFAULT;
break;
@@ -781,23 +772,18 @@ static struct bsg_device *__bsg_get_device(int minor)
static struct bsg_device *bsg_get_device(struct inode *inode, struct file *file)
{
- struct bsg_device *bd = __bsg_get_device(iminor(inode));
- struct bsg_class_device *bcd, *__bcd;
+ struct bsg_device *bd;
+ struct bsg_class_device *bcd;
+ bd = __bsg_get_device(iminor(inode));
if (bd)
return bd;
/*
* find the class device
*/
- bcd = NULL;
mutex_lock(&bsg_mutex);
- list_for_each_entry(__bcd, &bsg_class_list, list) {
- if (__bcd->minor == iminor(inode)) {
- bcd = __bcd;
- break;
- }
- }
+ bcd = idr_find(&bsg_minor_idr, iminor(inode));
mutex_unlock(&bsg_mutex);
if (!bcd)
@@ -936,13 +922,12 @@ void bsg_unregister_queue(struct request_queue *q)
return;
mutex_lock(&bsg_mutex);
+ idr_remove(&bsg_minor_idr, bcd->minor);
sysfs_remove_link(&q->kobj, "bsg");
class_device_unregister(bcd->class_dev);
put_device(bcd->dev);
bcd->class_dev = NULL;
bcd->dev = NULL;
- list_del_init(&bcd->list);
- bsg_device_nr--;
mutex_unlock(&bsg_mutex);
}
EXPORT_SYMBOL_GPL(bsg_unregister_queue);
@@ -950,9 +935,9 @@ EXPORT_SYMBOL_GPL(bsg_unregister_queue);
int bsg_register_queue(struct request_queue *q, struct device *gdev,
const char *name)
{
- struct bsg_class_device *bcd, *__bcd;
+ struct bsg_class_device *bcd;
dev_t dev;
- int ret = -EMFILE;
+ int ret, minor;
struct class_device *class_dev = NULL;
const char *devname;
@@ -969,28 +954,26 @@ int bsg_register_queue(struct request_queue *q, struct device *gdev,
bcd = &q->bsg_dev;
memset(bcd, 0, sizeof(*bcd));
- INIT_LIST_HEAD(&bcd->list);
mutex_lock(&bsg_mutex);
- if (bsg_device_nr == BSG_MAX_DEVS) {
- printk(KERN_ERR "bsg: too many bsg devices\n");
- goto err;
- }
-retry:
- list_for_each_entry(__bcd, &bsg_class_list, list) {
- if (__bcd->minor == bsg_minor_idx) {
- bsg_minor_idx++;
- if (bsg_minor_idx == BSG_MAX_DEVS)
- bsg_minor_idx = 0;
- goto retry;
- }
+ ret = idr_pre_get(&bsg_minor_idr, GFP_KERNEL);
+ if (!ret) {
+ ret = -ENOMEM;
+ goto unlock;
}
- bcd->minor = bsg_minor_idx++;
- if (bsg_minor_idx == BSG_MAX_DEVS)
- bsg_minor_idx = 0;
+ ret = idr_get_new(&bsg_minor_idr, bcd, &minor);
+ if (ret < 0)
+ goto unlock;
+ if (minor >= BSG_MAX_DEVS) {
+ printk(KERN_ERR "bsg: too many bsg devices\n");
+ ret = -EINVAL;
+ goto remove_idr;
+ }
+
+ bcd->minor = minor;
bcd->queue = q;
bcd->dev = get_device(gdev);
dev = MKDEV(bsg_major, bcd->minor);
@@ -998,27 +981,26 @@ retry:
devname);
if (IS_ERR(class_dev)) {
ret = PTR_ERR(class_dev);
- goto err_put;
+ goto put_dev;
}
bcd->class_dev = class_dev;
if (q->kobj.sd) {
ret = sysfs_create_link(&q->kobj, &bcd->class_dev->kobj, "bsg");
if (ret)
- goto err_unregister;
+ goto unregister_class_dev;
}
- list_add_tail(&bcd->list, &bsg_class_list);
- bsg_device_nr++;
-
mutex_unlock(&bsg_mutex);
return 0;
-err_unregister:
+unregister_class_dev:
class_device_unregister(class_dev);
-err_put:
+put_dev:
put_device(gdev);
-err:
+remove_idr:
+ idr_remove(&bsg_minor_idr, minor);
+unlock:
mutex_unlock(&bsg_mutex);
return ret;
}