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Date: Mon, 16 Oct 2017 16:25:03 -0700
From: Kees Cook <keescook@...omium.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Ian Abbott <abbotti@....co.uk>,
H Hartley Sweeten <hsweeten@...ionengravers.com>,
devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH] staging/comedi: 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. Adds pointer back to
comedi device from private struct.
Cc: Ian Abbott <abbotti@....co.uk>
Cc: H Hartley Sweeten <hsweeten@...ionengravers.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: devel@...verdev.osuosl.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
drivers/staging/comedi/drivers/comedi_test.c | 18 ++++++++++--------
drivers/staging/comedi/drivers/das16.c | 11 ++++++-----
drivers/staging/comedi/drivers/jr3_pci.c | 10 ++++++----
3 files changed, 22 insertions(+), 17 deletions(-)
diff --git a/drivers/staging/comedi/drivers/comedi_test.c b/drivers/staging/comedi/drivers/comedi_test.c
index ccfd642998be..c7e8194984e5 100644
--- a/drivers/staging/comedi/drivers/comedi_test.c
+++ b/drivers/staging/comedi/drivers/comedi_test.c
@@ -93,6 +93,7 @@ struct waveform_private {
unsigned int ai_scan_period; /* AI scan period in usec */
unsigned int ai_convert_period; /* AI conversion period in usec */
struct timer_list ao_timer; /* timer for AO commands */
+ struct comedi_device *dev; /* parent comedi device */
u64 ao_last_scan_time; /* time of previous AO scan in usec */
unsigned int ao_scan_period; /* AO scan period in usec */
unsigned short ao_loopbacks[N_CHANS];
@@ -201,10 +202,10 @@ static unsigned short fake_waveform(struct comedi_device *dev,
* It should run in the background; therefore it is scheduled by
* a timer mechanism.
*/
-static void waveform_ai_timer(unsigned long arg)
+static void waveform_ai_timer(struct timer_list *t)
{
- struct comedi_device *dev = (struct comedi_device *)arg;
- struct waveform_private *devpriv = dev->private;
+ struct waveform_private *devpriv = from_timer(devpriv, t, ai_timer);
+ struct comedi_device *dev = devpriv->dev;
struct comedi_subdevice *s = dev->read_subdev;
struct comedi_async *async = s->async;
struct comedi_cmd *cmd = &async->cmd;
@@ -438,10 +439,10 @@ static int waveform_ai_insn_read(struct comedi_device *dev,
* This is the background routine to handle AO commands, scheduled by
* a timer mechanism.
*/
-static void waveform_ao_timer(unsigned long arg)
+static void waveform_ao_timer(struct timer_list *t)
{
- struct comedi_device *dev = (struct comedi_device *)arg;
- struct waveform_private *devpriv = dev->private;
+ struct waveform_private *devpriv = from_timer(devpriv, t, ao_timer);
+ struct comedi_device *dev = devpriv->dev;
struct comedi_subdevice *s = dev->write_subdev;
struct comedi_async *async = s->async;
struct comedi_cmd *cmd = &async->cmd;
@@ -686,8 +687,9 @@ static int waveform_common_attach(struct comedi_device *dev,
for (i = 0; i < s->n_chan; i++)
devpriv->ao_loopbacks[i] = s->maxdata / 2;
- setup_timer(&devpriv->ai_timer, waveform_ai_timer, (unsigned long)dev);
- setup_timer(&devpriv->ao_timer, waveform_ao_timer, (unsigned long)dev);
+ devpriv->dev = dev;
+ timer_setup(&devpriv->ai_timer, waveform_ai_timer, 0);
+ timer_setup(&devpriv->ao_timer, waveform_ao_timer, 0);
dev_info(dev->class_dev,
"%s: %u microvolt, %u microsecond waveform attached\n",
diff --git a/drivers/staging/comedi/drivers/das16.c b/drivers/staging/comedi/drivers/das16.c
index 2b2a446af3f5..ddd4aeab6365 100644
--- a/drivers/staging/comedi/drivers/das16.c
+++ b/drivers/staging/comedi/drivers/das16.c
@@ -440,6 +440,7 @@ static inline int timer_period(void)
struct das16_private_struct {
struct comedi_isadma *dma;
+ struct comedi_device *dev;
unsigned int clockbase;
unsigned int ctrl_reg;
unsigned int divisor1;
@@ -525,10 +526,10 @@ static void das16_interrupt(struct comedi_device *dev)
comedi_handle_events(dev, s);
}
-static void das16_timer_interrupt(unsigned long arg)
+static void das16_timer_interrupt(struct timer_list *t)
{
- struct comedi_device *dev = (struct comedi_device *)arg;
- struct das16_private_struct *devpriv = dev->private;
+ struct das16_private_struct *devpriv = from_timer(devpriv, t, timer);
+ struct comedi_device *dev = devpriv->dev;
unsigned long flags;
das16_interrupt(dev);
@@ -934,8 +935,7 @@ static void das16_alloc_dma(struct comedi_device *dev, unsigned int dma_chan)
{
struct das16_private_struct *devpriv = dev->private;
- setup_timer(&devpriv->timer, das16_timer_interrupt,
- (unsigned long)dev);
+ timer_setup(&devpriv->timer, das16_timer_interrupt, 0);
/* only DMA channels 3 and 1 are valid */
if (!(dma_chan == 1 || dma_chan == 3))
@@ -1044,6 +1044,7 @@ static int das16_attach(struct comedi_device *dev, struct comedi_devconfig *it)
devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
if (!devpriv)
return -ENOMEM;
+ devpriv->dev = dev;
if (board->size < 0x400) {
ret = comedi_request_region(dev, it->options[0], board->size);
diff --git a/drivers/staging/comedi/drivers/jr3_pci.c b/drivers/staging/comedi/drivers/jr3_pci.c
index f1c2a20a7d4d..cbff3b41bb45 100644
--- a/drivers/staging/comedi/drivers/jr3_pci.c
+++ b/drivers/staging/comedi/drivers/jr3_pci.c
@@ -96,6 +96,7 @@ struct jr3_pci_poll_delay {
struct jr3_pci_dev_private {
struct timer_list timer;
+ struct comedi_device *dev;
};
union jr3_pci_single_range {
@@ -585,10 +586,10 @@ jr3_pci_poll_subdevice(struct comedi_subdevice *s)
return result;
}
-static void jr3_pci_poll_dev(unsigned long data)
+static void jr3_pci_poll_dev(struct timer_list *t)
{
- struct comedi_device *dev = (struct comedi_device *)data;
- struct jr3_pci_dev_private *devpriv = dev->private;
+ struct jr3_pci_dev_private *devpriv = from_timer(devpriv, t, timer);
+ struct comedi_device *dev = devpriv->dev;
struct jr3_pci_subdev_private *spriv;
struct comedi_subdevice *s;
unsigned long flags;
@@ -770,7 +771,8 @@ static int jr3_pci_auto_attach(struct comedi_device *dev,
spriv->next_time_min = jiffies + msecs_to_jiffies(500);
}
- setup_timer(&devpriv->timer, jr3_pci_poll_dev, (unsigned long)dev);
+ devpriv->dev = dev;
+ timer_setup(&devpriv->timer, jr3_pci_poll_dev, 0);
devpriv->timer.expires = jiffies + msecs_to_jiffies(1000);
add_timer(&devpriv->timer);
--
2.7.4
--
Kees Cook
Pixel Security
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