Clarify the check to make sure the number of bytes to allocate is
available.
Signed-off-by: H Hartley Sweeten <hsweeten@xxxxxxxxxxxxxxxxxxx>
Cc: Ian Abbott <abbobbi@xxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/comedi/comedi_buf.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/staging/comedi/comedi_buf.c b/drivers/staging/comedi/comedi_buf.c
index 246f577..1ec5aaa 100644
--- a/drivers/staging/comedi/comedi_buf.c
+++ b/drivers/staging/comedi/comedi_buf.c
@@ -298,10 +298,10 @@ EXPORT_SYMBOL(comedi_buf_read_n_available);
/* allocates a chunk for the reader from filled (and munged) buffer space */
unsigned comedi_buf_read_alloc(struct comedi_async *async, unsigned nbytes)
{
- if ((int)(async->buf_read_alloc_count + nbytes - async->munge_count) >
- 0) {
- nbytes = async->munge_count - async->buf_read_alloc_count;
- }
+ int available = async->munge_count - async->buf_read_alloc_count;
+
+ if (nbytes > available)
+ nbytes = available;
async->buf_read_alloc_count += nbytes;
/* barrier insures read of munge_count occurs before we actually read
data out of buffer */
--
1.8.0
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