diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2010-10-04 21:24:14 +0200 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2010-10-19 11:30:00 +0200 |
| commit | 7ff52efdca367d4bfe2449bd3d4a1f8172c5953a (patch) | |
| tree | 366c821a09266b102857450794718c26f558a21b | |
| parent | sunrpc: remove the big kernel lock (diff) | |
| download | linux-7ff52efdca367d4bfe2449bd3d4a1f8172c5953a.tar.xz linux-7ff52efdca367d4bfe2449bd3d4a1f8172c5953a.zip | |
dabusb: remove the BKL
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@arndb.de>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
| -rw-r--r-- | drivers/media/video/dabusb.c | 18 |
1 files changed, 3 insertions, 15 deletions
diff --git a/drivers/media/video/dabusb.c b/drivers/media/video/dabusb.c index 5b176bd7afdb..f3e25e91366d 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; } |