mlx4_en: Fix a kernel panic when waking tx queue

[safe/jmp/linux-2.6] / drivers / mtd / mtd_blkdevs.c

diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 9ff007c..a49a9c8 100644 (file)
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -32,6 +32,14 @@ struct mtd_blkcore_priv {
        spinlock_t queue_lock;
 };
 
+static int blktrans_discard_request(struct request_queue *q,
+                                   struct request *req)
+{
+       req->cmd_type = REQ_TYPE_LINUX_BLOCK;
+       req->cmd[0] = REQ_LB_OP_DISCARD;
+       return 0;
+}
+
 static int do_blktrans_request(struct mtd_blktrans_ops *tr,
                               struct mtd_blktrans_dev *dev,
                               struct request *req)
@@ -44,6 +52,10 @@ static int do_blktrans_request(struct mtd_blktrans_ops *tr,
 
        buf = req->buffer;
 
+       if (req->cmd_type == REQ_TYPE_LINUX_BLOCK &&
+           req->cmd[0] == REQ_LB_OP_DISCARD)
+               return !tr->discard(dev, block, nsect);
+
        if (!blk_fs_request(req))
                return 0;
 
@@ -121,15 +133,12 @@ static void mtd_blktrans_request(struct request_queue *rq)
 }
 
 
-static int blktrans_open(struct inode *i, struct file *f)
+static int blktrans_open(struct block_device *bdev, fmode_t mode)
 {
-       struct mtd_blktrans_dev *dev;
-       struct mtd_blktrans_ops *tr;
+       struct mtd_blktrans_dev *dev = bdev->bd_disk->private_data;
+       struct mtd_blktrans_ops *tr = dev->tr;
        int ret = -ENODEV;
 
-       dev = i->i_bdev->bd_disk->private_data;
-       tr = dev->tr;
-
        if (!try_module_get(dev->mtd->owner))
                goto out;
 
@@ -152,15 +161,12 @@ static int blktrans_open(struct inode *i, struct file *f)
        return ret;
 }
 
-static int blktrans_release(struct inode *i, struct file *f)
+static int blktrans_release(struct gendisk *disk, fmode_t mode)
 {
-       struct mtd_blktrans_dev *dev;
-       struct mtd_blktrans_ops *tr;
+       struct mtd_blktrans_dev *dev = disk->private_data;
+       struct mtd_blktrans_ops *tr = dev->tr;
        int ret = 0;
 
-       dev = i->i_bdev->bd_disk->private_data;
-       tr = dev->tr;
-
        if (tr->release)
                ret = tr->release(dev);
 
@@ -182,10 +188,10 @@ static int blktrans_getgeo(struct block_device *bdev, struct hd_geometry *geo)
        return -ENOTTY;
 }
 
-static int blktrans_ioctl(struct inode *inode, struct file *file,
+static int blktrans_ioctl(struct block_device *bdev, fmode_t mode,
                              unsigned int cmd, unsigned long arg)
 {
-       struct mtd_blktrans_dev *dev = inode->i_bdev->bd_disk->private_data;
+       struct mtd_blktrans_dev *dev = bdev->bd_disk->private_data;
        struct mtd_blktrans_ops *tr = dev->tr;
 
        switch (cmd) {
@@ -203,7 +209,7 @@ static struct block_device_operations mtd_blktrans_ops = {
        .owner          = THIS_MODULE,
        .open           = blktrans_open,
        .release        = blktrans_release,
-       .ioctl          = blktrans_ioctl,
+       .locked_ioctl   = blktrans_ioctl,
        .getgeo         = blktrans_getgeo,
 };
 
@@ -280,6 +286,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
        gd->private_data = new;
        new->blkcore_priv = gd;
        gd->queue = tr->blkcore_priv->rq;
+       gd->driverfs_dev = new->mtd->dev.parent;
 
        if (new->readonly)
                set_disk_ro(gd, 1);
@@ -367,16 +374,21 @@ int register_mtd_blktrans(struct mtd_blktrans_ops *tr)
 
        tr->blkcore_priv->rq->queuedata = tr;
        blk_queue_hardsect_size(tr->blkcore_priv->rq, tr->blksize);
+       if (tr->discard)
+               blk_queue_set_discard(tr->blkcore_priv->rq,
+                                     blktrans_discard_request);
+
        tr->blkshift = ffs(tr->blksize) - 1;
 
        tr->blkcore_priv->thread = kthread_run(mtd_blktrans_thread, tr,
                        "%sd", tr->name);
        if (IS_ERR(tr->blkcore_priv->thread)) {
+               int ret = PTR_ERR(tr->blkcore_priv->thread);
                blk_cleanup_queue(tr->blkcore_priv->rq);
                unregister_blkdev(tr->major, tr->name);
                kfree(tr->blkcore_priv);
                mutex_unlock(&mtd_table_mutex);
-               return PTR_ERR(tr->blkcore_priv->thread);
+               return ret;
        }
 
        INIT_LIST_HEAD(&tr->devs);