From 5a2ca43fa54f561c252c2ceb986daa49e258ab13 Mon Sep 17 00:00:00 2001 From: Somya Anand Date: Sat, 14 Mar 2015 01:03:10 +0530 Subject: [PATCH] Staging: lustre: Iterate list using list_for_each_entry 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 --- .../staging/lustre/lnet/klnds/o2iblnd/o2iblnd.c | 6 ++---- .../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 2f2f71c4c052..1422d5668bf8 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 c762dbe10693..2e156a995e55 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); -- 2.39.5