linux-kernel - [PATCH] char: pcmcia: Convert timers to use timer

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Date:   Mon, 16 Oct 2017 16:28:26 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Harald Welte <laforge@...monks.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jarod Wilson <jarod@...hat.com>,
        Stephen Hemminger <stephen@...workplumber.org>,
        Johannes Berg <johannes.berg@...el.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] char: pcmcia: Convert timers to use timer_setup()

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly.

Cc: Harald Welte <laforge@...monks.org>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Jarod Wilson <jarod@...hat.com>
Cc: Stephen Hemminger <stephen@...workplumber.org>
Cc: Johannes Berg <johannes.berg@...el.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/char/pcmcia/cm4000_cs.c   | 6 +++---
 drivers/char/pcmcia/cm4040_cs.c   | 7 +++----
 drivers/char/pcmcia/synclink_cs.c | 8 ++++----
 3 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/char/pcmcia/cm4000_cs.c b/drivers/char/pcmcia/cm4000_cs.c
index cd53771b9ae7..370e0a64ead1 100644
--- a/drivers/char/pcmcia/cm4000_cs.c
+++ b/drivers/char/pcmcia/cm4000_cs.c
@@ -659,9 +659,9 @@ static void terminate_monitor(struct cm4000_dev *dev)
  * is already doing that for you.
  */
 
-static void monitor_card(unsigned long p)
+static void monitor_card(struct timer_list *t)
 {
-	struct cm4000_dev *dev = (struct cm4000_dev *) p;
+	struct cm4000_dev *dev = from_timer(dev, t, timer);
 	unsigned int iobase = dev->p_dev->resource[0]->start;
 	unsigned short s;
 	struct ptsreq ptsreq;
@@ -1374,7 +1374,7 @@ static void start_monitor(struct cm4000_dev *dev)
 	DEBUGP(3, dev, "-> start_monitor\n");
 	if (!dev->monitor_running) {
 		DEBUGP(5, dev, "create, init and add timer\n");
-		setup_timer(&dev->timer, monitor_card, (unsigned long)dev);
+		timer_setup(&dev->timer, monitor_card, 0);
 		dev->monitor_running = 1;
 		mod_timer(&dev->timer, jiffies);
 	} else
diff --git a/drivers/char/pcmcia/cm4040_cs.c b/drivers/char/pcmcia/cm4040_cs.c
index 382c864814d9..9a1aaf538758 100644
--- a/drivers/char/pcmcia/cm4040_cs.c
+++ b/drivers/char/pcmcia/cm4040_cs.c
@@ -104,9 +104,9 @@ static inline unsigned char xinb(unsigned short port)
 
 /* poll the device fifo status register.  not to be confused with
  * the poll syscall. */
-static void cm4040_do_poll(unsigned long dummy)
+static void cm4040_do_poll(struct timer_list *t)
 {
-	struct reader_dev *dev = (struct reader_dev *) dummy;
+	struct reader_dev *dev = from_timer(dev, t, poll_timer);
 	unsigned int obs = xinb(dev->p_dev->resource[0]->start
 				+ REG_OFFSET_BUFFER_STATUS);
 
@@ -465,7 +465,6 @@ static int cm4040_open(struct inode *inode, struct file *filp)
 
 	link->open = 1;
 
-	dev->poll_timer.data = (unsigned long) dev;
 	mod_timer(&dev->poll_timer, jiffies + POLL_PERIOD);
 
 	DEBUGP(2, dev, "<- cm4040_open (successfully)\n");
@@ -585,7 +584,7 @@ static int reader_probe(struct pcmcia_device *link)
 	init_waitqueue_head(&dev->poll_wait);
 	init_waitqueue_head(&dev->read_wait);
 	init_waitqueue_head(&dev->write_wait);
-	setup_timer(&dev->poll_timer, cm4040_do_poll, 0);
+	timer_setup(&dev->poll_timer, cm4040_do_poll, 0);
 
 	ret = reader_config(link, i);
 	if (ret) {
diff --git a/drivers/char/pcmcia/synclink_cs.c b/drivers/char/pcmcia/synclink_cs.c
index 62be953e5fb0..aa502e9fb7fa 100644
--- a/drivers/char/pcmcia/synclink_cs.c
+++ b/drivers/char/pcmcia/synclink_cs.c
@@ -375,7 +375,7 @@ static void reset_device(MGSLPC_INFO *info);
 static void hdlc_mode(MGSLPC_INFO *info);
 static void async_mode(MGSLPC_INFO *info);
 
-static void tx_timeout(unsigned long context);
+static void tx_timeout(struct timer_list *t);
 
 static int carrier_raised(struct tty_port *port);
 static void dtr_rts(struct tty_port *port, int onoff);
@@ -1289,7 +1289,7 @@ static int startup(MGSLPC_INFO * info, struct tty_struct *tty)
 
 	memset(&info->icount, 0, sizeof(info->icount));
 
-	setup_timer(&info->tx_timer, tx_timeout, (unsigned long)info);
+	timer_setup(&info->tx_timer, tx_timeout, 0);
 
 	/* Allocate and claim adapter resources */
 	retval = claim_resources(info);
@@ -3846,9 +3846,9 @@ static void trace_block(MGSLPC_INFO *info,const char* data, int count, int xmit)
 /* HDLC frame time out
  * update stats and do tx completion processing
  */
-static void tx_timeout(unsigned long context)
+static void tx_timeout(struct timer_list *t)
 {
-	MGSLPC_INFO *info = (MGSLPC_INFO*)context;
+	MGSLPC_INFO *info = from_timer(info, t, tx_timer);
 	unsigned long flags;
 
 	if (debug_level >= DEBUG_LEVEL_INFO)
-- 
2.7.4


-- 
Kees Cook
Pixel Security