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author | Hans Verkuil <hans.verkuil@cisco.com> | 2018-05-21 11:54:56 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-09-16 09:21:57 +0300 |
commit | a7b6f95f3ca616c0a9b03ba69f6c3e37849fc542 (patch) | |
tree | 19db2e58278708c8e98a0b4bef9bc2adb138ce3b /drivers/media/platform | |
parent | e432a58d7a0de0a20b518fe947c39d0b43a070ab (diff) | |
download | linux-a7b6f95f3ca616c0a9b03ba69f6c3e37849fc542.tar.xz |
media: vim2m: use workqueue
[ Upstream commit 144bd0ee304c7d0690eec285aee93019d3f30fc8 ]
v4l2_ctrl uses mutexes, so we can't setup a ctrl_handler in
interrupt context. Switch to a workqueue instead and drop the timer.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/media/platform')
-rw-r--r-- | drivers/media/platform/vim2m.c | 25 |
1 files changed, 10 insertions, 15 deletions
diff --git a/drivers/media/platform/vim2m.c b/drivers/media/platform/vim2m.c index 462099a141e4..6f87ef025ff1 100644 --- a/drivers/media/platform/vim2m.c +++ b/drivers/media/platform/vim2m.c @@ -3,7 +3,8 @@ * * This is a virtual device driver for testing mem-to-mem videobuf framework. * It simulates a device that uses memory buffers for both source and - * destination, processes the data and issues an "irq" (simulated by a timer). + * destination, processes the data and issues an "irq" (simulated by a delayed + * workqueue). * The device is capable of multi-instance, multi-buffer-per-transaction * operation (via the mem2mem framework). * @@ -19,7 +20,6 @@ #include <linux/module.h> #include <linux/delay.h> #include <linux/fs.h> -#include <linux/timer.h> #include <linux/sched.h> #include <linux/slab.h> @@ -148,7 +148,7 @@ struct vim2m_dev { struct mutex dev_mutex; spinlock_t irqlock; - struct timer_list timer; + struct delayed_work work_run; struct v4l2_m2m_dev *m2m_dev; }; @@ -336,12 +336,6 @@ static int device_process(struct vim2m_ctx *ctx, return 0; } -static void schedule_irq(struct vim2m_dev *dev, int msec_timeout) -{ - dprintk(dev, "Scheduling a simulated irq\n"); - mod_timer(&dev->timer, jiffies + msecs_to_jiffies(msec_timeout)); -} - /* * mem2mem callbacks */ @@ -387,13 +381,14 @@ static void device_run(void *priv) device_process(ctx, src_buf, dst_buf); - /* Run a timer, which simulates a hardware irq */ - schedule_irq(dev, ctx->transtime); + /* Run delayed work, which simulates a hardware irq */ + schedule_delayed_work(&dev->work_run, msecs_to_jiffies(ctx->transtime)); } -static void device_isr(struct timer_list *t) +static void device_work(struct work_struct *w) { - struct vim2m_dev *vim2m_dev = from_timer(vim2m_dev, t, timer); + struct vim2m_dev *vim2m_dev = + container_of(w, struct vim2m_dev, work_run.work); struct vim2m_ctx *curr_ctx; struct vb2_v4l2_buffer *src_vb, *dst_vb; unsigned long flags; @@ -805,6 +800,7 @@ static void vim2m_stop_streaming(struct vb2_queue *q) struct vb2_v4l2_buffer *vbuf; unsigned long flags; + flush_scheduled_work(); for (;;) { if (V4L2_TYPE_IS_OUTPUT(q->type)) vbuf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx); @@ -1015,6 +1011,7 @@ static int vim2m_probe(struct platform_device *pdev) vfd = &dev->vfd; vfd->lock = &dev->dev_mutex; vfd->v4l2_dev = &dev->v4l2_dev; + INIT_DELAYED_WORK(&dev->work_run, device_work); ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0); if (ret) { @@ -1026,7 +1023,6 @@ static int vim2m_probe(struct platform_device *pdev) v4l2_info(&dev->v4l2_dev, "Device registered as /dev/video%d\n", vfd->num); - timer_setup(&dev->timer, device_isr, 0); platform_set_drvdata(pdev, dev); dev->m2m_dev = v4l2_m2m_init(&m2m_ops); @@ -1083,7 +1079,6 @@ static int vim2m_remove(struct platform_device *pdev) media_device_cleanup(&dev->mdev); #endif v4l2_m2m_release(dev->m2m_dev); - del_timer_sync(&dev->timer); video_unregister_device(&dev->vfd); v4l2_device_unregister(&dev->v4l2_dev); |