[PATCH 4.1 126/159] net/xen-netback: off by one in BUG_ON() condition

Greg Kroah-Hartman
2015-09-26T21:29:14Z

From: Dan Carpenter <dan.carpenter@oracle.com>

[ Upstream commit 50c2e4dd6749725338621fff456b26d3a592259f ]

The > should be >=. I also added spaces around the '-' operations so
the code is a little more consistent and matches the condition better.

Fixes: f53c3fe8dad7 ('xen-netback: Introduce TX grant mapping')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/xen-netback/netback.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -1571,13 +1571,13 @@ static inline void xenvif_tx_dealloc_act
smp_rmb();

while (dc != dp) {
- BUG_ON(gop - queue->tx_unmap_ops > MAX_PENDING_REQS);
+ BUG_ON(gop - queue->tx_unmap_ops >= MAX_PENDING_REQS);
pending_idx =
queue->dealloc_ring[pending_index(dc++)];

- pending_idx_release[gop-queue->tx_unmap_ops] =
+ pending_idx_release[gop - queue->tx_unmap_ops] =
pending_idx;
- queue->pages_to_unmap[gop-queue->tx_unmap_ops] =
+ queue->pages_to_unmap[gop - queue->tx_unmap_ops] =
queue->mmap_pages[pending_idx];
gnttab_set_unmap_op(gop,
idx_to_kaddr(queue, pending_idx),