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idr: Return the deleted entry from idr_remove

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It is a relatively common idiom (8 instances) to first look up an IDR
entry, and then remove it from the tree if it is found, possibly doing
further operations upon the entry afterwards.  If we change idr_remove()
to return the removed object, all of these users can save themselves a
walk of the IDR tree.

Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
This commit is contained in:
Matthew Wilcox 2016-12-22 13:30:22 -05:00
parent 8ac0486831
commit d3e709e63e
9 changed files with 15 additions and 29 deletions
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5
drivers/atm/nicstar.c
View File

@ -1980,13 +1980,12 @@ static void dequeue_rx(ns_dev * card, ns_rsqe * rsqe)
card->lbfqc = ns_stat_lfbqc_get(stat);
id = le32_to_cpu(rsqe->buffer_handle);
skb = idr_find(&card->idr, id);
skb = idr_remove(&card->idr, id);
if (!skb) {
RXPRINTK(KERN_ERR
"nicstar%d: idr_find() failed!\n", card->index);
"nicstar%d: skb not found!\n", card->index);
return;
}
idr_remove(&card->idr, id);
dma_sync_single_for_cpu(&card->pcidev->dev,
NS_PRV_DMA(skb),
(NS_PRV_BUFTYPE(skb) == BUF_SM

6
drivers/block/drbd/drbd_main.c
View File

@ -2915,11 +2915,9 @@ out_idr_remove_vol:
idr_remove(&connection->peer_devices, vnr);
out_idr_remove_from_resource:
for_each_connection(connection, resource) {
peer_device = idr_find(&connection->peer_devices, vnr);
if (peer_device) {
idr_remove(&connection->peer_devices, vnr);
peer_device = idr_remove(&connection->peer_devices, vnr);
if (peer_device)
kref_put(&connection->kref, drbd_destroy_connection);
}
}
for_each_peer_device_safe(peer_device, tmp_peer_device, device) {
list_del(&peer_device->peer_devices);

3
drivers/firewire/core-cdev.c
View File

@ -1307,8 +1307,7 @@ static void iso_resource_work(struct work_struct *work)
*/
if (r->todo == ISO_RES_REALLOC && !success &&
!client->in_shutdown &&
idr_find(&client->resource_idr, r->resource.handle)) {
idr_remove(&client->resource_idr, r->resource.handle);
idr_remove(&client->resource_idr, r->resource.handle)) {
client_put(client);
free = true;
}

4
drivers/gpu/drm/amd/amdgpu/amdgpu_bo_list.c
View File

@ -70,10 +70,10 @@ static void amdgpu_bo_list_destroy(struct amdgpu_fpriv *fpriv, int id)
struct amdgpu_bo_list *list;
mutex_lock(&fpriv->bo_list_lock);
list = idr_find(&fpriv->bo_list_handles, id);
list = idr_remove(&fpriv->bo_list_handles, id);
if (list) {
/* Another user may have a reference to this list still */
mutex_lock(&list->lock);
idr_remove(&fpriv->bo_list_handles, id);
mutex_unlock(&list->lock);
amdgpu_bo_list_free(list);
}

10
drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
View File

@ -135,15 +135,11 @@ static int amdgpu_ctx_free(struct amdgpu_fpriv *fpriv, uint32_t id)
struct amdgpu_ctx *ctx;
mutex_lock(&mgr->lock);
ctx = idr_find(&mgr->ctx_handles, id);
if (ctx) {
idr_remove(&mgr->ctx_handles, id);
ctx = idr_remove(&mgr->ctx_handles, id);
if (ctx)
kref_put(&ctx->refcount, amdgpu_ctx_do_release);
mutex_unlock(&mgr->lock);
return 0;
}
mutex_unlock(&mgr->lock);
return -EINVAL;
return ctx ? 0 : -EINVAL;
}
static int amdgpu_ctx_query(struct amdgpu_device *adev,

4
drivers/net/wireless/marvell/mwifiex/txrx.c
View File

@ -346,9 +346,7 @@ void mwifiex_parse_tx_status_event(struct mwifiex_private *priv,
return;
spin_lock_irqsave(&priv->ack_status_lock, flags);
ack_skb = idr_find(&priv->ack_status_frames, tx_status->tx_token_id);
if (ack_skb)
idr_remove(&priv->ack_status_frames, tx_status->tx_token_id);
ack_skb = idr_remove(&priv->ack_status_frames, tx_status->tx_token_id);
spin_unlock_irqrestore(&priv->ack_status_lock, flags);
if (ack_skb) {

4
drivers/target/target_core_user.c
View File

@ -642,9 +642,7 @@ static unsigned int tcmu_handle_completions(struct tcmu_dev *udev)
WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD);
spin_lock(&udev->commands_lock);
cmd = idr_find(&udev->commands, entry->hdr.cmd_id);
if (cmd)
idr_remove(&udev->commands, cmd->cmd_id);
cmd = idr_remove(&udev->commands, entry->hdr.cmd_id);
spin_unlock(&udev->commands_lock);
if (!cmd) {

4
include/linux/idr.h
View File

@ -88,9 +88,9 @@ void *idr_get_next(struct idr *, int *nextid);
void *idr_replace(struct idr *, void *, int id);
void idr_destroy(struct idr *);
static inline void idr_remove(struct idr *idr, int id)
static inline void *idr_remove(struct idr *idr, int id)
{
radix_tree_delete(&idr->idr_rt, id);
return radix_tree_delete_item(&idr->idr_rt, id, NULL);
}
static inline void idr_init(struct idr *idr)

4
net/mac80211/status.c
View File

@ -462,9 +462,7 @@ static void ieee80211_report_ack_skb(struct ieee80211_local *local,
unsigned long flags;
spin_lock_irqsave(&local->ack_status_lock, flags);
skb = idr_find(&local->ack_status_frames, info->ack_frame_id);
if (skb)
idr_remove(&local->ack_status_frames, info->ack_frame_id);
skb = idr_remove(&local->ack_status_frames, info->ack_frame_id);
spin_unlock_irqrestore(&local->ack_status_lock, flags);
if (!skb)