staging:iio: Drop buffer mark_param_change callback

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>

diff --git a/drivers/staging/iio/Documentation/ring.txt b/drivers/staging/iio/Documentation/ring.txt
index 1b77aeef17908c09ca260fde0af950a6532426ed..0f21479ef4ef02b79e43cbb8517d644569165526 100644 (file)
--- a/drivers/staging/iio/Documentation/ring.txt
+++ b/drivers/staging/iio/Documentation/ring.txt
@@ -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.

diff --git a/drivers/staging/iio/buffer.h b/drivers/staging/iio/buffer.h
index b0e04df1b54e791c3ca24eba7914429837bb39e2..ea42b5d27e31220a4fcf3acb91ffdf85217f5081 100644 (file)
--- a/drivers/staging/iio/buffer.h
+++ b/drivers/staging/iio/buffer.h
@@ -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);

diff --git a/drivers/staging/iio/industrialio-buffer.c b/drivers/staging/iio/industrialio-buffer.c
index 4c6d183509f5713cb31c75117e9966722171bbf3..d2858ff8aa0ea70925f5d234082bea2c0b3673ec 100644 (file)
--- a/drivers/staging/iio/industrialio-buffer.c
+++ b/drivers/staging/iio/industrialio-buffer.c
@@ -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);

diff --git a/drivers/staging/iio/kfifo_buf.c b/drivers/staging/iio/kfifo_buf.c
index b69cca5e43ca997d62b70f906e1873d46d08dbc4..bae4caf4fce1ea2cd0e1850a9061d0ba0042d116 100644 (file)
--- a/drivers/staging/iio/kfifo_buf.c
+++ b/drivers/staging/iio/kfifo_buf.c
@@ -109,20 +109,19 @@ 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)
+static int iio_mark_update_needed_kfifo(struct iio_buffer *r)
 {
-       if (r->bytes_per_datum != bpd) {
-               r->bytes_per_datum = bpd;
-               if (r->access->mark_param_change)
-                       r->access->mark_param_change(r);
-       }
+       struct iio_kfifo *kf = iio_to_kfifo(r);
+       kf->update_needed = true;
        return 0;
 }
 
-static int iio_mark_update_needed_kfifo(struct iio_buffer *r)
+static int iio_set_bytes_per_datum_kfifo(struct iio_buffer *r, size_t bpd)
 {
-       struct iio_kfifo *kf = iio_to_kfifo(r);
-       kf->update_needed = true;
+       if (r->bytes_per_datum != bpd) {
+               r->bytes_per_datum = bpd;
+               iio_mark_update_needed_kfifo(r);
+       }
        return 0;
 }
 
@@ -130,8 +129,7 @@ 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,

diff --git a/drivers/staging/iio/ring_sw.c b/drivers/staging/iio/ring_sw.c
index 4c15cc8e7269299a0100090a871d49e34b75a276..c239fd3af4a3b3f75015344abb9f219d7b2ebec2 100644 (file)
--- a/drivers/staging/iio/ring_sw.c
+++ b/drivers/staging/iio/ring_sw.c
@@ -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,