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

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Date:   Tue, 24 Oct 2017 03:02:23 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Vinod Koul <vinod.koul@...el.com>
Cc:     Dan Williams <dan.j.williams@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Ujjal Singh <ujjal.singh@...el.com>,
        Pan Bian <bianpan2016@....com>, linux-kernel@...r.kernel.org,
        dmaengine@...r.kernel.org
Subject: [PATCH] dmaengine: 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: Vinod Koul <vinod.koul@...el.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Dave Jiang <dave.jiang@...el.com>
Cc: Ujjal Singh <ujjal.singh@...el.com>
Cc: Pan Bian <bianpan2016@....com>
Cc: dmaengine@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 drivers/dma/imx-dma.c   | 8 +++-----
 drivers/dma/ioat/dma.c  | 6 +++---
 drivers/dma/ioat/dma.h  | 3 +--
 drivers/dma/ioat/init.c | 2 +-
 4 files changed, 8 insertions(+), 11 deletions(-)

diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c
index f681df8f0ed3..331f863c605e 100644
--- a/drivers/dma/imx-dma.c
+++ b/drivers/dma/imx-dma.c
@@ -364,9 +364,9 @@ static void imxdma_disable_hw(struct imxdma_channel *imxdmac)
 	local_irq_restore(flags);
 }
 
-static void imxdma_watchdog(unsigned long data)
+static void imxdma_watchdog(struct timer_list *t)
 {
-	struct imxdma_channel *imxdmac = (struct imxdma_channel *)data;
+	struct imxdma_channel *imxdmac = from_timer(imxdmac, t, watchdog);
 	struct imxdma_engine *imxdma = imxdmac->imxdma;
 	int channel = imxdmac->channel;
 
@@ -1153,9 +1153,7 @@ static int __init imxdma_probe(struct platform_device *pdev)
 			}
 
 			imxdmac->irq = irq + i;
-			init_timer(&imxdmac->watchdog);
-			imxdmac->watchdog.function = &imxdma_watchdog;
-			imxdmac->watchdog.data = (unsigned long)imxdmac;
+			timer_setup(&imxdmac->watchdog, imxdma_watchdog, 0);
 		}
 
 		imxdmac->imxdma = imxdma;
diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index f70cc74032ea..58d4ccd33672 100644
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -474,7 +474,7 @@ int ioat_check_space_lock(struct ioatdma_chan *ioat_chan, int num_descs)
 	if (time_is_before_jiffies(ioat_chan->timer.expires)
 	    && timer_pending(&ioat_chan->timer)) {
 		mod_timer(&ioat_chan->timer, jiffies + COMPLETION_TIMEOUT);
-		ioat_timer_event((unsigned long)ioat_chan);
+		ioat_timer_event(&ioat_chan->timer);
 	}
 
 	return -ENOMEM;
@@ -862,9 +862,9 @@ static void check_active(struct ioatdma_chan *ioat_chan)
 		mod_timer(&ioat_chan->timer, jiffies + IDLE_TIMEOUT);
 }
 
-void ioat_timer_event(unsigned long data)
+void ioat_timer_event(struct timer_list *t)
 {
-	struct ioatdma_chan *ioat_chan = to_ioat_chan((void *)data);
+	struct ioatdma_chan *ioat_chan = from_timer(ioat_chan, t, timer);
 	dma_addr_t phys_complete;
 	u64 status;
 
diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h
index 56200eefcf5e..1ab42ec2b7ff 100644
--- a/drivers/dma/ioat/dma.h
+++ b/drivers/dma/ioat/dma.h
@@ -406,10 +406,9 @@ enum dma_status
 ioat_tx_status(struct dma_chan *c, dma_cookie_t cookie,
 		struct dma_tx_state *txstate);
 void ioat_cleanup_event(unsigned long data);
-void ioat_timer_event(unsigned long data);
+void ioat_timer_event(struct timer_list *t);
 int ioat_check_space_lock(struct ioatdma_chan *ioat_chan, int num_descs);
 void ioat_issue_pending(struct dma_chan *chan);
-void ioat_timer_event(unsigned long data);
 
 /* IOAT Init functions */
 bool is_bwd_ioat(struct pci_dev *pdev);
diff --git a/drivers/dma/ioat/init.c b/drivers/dma/ioat/init.c
index 93e006c3441d..2f31d3d0caa6 100644
--- a/drivers/dma/ioat/init.c
+++ b/drivers/dma/ioat/init.c
@@ -760,7 +760,7 @@ ioat_init_channel(struct ioatdma_device *ioat_dma,
 	dma_cookie_init(&ioat_chan->dma_chan);
 	list_add_tail(&ioat_chan->dma_chan.device_node, &dma->channels);
 	ioat_dma->idx[idx] = ioat_chan;
-	setup_timer(&ioat_chan->timer, ioat_timer_event, data);
+	timer_setup(&ioat_chan->timer, ioat_timer_event, 0);
 	tasklet_init(&ioat_chan->cleanup_task, ioat_cleanup_event, data);
 }
 
-- 
2.7.4


-- 
Kees Cook
Pixel Security