diff options
Diffstat (limited to 'drivers/staging/comedi/comedi_buf.c')
-rw-r--r-- | drivers/staging/comedi/comedi_buf.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/staging/comedi/comedi_buf.c b/drivers/staging/comedi/comedi_buf.c index 95cbe365ded..fd2a92e29fb 100644 --- a/drivers/staging/comedi/comedi_buf.c +++ b/drivers/staging/comedi/comedi_buf.c @@ -252,11 +252,12 @@ static unsigned int comedi_buf_munge(struct comedi_async *async, /* transfers a chunk from writer to filled buffer space */ unsigned comedi_buf_write_free(struct comedi_async *async, unsigned int nbytes) { - if ((int)(async->buf_write_count + nbytes - - async->buf_write_alloc_count) > 0) { + unsigned int allocated = comedi_buf_write_n_allocated(async); + + if (nbytes > allocated) { dev_info(async->subdevice->device->class_dev, "attempted to write-free more bytes than have been write-allocated.\n"); - nbytes = async->buf_write_alloc_count - async->buf_write_count; + nbytes = allocated; } async->buf_write_count += nbytes; async->buf_write_ptr += nbytes; |