diff options
Diffstat (limited to 'drivers/staging/comedi/comedi_fops.c')
| -rw-r--r-- | drivers/staging/comedi/comedi_fops.c | 13 |
1 files changed, 5 insertions, 8 deletions
diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c index 188a12a02ce7..8c784c483c3e 100644 --- a/drivers/staging/comedi/comedi_fops.c +++ b/drivers/staging/comedi/comedi_fops.c @@ -2357,16 +2357,13 @@ static ssize_t comedi_write(struct file *file, const char __user *buf, break; } - n = nbytes; - - m = n; + /* Allocate all free buffer space. */ + comedi_buf_write_alloc(s, async->prealloc_bufsz); + m = comedi_buf_write_n_allocated(s); + /* Avoid buffer wraparound. */ if (async->buf_write_ptr + m > async->prealloc_bufsz) m = async->prealloc_bufsz - async->buf_write_ptr; - comedi_buf_write_alloc(s, async->prealloc_bufsz); - if (m > comedi_buf_write_n_allocated(s)) - m = comedi_buf_write_n_allocated(s); - if (m < n) - n = m; + n = min_t(size_t, m, nbytes); if (n == 0) { if (file->f_flags & O_NONBLOCK) { |