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staging:iio: Drop buffer mark_param_change callback

Browse Source 
Right now we have a mark_param_change callback in the buffer access
functions struct, which should be called whenever the parameters (length,
bytes per datum) of the buffer change. But it is only called when the user
changes the buffer size, not when the bytes per datum change. Additionally each
buffer implementation already keeps track internally whether its parameters
have changed, making the call to mark_param_change after changing the buffer
length redundant. Since each buffer implementation knows best when one of its
parameters has changed just make tracking of this internal and drop the
mark_param_change callback.

Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Lars-Peter Clausen 2011-12-19 15:23:48 +01:00 committed by Greg Kroah-Hartman
parent 307276cb83
commit 869871b58c
5 changed files with 20 additions and 35 deletions
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2
drivers/staging/iio/Documentation/ring.txt
View File

@ -39,8 +39,6 @@ rip_first_n
The primary buffer reading function. Note that it may well not return
as much data as requested.
mark_param_changed
Used to indicate that something has changed. Used in conjunction with
request_update
If parameters have changed that require reinitialization or configuration of
the buffer this will trigger it.

4
drivers/staging/iio/buffer.h
View File

@ -22,9 +22,6 @@ struct iio_buffer;
* @unmark_in_use: reduce reference count when no longer using buffer
* @store_to: actually store stuff to the buffer
* @read_first_n: try to get a specified number of bytes (must exist)
* @mark_param_change: notify buffer that some relevant parameter has changed
* Often this means the underlying storage may need to
* change.
* @request_update: if a parameter change has been marked, update underlying
* storage.
* @get_bytes_per_datum:get current bytes per datum
@ -49,7 +46,6 @@ struct iio_buffer_access_funcs {
size_t n,
char __user *buf);
int (*mark_param_change)(struct iio_buffer *buffer);
int (*request_update)(struct iio_buffer *buffer);
int (*get_bytes_per_datum)(struct iio_buffer *buffer);

5
drivers/staging/iio/industrialio-buffer.c
View File

@ -399,11 +399,8 @@ ssize_t iio_buffer_write_length(struct device *dev,
if (iio_buffer_enabled(indio_dev)) {
ret = -EBUSY;
} else {
if (buffer->access->set_length) {
if (buffer->access->set_length)
buffer->access->set_length(buffer, val);
if (buffer->access->mark_param_change)
buffer->access->mark_param_change(buffer);
}
ret = 0;
}
mutex_unlock(&indio_dev->mlock);

23
drivers/staging/iio/kfifo_buf.c
View File

@ -109,16 +109,6 @@ static int iio_get_bytes_per_datum_kfifo(struct iio_buffer *r)
return r->bytes_per_datum;
}
static int iio_set_bytes_per_datum_kfifo(struct iio_buffer *r, size_t bpd)
{
if (r->bytes_per_datum != bpd) {
r->bytes_per_datum = bpd;
if (r->access->mark_param_change)
r->access->mark_param_change(r);
}
return 0;
}
static int iio_mark_update_needed_kfifo(struct iio_buffer *r)
{
struct iio_kfifo *kf = iio_to_kfifo(r);
@ -126,12 +116,20 @@ static int iio_mark_update_needed_kfifo(struct iio_buffer *r)
return 0;
}
static int iio_set_bytes_per_datum_kfifo(struct iio_buffer *r, size_t bpd)
{
if (r->bytes_per_datum != bpd) {
r->bytes_per_datum = bpd;
iio_mark_update_needed_kfifo(r);
}
return 0;
}
static int iio_set_length_kfifo(struct iio_buffer *r, int length)
{
if (r->length != length) {
r->length = length;
if (r->access->mark_param_change)
r->access->mark_param_change(r);
iio_mark_update_needed_kfifo(r);
}
return 0;
}
@ -174,7 +172,6 @@ const struct iio_buffer_access_funcs kfifo_access_funcs = {
.unmark_in_use = &iio_unmark_kfifo_in_use,
.store_to = &iio_store_to_kfifo,
.read_first_n = &iio_read_first_n_kfifo,
.mark_param_change = &iio_mark_update_needed_kfifo,
.request_update = &iio_request_update_kfifo,
.get_bytes_per_datum = &iio_get_bytes_per_datum_kfifo,
.set_bytes_per_datum = &iio_set_bytes_per_datum_kfifo,

21
drivers/staging/iio/ring_sw.c
View File

@ -316,12 +316,18 @@ static int iio_get_bytes_per_datum_sw_rb(struct iio_buffer *r)
return ring->buf.bytes_per_datum;
}
static int iio_mark_update_needed_sw_rb(struct iio_buffer *r)
{
struct iio_sw_ring_buffer *ring = iio_to_sw_ring(r);
ring->update_needed = true;
return 0;
}
static int iio_set_bytes_per_datum_sw_rb(struct iio_buffer *r, size_t bpd)
{
if (r->bytes_per_datum != bpd) {
r->bytes_per_datum = bpd;
if (r->access->mark_param_change)
r->access->mark_param_change(r);
iio_mark_update_needed_sw_rb(r);
}
return 0;
}
@ -335,19 +341,11 @@ static int iio_set_length_sw_rb(struct iio_buffer *r, int length)
{
if (r->length != length) {
r->length = length;
if (r->access->mark_param_change)
r->access->mark_param_change(r);
iio_mark_update_needed_sw_rb(r);
}
return 0;
}
static int iio_mark_update_needed_sw_rb(struct iio_buffer *r)
{
struct iio_sw_ring_buffer *ring = iio_to_sw_ring(r);
ring->update_needed = true;
return 0;
}
static IIO_BUFFER_ENABLE_ATTR;
static IIO_BUFFER_LENGTH_ATTR;
@ -392,7 +390,6 @@ const struct iio_buffer_access_funcs ring_sw_access_funcs = {
.unmark_in_use = &iio_unmark_sw_rb_in_use,
.store_to = &iio_store_to_sw_rb,
.read_first_n = &iio_read_first_n_sw_rb,
.mark_param_change = &iio_mark_update_needed_sw_rb,
.request_update = &iio_request_update_sw_rb,
.get_bytes_per_datum = &iio_get_bytes_per_datum_sw_rb,
.set_bytes_per_datum = &iio_set_bytes_per_datum_sw_rb,