From cbe88bcc8ec2f7d6739ea67d7c91517139f0a491 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Thu, 17 Jul 2014 16:59:00 +0100 Subject: [PATCH] iio: buffer: Coalesce adjacent demux table entries When copying multiple multiple samples that are adjacent in both the source as well as the destination buffer, instead of creating a new demux table entry for each sample just increase the length of the previous entry by the size of the new sample. This makes the demuxing process slightly more efficient. Signed-off-by: Lars-Peter Clausen Signed-off-by: Jonathan Cameron --- drivers/iio/industrialio-buffer.c | 47 ++++++++++++++++++------------- 1 file changed, 28 insertions(+), 19 deletions(-) diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c index 7462f1233974..84a952931f9f 100644 --- a/drivers/iio/industrialio-buffer.c +++ b/drivers/iio/industrialio-buffer.c @@ -942,13 +942,34 @@ int iio_push_to_buffers(struct iio_dev *indio_dev, const void *data) } EXPORT_SYMBOL_GPL(iio_push_to_buffers); +static int iio_buffer_add_demux(struct iio_buffer *buffer, + struct iio_demux_table **p, unsigned int in_loc, unsigned int out_loc, + unsigned int length) +{ + + if (*p && (*p)->from + (*p)->length == in_loc && + (*p)->to + (*p)->length == out_loc) { + (*p)->length += length; + } else { + *p = kmalloc(sizeof(*p), GFP_KERNEL); + if (*p == NULL) + return -ENOMEM; + (*p)->from = in_loc; + (*p)->to = out_loc; + (*p)->length = length; + list_add_tail(&(*p)->l, &buffer->demux_list); + } + + return 0; +} + static int iio_buffer_update_demux(struct iio_dev *indio_dev, struct iio_buffer *buffer) { const struct iio_chan_spec *ch; int ret, in_ind = -1, out_ind, length; unsigned in_loc = 0, out_loc = 0; - struct iio_demux_table *p; + struct iio_demux_table *p = NULL; /* Clear out any old demux */ iio_buffer_demux_free(buffer); @@ -981,11 +1002,6 @@ static int iio_buffer_update_demux(struct iio_dev *indio_dev, /* Make sure we are aligned */ in_loc = roundup(in_loc, length) + length; } - p = kmalloc(sizeof(*p), GFP_KERNEL); - if (p == NULL) { - ret = -ENOMEM; - goto error_clear_mux_table; - } ch = iio_find_channel_from_si(indio_dev, in_ind); if (ch->scan_type.repeat > 1) length = ch->scan_type.storagebits / 8 * @@ -994,20 +1010,14 @@ static int iio_buffer_update_demux(struct iio_dev *indio_dev, length = ch->scan_type.storagebits / 8; out_loc = roundup(out_loc, length); in_loc = roundup(in_loc, length); - p->from = in_loc; - p->to = out_loc; - p->length = length; - list_add_tail(&p->l, &buffer->demux_list); + ret = iio_buffer_add_demux(buffer, &p, in_loc, out_loc, length); + if (ret) + goto error_clear_mux_table; out_loc += length; in_loc += length; } /* Relies on scan_timestamp being last */ if (buffer->scan_timestamp) { - p = kmalloc(sizeof(*p), GFP_KERNEL); - if (p == NULL) { - ret = -ENOMEM; - goto error_clear_mux_table; - } ch = iio_find_channel_from_si(indio_dev, indio_dev->scan_index_timestamp); if (ch->scan_type.repeat > 1) @@ -1017,10 +1027,9 @@ static int iio_buffer_update_demux(struct iio_dev *indio_dev, length = ch->scan_type.storagebits / 8; out_loc = roundup(out_loc, length); in_loc = roundup(in_loc, length); - p->from = in_loc; - p->to = out_loc; - p->length = length; - list_add_tail(&p->l, &buffer->demux_list); + ret = iio_buffer_add_demux(buffer, &p, in_loc, out_loc, length); + if (ret) + goto error_clear_mux_table; out_loc += length; in_loc += length; } -- 2.39.5