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staging: comedi: reduce use of struct comedi_file_info

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Since the parameters of `comedi_read_subdevice()` and
`comedi_write_subdevice()` have changed, there is no longer a need to
keep a local variable `struct comedi_file_info *info` hanging around in
the file operation functions and device attribute access functions.
Remove the variable from those function and replace the call sequence
`info = comedi_file_info_from_minor(minor)`,  `dev =
comedi_dev_from_file_info(info)` with the simpler `dev =
comedi_dev_from_minor(minor)`.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2013-04-04 14:59:11 +01:00 committed by Greg Kroah-Hartman
parent da56fdc6cd
commit 5e04c25435
1 changed files with 22 additions and 42 deletions
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64
drivers/staging/comedi/comedi_fops.c
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@ -286,16 +286,14 @@ static ssize_t show_max_read_buffer_kb(struct device *csdev,
struct device_attribute *attr, char *buf)
{
unsigned int minor = MINOR(csdev->devt);
struct comedi_file_info *info;
struct comedi_device *dev;
struct comedi_subdevice *s;
unsigned int size = 0;
info = comedi_file_info_from_minor(minor);
if (!info)
dev = comedi_dev_from_minor(minor);
if (!dev)
return -ENODEV;
dev = info->device;
mutex_lock(&dev->mutex);
s = comedi_read_subdevice(dev, minor);
if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
@ -310,7 +308,6 @@ static ssize_t store_max_read_buffer_kb(struct device *csdev,
const char *buf, size_t count)
{
unsigned int minor = MINOR(csdev->devt);
struct comedi_file_info *info;
struct comedi_device *dev;
struct comedi_subdevice *s;
unsigned int size;
@ -323,11 +320,10 @@ static ssize_t store_max_read_buffer_kb(struct device *csdev,
return -EINVAL;
size *= 1024;
info = comedi_file_info_from_minor(minor);
if (!info)
dev = comedi_dev_from_minor(minor);
if (!dev)
return -ENODEV;
dev = info->device;
mutex_lock(&dev->mutex);
s = comedi_read_subdevice(dev, minor);
if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
@ -343,16 +339,14 @@ static ssize_t show_read_buffer_kb(struct device *csdev,
struct device_attribute *attr, char *buf)
{
unsigned int minor = MINOR(csdev->devt);
struct comedi_file_info *info;
struct comedi_device *dev;
struct comedi_subdevice *s;
unsigned int size = 0;
info = comedi_file_info_from_minor(minor);
if (!info)
dev = comedi_dev_from_minor(minor);
if (!dev)
return -ENODEV;
dev = info->device;
mutex_lock(&dev->mutex);
s = comedi_read_subdevice(dev, minor);
if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
@ -367,7 +361,6 @@ static ssize_t store_read_buffer_kb(struct device *csdev,
const char *buf, size_t count)
{
unsigned int minor = MINOR(csdev->devt);
struct comedi_file_info *info;
struct comedi_device *dev;
struct comedi_subdevice *s;
unsigned int size;
@ -380,11 +373,10 @@ static ssize_t store_read_buffer_kb(struct device *csdev,
return -EINVAL;
size *= 1024;
info = comedi_file_info_from_minor(minor);
if (!info)
dev = comedi_dev_from_minor(minor);
if (!dev)
return -ENODEV;
dev = info->device;
mutex_lock(&dev->mutex);
s = comedi_read_subdevice(dev, minor);
if (s && (s->subdev_flags & SDF_CMD_READ) && s->async)
@ -401,16 +393,14 @@ static ssize_t show_max_write_buffer_kb(struct device *csdev,
char *buf)
{
unsigned int minor = MINOR(csdev->devt);
struct comedi_file_info *info;
struct comedi_device *dev;
struct comedi_subdevice *s;
unsigned int size = 0;
info = comedi_file_info_from_minor(minor);
if (!info)
dev = comedi_dev_from_minor(minor);
if (!dev)
return -ENODEV;
dev = info->device;
mutex_lock(&dev->mutex);
s = comedi_write_subdevice(dev, minor);
if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
@ -425,7 +415,6 @@ static ssize_t store_max_write_buffer_kb(struct device *csdev,
const char *buf, size_t count)
{
unsigned int minor = MINOR(csdev->devt);
struct comedi_file_info *info;
struct comedi_device *dev;
struct comedi_subdevice *s;
unsigned int size;
@ -438,11 +427,10 @@ static ssize_t store_max_write_buffer_kb(struct device *csdev,
return -EINVAL;
size *= 1024;
info = comedi_file_info_from_minor(minor);
if (!info)
dev = comedi_dev_from_minor(minor);
if (!dev)
return -ENODEV;
dev = info->device;
mutex_lock(&dev->mutex);
s = comedi_write_subdevice(dev, minor);
if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
@ -458,16 +446,14 @@ static ssize_t show_write_buffer_kb(struct device *csdev,
struct device_attribute *attr, char *buf)
{
unsigned int minor = MINOR(csdev->devt);
struct comedi_file_info *info;
struct comedi_device *dev;
struct comedi_subdevice *s;
unsigned int size = 0;
info = comedi_file_info_from_minor(minor);
if (!info)
dev = comedi_dev_from_minor(minor);
if (!dev)
return -ENODEV;
dev = info->device;
mutex_lock(&dev->mutex);
s = comedi_write_subdevice(dev, minor);
if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
@ -482,7 +468,6 @@ static ssize_t store_write_buffer_kb(struct device *csdev,
const char *buf, size_t count)
{
unsigned int minor = MINOR(csdev->devt);
struct comedi_file_info *info;
struct comedi_device *dev;
struct comedi_subdevice *s;
unsigned int size;
@ -495,11 +480,10 @@ static ssize_t store_write_buffer_kb(struct device *csdev,
return -EINVAL;
size *= 1024;
info = comedi_file_info_from_minor(minor);
if (!info)
dev = comedi_dev_from_minor(minor);
if (!dev)
return -ENODEV;
dev = info->device;
mutex_lock(&dev->mutex);
s = comedi_write_subdevice(dev, minor);
if (s && (s->subdev_flags & SDF_CMD_WRITE) && s->async)
@ -1785,8 +1769,7 @@ static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
const unsigned minor = iminor(file_inode(file));
struct comedi_file_info *info = comedi_file_info_from_minor(minor);
struct comedi_device *dev = comedi_dev_from_file_info(info);
struct comedi_device *dev = comedi_dev_from_minor(minor);
int rc;
if (!dev)
@ -1809,6 +1792,7 @@ static long comedi_unlocked_ioctl(struct file *file, unsigned int cmd,
dev->minor >= comedi_num_legacy_minors) {
/* Successfully unconfigured a dynamically
* allocated device. Try and remove it. */
struct comedi_file_info *info;
info = comedi_clear_board_minor(dev->minor);
if (info) {
mutex_unlock(&dev->mutex);
@ -1923,8 +1907,7 @@ static struct vm_operations_struct comedi_vm_ops = {
static int comedi_mmap(struct file *file, struct vm_area_struct *vma)
{
const unsigned minor = iminor(file_inode(file));
struct comedi_file_info *info = comedi_file_info_from_minor(minor);
struct comedi_device *dev = comedi_dev_from_file_info(info);
struct comedi_device *dev = comedi_dev_from_minor(minor);
struct comedi_subdevice *s;
struct comedi_async *async;
unsigned long start = vma->vm_start;
@ -2003,8 +1986,7 @@ static unsigned int comedi_poll(struct file *file, poll_table *wait)
{
unsigned int mask = 0;
const unsigned minor = iminor(file_inode(file));
struct comedi_file_info *info = comedi_file_info_from_minor(minor);
struct comedi_device *dev = comedi_dev_from_file_info(info);
struct comedi_device *dev = comedi_dev_from_minor(minor);
struct comedi_subdevice *s;
if (!dev)
@ -2049,8 +2031,7 @@ static ssize_t comedi_write(struct file *file, const char __user *buf,
int n, m, count = 0, retval = 0;
DECLARE_WAITQUEUE(wait, current);
const unsigned minor = iminor(file_inode(file));
struct comedi_file_info *info = comedi_file_info_from_minor(minor);
struct comedi_device *dev = comedi_dev_from_file_info(info);
struct comedi_device *dev = comedi_dev_from_minor(minor);
if (!dev)
return -ENODEV;
@ -2144,8 +2125,7 @@ static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
int n, m, count = 0, retval = 0;
DECLARE_WAITQUEUE(wait, current);
const unsigned minor = iminor(file_inode(file));
struct comedi_file_info *info = comedi_file_info_from_minor(minor);
struct comedi_device *dev = comedi_dev_from_file_info(info);
struct comedi_device *dev = comedi_dev_from_minor(minor);
if (!dev)
return -ENODEV;