linux-kernel - [PATCH 6/6] drivers/dma: remove iterator use outside the loop

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Date:   Tue,  1 Mar 2022 15:58:39 +0800
From:   Xiaomeng Tong <xiam0nd.tong@...il.com>
To:     torvalds@...ux-foundation.org
Cc:     arnd@...db.de, jakobkoschel@...il.com,
        linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
        keescook@...omium.org, jannh@...gle.com,
        linux-kbuild@...r.kernel.org, linux-mm@...ck.org,
        netdev@...r.kernel.org, Xiaomeng Tong <xiam0nd.tong@...il.com>
Subject: [PATCH 6/6] drivers/dma: remove iterator use outside the loop

Demonstrations for:
 - list_for_each_entry_from_inside
 - list_for_each_entry_safe_from_inside

Signed-off-by: Xiaomeng Tong <xiam0nd.tong@...il.com>
---
 drivers/dma/iop-adma.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c
index 310b899d5..2f326fb37 100644
--- a/drivers/dma/iop-adma.c
+++ b/drivers/dma/iop-adma.c
@@ -159,7 +159,6 @@ static void __iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
 
 		/* all the members of a group are complete */
 		if (slots_per_op != 0 && slot_cnt == 0) {
-			struct iop_adma_desc_slot *grp_iter, *_grp_iter;
 			int end_of_chain = 0;
 			pr_debug("\tgroup end\n");
 
@@ -167,9 +166,8 @@ static void __iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
 			if (grp_start->xor_check_result) {
 				u32 zero_sum_result = 0;
 				slot_cnt = grp_start->slot_cnt;
-				grp_iter = grp_start;
 
-				list_for_each_entry_from(grp_iter,
+				list_for_each_entry_from_inside(grp_iter, grp_start,
 					&iop_chan->chain, chain_node) {
 					zero_sum_result |=
 					    iop_desc_get_zero_result(grp_iter);
@@ -186,9 +184,8 @@ static void __iop_adma_slot_cleanup(struct iop_adma_chan *iop_chan)
 
 			/* clean up the group */
 			slot_cnt = grp_start->slot_cnt;
-			grp_iter = grp_start;
-			list_for_each_entry_safe_from(grp_iter, _grp_iter,
-				&iop_chan->chain, chain_node) {
+			list_for_each_entry_safe_from_inside(grp_iter, _grp_iter,
+				grp_start, &iop_chan->chain, chain_node) {
 				cookie = iop_adma_run_tx_complete_actions(
 					grp_iter, iop_chan, cookie);
 
-- 
2.17.1