linux-kernel - [PATCH] spi-topcliff-pch: fix to use list_for_each_entry

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Message-ID: <CAPgLHd8fm6BysDeifRnaG8PPRKynEuAWp1ZXHkcoiF_NJPQkzQ@mail.gmail.com>
Date:	Tue, 21 Aug 2012 12:16:16 +0800
From:	Wei Yongjun <weiyj.lk@...il.com>
To:	grant.likely@...retlab.ca
Cc:	yongjun_wei@...ndmicro.com.cn,
	spi-devel-general@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: [PATCH] spi-topcliff-pch: fix to use list_for_each_entry_safe() when
 delete items

From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>

Since we will be removing items off the list using list_del() we need
to use a safer version of the list_for_each_entry() macro aptly named
list_for_each_entry_safe(). We should use the safe macro if the loop
involves deletions of items.

Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
---
 drivers/spi/spi-topcliff-pch.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-topcliff-pch.c b/drivers/spi/spi-topcliff-pch.c
index cd56dcf..309b717 100644
--- a/drivers/spi/spi-topcliff-pch.c
+++ b/drivers/spi/spi-topcliff-pch.c
@@ -615,7 +615,7 @@ static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw)
 	int size;
 	u32 n_writes;
 	int j;
-	struct spi_message *pmsg;
+	struct spi_message *pmsg, *tmp;
 	const u8 *tx_buf;
 	const u16 *tx_sbuf;
 
@@ -656,7 +656,7 @@ static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw)
 	if (!data->pkt_rx_buff) {
 		/* flush queue and set status of all transfers to -ENOMEM */
 		dev_err(&data->master->dev, "%s :kzalloc failed\n", __func__);
-		list_for_each_entry(pmsg, data->queue.next, queue) {
+		list_for_each_entry_safe(pmsg, tmp, data->queue.next, queue) {
 			pmsg->status = -ENOMEM;
 
 			if (pmsg->complete != 0)
@@ -703,7 +703,7 @@ static void pch_spi_set_tx(struct pch_spi_data *data, int *bpw)
 
 static void pch_spi_nomore_transfer(struct pch_spi_data *data)
 {
-	struct spi_message *pmsg;
+	struct spi_message *pmsg, *tmp;
 	dev_dbg(&data->master->dev, "%s called\n", __func__);
 	/* Invoke complete callback
 	 * [To the spi core..indicating end of transfer] */
@@ -740,7 +740,7 @@ static void pch_spi_nomore_transfer(struct pch_spi_data *data)
 		dev_dbg(&data->master->dev,
 			"%s suspend/remove initiated, flushing queue\n",
 			__func__);
-		list_for_each_entry(pmsg, data->queue.next, queue) {
+		list_for_each_entry_safe(pmsg, tmp, data->queue.next, queue) {
 			pmsg->status = -EIO;
 
 			if (pmsg->complete)
@@ -1187,7 +1187,7 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
 
 static void pch_spi_process_messages(struct work_struct *pwork)
 {
-	struct spi_message *pmsg;
+	struct spi_message *pmsg, *tmp;
 	struct pch_spi_data *data;
 	int bpw;
 
@@ -1199,7 +1199,7 @@ static void pch_spi_process_messages(struct work_struct *pwork)
 	if (data->board_dat->suspend_sts || (data->status == STATUS_EXITING)) {
 		dev_dbg(&data->master->dev, "%s suspend/remove initiated,"
 			"flushing queue\n", __func__);
-		list_for_each_entry(pmsg, data->queue.next, queue) {
+		list_for_each_entry_safe(pmsg, tmp, data->queue.next, queue) {
 			pmsg->status = -EIO;
 
 			if (pmsg->complete != 0) {


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