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 | 9 +++------
1 file changed, 3 insertions(+), 6 deletions(-)
diff --git a/drivers/staging/comedi/comedi_buf.c b/drivers/staging/comedi/comedi_buf.c
index 1ec5aaa..5be9930 100644
--- a/drivers/staging/comedi/comedi_buf.c
+++ b/drivers/staging/comedi/comedi_buf.c
@@ -182,13 +182,10 @@ static unsigned int __comedi_buf_write_alloc(struct comedi_async *async,
int strict)
{
unsigned int free_end = async->buf_read_count + async->prealloc_bufsz;
+ int available = free_end - async->buf_write_alloc_count;
- if ((int)(async->buf_write_alloc_count + nbytes - free_end) > 0) {
- if (strict)
- nbytes = 0;
- else
- nbytes = free_end - async->buf_write_alloc_count;
- }
+ if (nbytes > available)
+ nbytes = strict ? 0 : available;
async->buf_write_alloc_count += nbytes;
/* barrier insures the read of buf_read_count above occurs before
--
1.8.0
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