staging: comedi: pass subdevice to comedi_buf_read_free()

Change the parameters of `comedi_buf_read_free()` to pass a pointer to
the comedi subdevice instead of a pointer to the "async" structure
belonging to the subdevice.

The main aim at the moment is to replace all the `struct comedi_async *`
parameters with `struct comedi_subdevice *` parameters in the comedi
driver API.

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>

diff --git a/drivers/staging/comedi/comedi_buf.c b/drivers/staging/comedi/comedi_buf.c
index 07e0b3a..a3c3f21 100644 (file)
--- a/drivers/staging/comedi/comedi_buf.c
+++ b/drivers/staging/comedi/comedi_buf.c
@@ -398,9 +398,10 @@ static unsigned int comedi_buf_read_n_allocated(struct comedi_async *async)
 }
 
 /* transfers control of a chunk from reader to free buffer space */
-unsigned int comedi_buf_read_free(struct comedi_async *async,
+unsigned int comedi_buf_read_free(struct comedi_subdevice *s,
                                  unsigned int nbytes)
 {
+       struct comedi_async *async = s->async;
        unsigned int allocated;
 
        /*
@@ -444,7 +445,7 @@ int comedi_buf_get(struct comedi_subdevice *s, unsigned short *x)
                return 0;
        comedi_buf_read_alloc(s, sizeof(short));
        *x = *(unsigned short *)(async->prealloc_buf + async->buf_read_ptr);
-       comedi_buf_read_free(async, sizeof(short));
+       comedi_buf_read_free(s, sizeof(short));
        return 1;
 }
 EXPORT_SYMBOL_GPL(comedi_buf_get);

diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 5164374..365e191 100644 (file)
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -994,7 +994,7 @@ static int do_bufinfo_ioctl(struct comedi_device *dev,
 
        if (bi.bytes_read && (s->subdev_flags & SDF_CMD_READ)) {
                bi.bytes_read = comedi_buf_read_alloc(s, bi.bytes_read);
-               comedi_buf_read_free(async, bi.bytes_read);
+               comedi_buf_read_free(s, bi.bytes_read);
 
                if (comedi_is_subdevice_idle(s) &&
                    async->buf_write_count == async->buf_read_count) {
@@ -2273,7 +2273,7 @@ static ssize_t comedi_read(struct file *file, char __user *buf, size_t nbytes,
                }
 
                comedi_buf_read_alloc(s, n);
-               comedi_buf_read_free(async, n);
+               comedi_buf_read_free(s, n);
 
                count += n;
                nbytes -= n;

diff --git a/drivers/staging/comedi/comedidev.h b/drivers/staging/comedi/comedidev.h
index d2131f2..c481620 100644 (file)
--- a/drivers/staging/comedi/comedidev.h
+++ b/drivers/staging/comedi/comedidev.h
@@ -341,7 +341,7 @@ unsigned int comedi_buf_write_free(struct comedi_subdevice *s, unsigned int n);
 
 unsigned int comedi_buf_read_n_available(struct comedi_async *);
 unsigned int comedi_buf_read_alloc(struct comedi_subdevice *s, unsigned int n);
-unsigned int comedi_buf_read_free(struct comedi_async *, unsigned int);
+unsigned int comedi_buf_read_free(struct comedi_subdevice *s, unsigned int n);
 
 int comedi_buf_put(struct comedi_subdevice *s, unsigned short x);
 int comedi_buf_get(struct comedi_subdevice *s, unsigned short *x);

diff --git a/drivers/staging/comedi/drivers/comedi_fc.c b/drivers/staging/comedi/drivers/comedi_fc.c
index 836eb1a..cf3da2c 100644 (file)
--- a/drivers/staging/comedi/drivers/comedi_fc.c
+++ b/drivers/staging/comedi/drivers/comedi_fc.c
@@ -86,16 +86,14 @@ EXPORT_SYMBOL_GPL(cfc_write_array_to_buffer);
 unsigned int cfc_read_array_from_buffer(struct comedi_subdevice *s,
                                        void *data, unsigned int num_bytes)
 {
-       struct comedi_async *async = s->async;
-
        if (num_bytes == 0)
                return 0;
 
        num_bytes = comedi_buf_read_alloc(s, num_bytes);
        comedi_buf_memcpy_from(s, 0, data, num_bytes);
-       comedi_buf_read_free(async, num_bytes);
+       comedi_buf_read_free(s, num_bytes);
        cfc_inc_scan_progress(s, num_bytes);
-       async->events |= COMEDI_CB_BLOCK;
+       s->async->events |= COMEDI_CB_BLOCK;
 
        return num_bytes;
 }

diff --git a/drivers/staging/comedi/drivers/mite.c b/drivers/staging/comedi/drivers/mite.c
index d1423ca..6c8bd7c 100644 (file)
--- a/drivers/staging/comedi/drivers/mite.c
+++ b/drivers/staging/comedi/drivers/mite.c
@@ -588,7 +588,7 @@ int mite_sync_output_dma(struct mite_channel *mite_chan,
                return 0;
 
        if (count) {
-               comedi_buf_read_free(async, count);
+               comedi_buf_read_free(s, count);
                async->events |= COMEDI_CB_BLOCK;
        }
        return 0;