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| author | K. Y. Srinivasan | 2011-05-10 16:55:31 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2011-05-11 22:49:08 +0200 |
| commit | 8f1136aeb474b14db8f420d4919759b46993830b (patch) | |
| tree | 9d55c81b4cbd76124d95e40482140158e25d8b2a /drivers/staging/hv/ring_buffer.c | |
| parent | Staging: hv: Cleanup comments in ring_buffer.c (diff) | |
| download | kernel-qcow2-linux-8f1136aeb474b14db8f420d4919759b46993830b.tar.gz kernel-qcow2-linux-8f1136aeb474b14db8f420d4919759b46993830b.tar.xz kernel-qcow2-linux-8f1136aeb474b14db8f420d4919759b46993830b.zip | |
Staging: hv: Get rid of the forward declaration of hv_copyfrom_ringbuffer
Get rid of the forward declaration by moving code around.
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Abhishek Kane <v-abkane@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/staging/hv/ring_buffer.c')
| -rw-r--r-- | drivers/staging/hv/ring_buffer.c | 83 |
1 files changed, 37 insertions, 46 deletions
diff --git a/drivers/staging/hv/ring_buffer.c b/drivers/staging/hv/ring_buffer.c index 8544516a7127..56521fd3c890 100644 --- a/drivers/staging/hv/ring_buffer.c +++ b/drivers/staging/hv/ring_buffer.c @@ -199,6 +199,43 @@ void hv_dump_ring_info(struct hv_ring_buffer_info *ring_info, char *prefix) } +/* + * + * hv_copyfrom_ringbuffer() + * + * Helper routine to copy to source from ring buffer. + * Assume there is enough room. Handles wrap-around in src case only!! + * + */ +static u32 hv_copyfrom_ringbuffer( + struct hv_ring_buffer_info *ring_info, + void *dest, + u32 destlen, + u32 start_read_offset) +{ + void *ring_buffer = hv_get_ring_buffer(ring_info); + u32 ring_buffer_size = hv_get_ring_buffersize(ring_info); + + u32 frag_len; + + /* wrap-around detected at the src */ + if (destlen > ring_buffer_size - start_read_offset) { + frag_len = ring_buffer_size - start_read_offset; + + memcpy(dest, ring_buffer + start_read_offset, frag_len); + memcpy(dest + frag_len, ring_buffer, destlen - frag_len); + } else + + memcpy(dest, ring_buffer + start_read_offset, destlen); + + + start_read_offset += destlen; + start_read_offset %= ring_buffer_size; + + return start_read_offset; +} + + static u32 hv_copyto_ringbuffer( @@ -207,14 +244,6 @@ hv_copyto_ringbuffer( void *src, u32 srclen); -static u32 -hv_copyfrom_ringbuffer( - struct hv_ring_buffer_info *ring_info, - void *dest, - u32 destlen, - u32 start_read_offset); - - /* * @@ -504,41 +533,3 @@ hv_copyto_ringbuffer( return start_write_offset; } - -/* - * - * hv_copyfrom_ringbuffer() - * - * Helper routine to copy to source from ring buffer. - * Assume there is enough room. Handles wrap-around in src case only!! - * - */ -static u32 -hv_copyfrom_ringbuffer( - struct hv_ring_buffer_info *ring_info, - void *dest, - u32 destlen, - u32 start_read_offset) -{ - void *ring_buffer = hv_get_ring_buffer(ring_info); - u32 ring_buffer_size = hv_get_ring_buffersize(ring_info); - - u32 frag_len; - - /* wrap-around detected at the src */ - if (destlen > ring_buffer_size - start_read_offset) { - frag_len = ring_buffer_size - start_read_offset; - - memcpy(dest, ring_buffer + start_read_offset, frag_len); - memcpy(dest + frag_len, ring_buffer, destlen - frag_len); - } else - - memcpy(dest, ring_buffer + start_read_offset, destlen); - - - start_read_offset += destlen; - start_read_offset %= ring_buffer_size; - - return start_read_offset; -} - |