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Subject[PATCH v2 02/18] IB/uverbs: remove dev_table
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dev_table's raison d'etre was to associate an inode back to a
struct ib_uverbs_device.

However, now that we've converted ib_uverbs_device to contain
an embedded cdev (instead of a *cdev), we can use the container_of()
macro and cast back to the containing device.

There's no longer any need for dev_table, so get rid of it.

Signed-off-by: Alex Chiang <achiang@hp.com>
---
drivers/infiniband/core/uverbs_main.c | 24 +++++-------------------
1 files changed, 5 insertions(+), 19 deletions(-)
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index 5da9a73..3f11292 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -74,7 +74,6 @@ DEFINE_IDR(ib_uverbs_qp_idr);
DEFINE_IDR(ib_uverbs_srq_idr);

static DEFINE_SPINLOCK(map_lock);
-static struct ib_uverbs_device *dev_table[IB_UVERBS_MAX_DEVICES];
static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);

static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
@@ -616,14 +615,12 @@ static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
/*
* ib_uverbs_open() does not need the BKL:
*
- * - dev_table[] accesses are protected by map_lock, the
- * ib_uverbs_device structures are properly reference counted, and
+ * - the ib_uverbs_device structures are properly reference counted and
* everything else is purely local to the file being created, so
* races against other open calls are not a problem;
* - there is no ioctl method to race against;
- * - the device is added to dev_table[] as the last part of module
- * initialization, the open method will either immediately run
- * -ENXIO, or all required initialization will be done.
+ * - the open method will either immediately run -ENXIO, or all
+ * required initialization will be done.
*/
static int ib_uverbs_open(struct inode *inode, struct file *filp)
{
@@ -631,13 +628,10 @@ static int ib_uverbs_open(struct inode *inode, struct file *filp)
struct ib_uverbs_file *file;
int ret;

- spin_lock(&map_lock);
- dev = dev_table[iminor(inode) - IB_UVERBS_BASE_MINOR];
+ dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
if (dev)
kref_get(&dev->ref);
- spin_unlock(&map_lock);
-
- if (!dev)
+ else
return -ENXIO;

if (!try_module_get(dev->ib_dev->owner)) {
@@ -778,10 +772,6 @@ static void ib_uverbs_add_one(struct ib_device *device)
if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
goto err_class;

- spin_lock(&map_lock);
- dev_table[uverbs_dev->devnum] = uverbs_dev;
- spin_unlock(&map_lock);
-
ib_set_client_data(device, &uverbs_client, uverbs_dev);

return;
@@ -811,10 +801,6 @@ static void ib_uverbs_remove_one(struct ib_device *device)
device_destroy(uverbs_class, uverbs_dev->cdev.dev);
cdev_del(&uverbs_dev->cdev);

- spin_lock(&map_lock);
- dev_table[uverbs_dev->devnum] = NULL;
- spin_unlock(&map_lock);
-
clear_bit(uverbs_dev->devnum, dev_map);

kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);


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