Em 04-10-2010 16:32, Arnd Bergmann escreveu:
> The dabusb device driver is sufficiently serialized using
> its own mutex, no need for the big kernel lock here
> in addition.
>
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxx>
> ---
>
> Hi Mauro,
>
> I just realized that the dabusb driver is not actually a v4l driver,
> when I did more test builds with allyesconfig and CONFIG_BKL disabled.
>
> I've added this patch to my bkl/config queue for now, but if you want to carry
> it in your tree, I'll drop it from mine.
Sorry for not handling it sooner... I have a large number of patches in my queue...
I don't have any patch for dabusb on my tree, so, I'm OK if you sent it via your
tree. So,
Acked-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
---
PS.: I tried to contact the authors a few weeks ago to double check about this driver.
I suspect that it were added for some prototype, based on its help message, and the
links I found about that. So, it could be a good idea to simply move it to staging
and let it die, as maybe nobody has an actual hardware for it...
Well, I got no answer about that so far.
>
> diff --git a/drivers/media/video/dabusb.c b/drivers/media/video/dabusb.c
> index 5b176bd..f3e25e9 100644
> --- a/drivers/media/video/dabusb.c
> +++ b/drivers/media/video/dabusb.c
> @@ -32,7 +32,6 @@
> #include <linux/list.h>
> #include <linux/vmalloc.h>
> #include <linux/slab.h>
> -#include <linux/smp_lock.h>
> #include <linux/init.h>
> #include <asm/uaccess.h>
> #include <asm/atomic.h>
> @@ -621,7 +620,6 @@ static int dabusb_open (struct inode *inode, struct file *file)
> if (devnum < DABUSB_MINOR || devnum >= (DABUSB_MINOR + NRDABUSB))
> return -EIO;
>
> - lock_kernel();
> s = &dabusb[devnum - DABUSB_MINOR];
>
> dbg("dabusb_open");
> @@ -630,21 +628,17 @@ static int dabusb_open (struct inode *inode, struct file *file)
> while (!s->usbdev || s->opened) {
> mutex_unlock(&s->mutex);
>
> - if (file->f_flags & O_NONBLOCK) {
> + if (file->f_flags & O_NONBLOCK)
> return -EBUSY;
> - }
> msleep_interruptible(500);
>
> - if (signal_pending (current)) {
> - unlock_kernel();
> + if (signal_pending (current))
> return -EAGAIN;
> - }
> mutex_lock(&s->mutex);
> }
> if (usb_set_interface (s->usbdev, _DABUSB_IF, 1) < 0) {
> mutex_unlock(&s->mutex);
> dev_err(&s->usbdev->dev, "set_interface failed\n");
> - unlock_kernel();
> return -EINVAL;
> }
> s->opened = 1;
> @@ -654,7 +648,6 @@ static int dabusb_open (struct inode *inode, struct file *file)
> file->private_data = s;
>
> r = nonseekable_open(inode, file);
> - unlock_kernel();
> return r;
> }
>
> @@ -689,17 +682,13 @@ static long dabusb_ioctl (struct file *file, unsigned int cmd, unsigned long arg
>
> dbg("dabusb_ioctl");
>
> - lock_kernel();
> - if (s->remove_pending) {
> - unlock_kernel();
> + if (s->remove_pending)
> return -EIO;
> - }
>
> mutex_lock(&s->mutex);
>
> if (!s->usbdev) {
> mutex_unlock(&s->mutex);
> - unlock_kernel();
> return -EIO;
> }
>
> @@ -735,7 +724,6 @@ static long dabusb_ioctl (struct file *file, unsigned int cmd, unsigned long arg
> break;
> }
> mutex_unlock(&s->mutex);
> - unlock_kernel();
> return ret;
> }
>
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