linux-kernel - [PATCH] block: swim3: Convert timers to use timer

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Date:   Mon, 16 Oct 2017 17:04:28 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Johannes Thumshirn <jthumshirn@...e.de>,
        Ingo Molnar <mingo@...nel.org>,
        Arvind Yadav <arvind.yadav.cs@...il.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] block: swim3: 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: Jens Axboe <axboe@...nel.dk>
Cc: Johannes Thumshirn <jthumshirn@...e.de>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Arvind Yadav <arvind.yadav.cs@...il.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/block/swim3.c | 29 ++++++++++++++---------------
 1 file changed, 14 insertions(+), 15 deletions(-)

diff --git a/drivers/block/swim3.c b/drivers/block/swim3.c
index 9f931f8f6b4c..a299bef9bbfe 100644
--- a/drivers/block/swim3.c
+++ b/drivers/block/swim3.c
@@ -239,10 +239,10 @@ static unsigned short write_postamble[] = {
 static void seek_track(struct floppy_state *fs, int n);
 static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);
 static void act(struct floppy_state *fs);
-static void scan_timeout(unsigned long data);
-static void seek_timeout(unsigned long data);
-static void settle_timeout(unsigned long data);
-static void xfer_timeout(unsigned long data);
+static void scan_timeout(struct timer_list *t);
+static void seek_timeout(struct timer_list *t);
+static void settle_timeout(struct timer_list *t);
+static void xfer_timeout(struct timer_list *t);
 static irqreturn_t swim3_interrupt(int irq, void *dev_id);
 /*static void fd_dma_interrupt(int irq, void *dev_id);*/
 static int grab_drive(struct floppy_state *fs, enum swim_state state,
@@ -392,13 +392,12 @@ static void do_fd_request(struct request_queue * q)
 }
 
 static void set_timeout(struct floppy_state *fs, int nticks,
-			void (*proc)(unsigned long))
+			void (*proc)(struct timer_list *t))
 {
 	if (fs->timeout_pending)
 		del_timer(&fs->timeout);
 	fs->timeout.expires = jiffies + nticks;
 	fs->timeout.function = proc;
-	fs->timeout.data = (unsigned long) fs;
 	add_timer(&fs->timeout);
 	fs->timeout_pending = 1;
 }
@@ -569,9 +568,9 @@ static void act(struct floppy_state *fs)
 	}
 }
 
-static void scan_timeout(unsigned long data)
+static void scan_timeout(struct timer_list *t)
 {
-	struct floppy_state *fs = (struct floppy_state *) data;
+	struct floppy_state *fs = from_timer(fs, t, timer);
 	struct swim3 __iomem *sw = fs->swim3;
 	unsigned long flags;
 
@@ -594,9 +593,9 @@ static void scan_timeout(unsigned long data)
 	spin_unlock_irqrestore(&swim3_lock, flags);
 }
 
-static void seek_timeout(unsigned long data)
+static void seek_timeout(struct timer_list *t)
 {
-	struct floppy_state *fs = (struct floppy_state *) data;
+	struct floppy_state *fs = from_timer(fs, t, timer);
 	struct swim3 __iomem *sw = fs->swim3;
 	unsigned long flags;
 
@@ -614,9 +613,9 @@ static void seek_timeout(unsigned long data)
 	spin_unlock_irqrestore(&swim3_lock, flags);
 }
 
-static void settle_timeout(unsigned long data)
+static void settle_timeout(struct timer_list *t)
 {
-	struct floppy_state *fs = (struct floppy_state *) data;
+	struct floppy_state *fs = from_timer(fs, t, timer);
 	struct swim3 __iomem *sw = fs->swim3;
 	unsigned long flags;
 
@@ -644,9 +643,9 @@ static void settle_timeout(unsigned long data)
 	spin_unlock_irqrestore(&swim3_lock, flags);
 }
 
-static void xfer_timeout(unsigned long data)
+static void xfer_timeout(struct timer_list *t)
 {
-	struct floppy_state *fs = (struct floppy_state *) data;
+	struct floppy_state *fs = from_timer(fs, t, timer);
 	struct swim3 __iomem *sw = fs->swim3;
 	struct dbdma_regs __iomem *dr = fs->dma;
 	unsigned long flags;
@@ -1182,7 +1181,7 @@ static int swim3_add_device(struct macio_dev *mdev, int index)
 		return -EBUSY;
 	}
 
-	init_timer(&fs->timeout);
+	timer_setup(&fs->timeout, NULL, 0);
 
 	swim3_info("SWIM3 floppy controller %s\n",
 		mdev->media_bay ? "in media bay" : "");
-- 
2.7.4


-- 
Kees Cook
Pixel Security