Author: Somya Anand <somyaanand214@gmail.com>
Code using doubly linked list is iterated generally using list_empty and
list_entry functions, but it can be better written using list_for_each_entry
macro.
This patch replaces the while loop containing list_empty and list_entry with
list_for_each_entry and list_for_each_entry_safe. list_for_each_entry is a
macro which is used to iterate over a list of given type. So while loop used to
iterate over a list can be replaced with list_for_each_entry macro. However, if
list_del is used in the loop, then list_for_each_entry_safe is a better choice.
This transformation is done by using the following coccinelle script.
@ rule1 @
expression E1;
identifier I1, I2;
type T;
iterator name list_for_each_entry;
@@
- while (list_empty(&E1) == 0)
+ list_for_each_entry (I1, &E1, I2)
{
...when != T *I1;
- I1 = list_entry(E1.next, T, I2);
...when != list_del(...);
when != list_del_init(...);
}
@ rule2 @
expression E1;
identifier I1, I2;
type T;
iterator name list_for_each_entry_safe;
@@
T *I1;
+ T *tmp;
...
- while (list_empty(&E1) == 0)
+ list_for_each_entry_safe (I1, tmp, &E1, I2)
{
...when != T *I1;
- I1 = list_entry(E1.next, T, I2);
...
}
Signed-off-by: Somya Anand
Signed-off-by: Greg Kroah-Hartman
---
drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c | 6 ++----
drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c | 14 ++++++--------
2 files changed, 8 insertions(+), 12 deletions(-)
diff --git a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c
index 2f2f71c..1422d56 100644
--- a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c
+++ b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c
@@ -1893,13 +1893,11 @@ kiblnd_destroy_pmr_pool(kib_pool_t *pool)
{
kib_pmr_pool_t *ppo = container_of(pool, kib_pmr_pool_t, ppo_pool);
kib_phys_mr_t *pmr;
+ kib_phys_mr_t *tmp;
LASSERT(pool->po_allocated == 0);
- while (!list_empty(&pool->po_free_list)) {
- pmr = list_entry(pool->po_free_list.next,
- kib_phys_mr_t, pmr_list);
-
+ list_for_each_entry_safe(pmr, tmp, &pool->po_free_list, pmr_list) {
LASSERT(pmr->pmr_mr == NULL);
list_del(&pmr->pmr_list);
diff --git a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c
index c762dbe..2e156a9 100644
--- a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c
+++ b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c
@@ -1936,14 +1936,13 @@ kiblnd_handle_early_rxs(kib_conn_t *conn)
{
unsigned long flags;
kib_rx_t *rx;
+ kib_rx_t *tmp;
LASSERT(!in_interrupt());
LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
- while (!list_empty(&conn->ibc_early_rxs)) {
- rx = list_entry(conn->ibc_early_rxs.next,
- kib_rx_t, rx_list);
+ list_for_each_entry_safe(rx, tmp, &conn->ibc_early_rxs, rx_list) {
list_del(&rx->rx_list);
write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
@@ -2074,6 +2073,7 @@ kiblnd_connreq_done(kib_conn_t *conn, int status)
{
kib_peer_t *peer = conn->ibc_peer;
kib_tx_t *tx;
+ kib_tx_t *tmp;
struct list_head txs;
unsigned long flags;
int active;
@@ -2150,8 +2150,7 @@ kiblnd_connreq_done(kib_conn_t *conn, int status)
/* Schedule blocked txs */
spin_lock(&conn->ibc_lock);
- while (!list_empty(&txs)) {
- tx = list_entry(txs.next, kib_tx_t, tx_list);
+ list_for_each_entry_safe(tx, tmp, &txs, tx_list) {
list_del(&tx->tx_list);
kiblnd_queue_tx_locked(tx, conn);
@@ -3027,6 +3026,7 @@ kiblnd_check_conns(int idx)
struct list_head *ptmp;
kib_peer_t *peer;
kib_conn_t *conn;
+ kib_conn_t *tmp;
struct list_head *ctmp;
unsigned long flags;
@@ -3080,9 +3080,7 @@ kiblnd_check_conns(int idx)
/* Handle timeout by closing the whole
* connection. We can only be sure RDMA activity
* has ceased once the QP has been modified. */
- while (!list_empty(&closes)) {
- conn = list_entry(closes.next,
- kib_conn_t, ibc_connd_list);
+ list_for_each_entry_safe(conn, tmp, &closes, ibc_connd_list) {
list_del(&conn->ibc_connd_list);
kiblnd_close_conn(conn, -ETIMEDOUT);
kiblnd_conn_decref(conn); |
---
drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c | 6 ++----
drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c | 14 ++++++--------
2 files changed, 8 insertions(+), 12 deletions(-)
diff --git a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c
index 2f2f71c..1422d56 100644
--- a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c
+++ b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c
@@ -1893,13 +1893,11 @@ kiblnd_destroy_pmr_pool(kib_pool_t *pool)
{
kib_pmr_pool_t *ppo = container_of(pool, kib_pmr_pool_t, ppo_pool);
kib_phys_mr_t *pmr;
+ kib_phys_mr_t *tmp;
LASSERT(pool->po_allocated == 0);
- while (!list_empty(&pool->po_free_list)) {
- pmr = list_entry(pool->po_free_list.next,
- kib_phys_mr_t, pmr_list);
-
+ list_for_each_entry_safe(pmr, tmp, &pool->po_free_list, pmr_list) {
LASSERT(pmr->pmr_mr == NULL);
list_del(&pmr->pmr_list);
diff --git a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c
index c762dbe..2e156a9 100644
--- a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c
+++ b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c
@@ -1936,14 +1936,13 @@ kiblnd_handle_early_rxs(kib_conn_t *conn)
{
unsigned long flags;
kib_rx_t *rx;
+ kib_rx_t *tmp;
LASSERT(!in_interrupt());
LASSERT(conn->ibc_state >= IBLND_CONN_ESTABLISHED);
write_lock_irqsave(&kiblnd_data.kib_global_lock, flags);
- while (!list_empty(&conn->ibc_early_rxs)) {
- rx = list_entry(conn->ibc_early_rxs.next,
- kib_rx_t, rx_list);
+ list_for_each_entry_safe(rx, tmp, &conn->ibc_early_rxs, rx_list) {
list_del(&rx->rx_list);
write_unlock_irqrestore(&kiblnd_data.kib_global_lock, flags);
@@ -2074,6 +2073,7 @@ kiblnd_connreq_done(kib_conn_t *conn, int status)
{
kib_peer_t *peer = conn->ibc_peer;
kib_tx_t *tx;
+ kib_tx_t *tmp;
struct list_head txs;
unsigned long flags;
int active;
@@ -2150,8 +2150,7 @@ kiblnd_connreq_done(kib_conn_t *conn, int status)
/* Schedule blocked txs */
spin_lock(&conn->ibc_lock);
- while (!list_empty(&txs)) {
- tx = list_entry(txs.next, kib_tx_t, tx_list);
+ list_for_each_entry_safe(tx, tmp, &txs, tx_list) {
list_del(&tx->tx_list);
kiblnd_queue_tx_locked(tx, conn);
@@ -3027,6 +3026,7 @@ kiblnd_check_conns(int idx)
struct list_head *ptmp;
kib_peer_t *peer;
kib_conn_t *conn;
+ kib_conn_t *tmp;
struct list_head *ctmp;
unsigned long flags;
@@ -3080,9 +3080,7 @@ kiblnd_check_conns(int idx)
/* Handle timeout by closing the whole
* connection. We can only be sure RDMA activity
* has ceased once the QP has been modified. */
- while (!list_empty(&closes)) {
- conn = list_entry(closes.next,
- kib_conn_t, ibc_connd_list);
+ list_for_each_entry_safe(conn, tmp, &closes, ibc_connd_list) {
list_del(&conn->ibc_connd_list);
kiblnd_close_conn(conn, -ETIMEDOUT);
kiblnd_conn_decref(conn);
