linux-kernel - [PATCH] drivers/staging: Use RCU_INIT_POINTER(x, NULL) in fwserial/fwserial.c

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Date:	Mon, 24 Mar 2014 00:08:22 +0530
From:	Monam Agarwal <monamagarwal123@...il.com>
To:	gregkh@...uxfoundation.org, peter@...leysoftware.com,
	stefanr@...6.in-berlin.de, joe@...ches.com,
	valentin.ilie@...il.com, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drivers/staging: Use RCU_INIT_POINTER(x, NULL) in fwserial/fwserial.c

This patch replaces rcu_assign_pointer(x, NULL) with RCU_INIT_POINTER(x, NULL)

The rcu_assign_pointer() ensures that the initialization of a structure       
is carried out before storing a pointer to that structure. 
And in the case of the NULL pointer, there is no structure to initialize. 
So, rcu_assign_pointer(p, NULL) can be safely converted to RCU_INIT_POINTER(p, NULL)

Signed-off-by: Monam Agarwal <monamagarwal123@...il.com>
---
 drivers/staging/fwserial/fwserial.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/fwserial/fwserial.c b/drivers/staging/fwserial/fwserial.c
index 8af136e..4e42bde 100644
--- a/drivers/staging/fwserial/fwserial.c
+++ b/drivers/staging/fwserial/fwserial.c
@@ -1809,7 +1809,7 @@ static void fwserial_release_port(struct fwtty_port *port, bool reset)
 	port->max_payload = link_speed_to_max_payload(SCODE_100);
 	dma_fifo_change_tx_limit(&port->tx_fifo, port->max_payload);
 
-	rcu_assign_pointer(port->peer, NULL);
+	RCU_INIT_POINTER(port->peer, NULL);
 	spin_unlock_bh(&port->lock);
 
 	if (port->port.console && port->fwcon_ops->notify != NULL)
@@ -2235,7 +2235,7 @@ static int fwserial_create(struct fw_unit *unit)
 		port->max_payload = link_speed_to_max_payload(SCODE_100);
 		dma_fifo_init(&port->tx_fifo);
 
-		rcu_assign_pointer(port->peer, NULL);
+		RCU_INIT_POINTER(port->peer, NULL);
 		serial->ports[i] = port;
 
 		/* get unique bus addr region for port's status & recv fifo */
-- 
1.7.9.5

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