[PATCH 3.18 008/120] net: hp100: fix always-true check for link up state

Greg Kroah-Hartman
2018-10-11T15:36:46Z

From: Colin Ian King <colin.king@canonical.com>

[ Upstream commit a7f38002fb69b44f8fc622ecb838665d0b8666af ]

The operation ~(p100_inb(VG_LAN_CFG_1) & HP100_LINK_UP) returns a value
that is always non-zero and hence the wait for the link to drop always
terminates prematurely. Fix this by using a logical not operator instead
of a bitwise complement. This issue has been in the driver since
pre-2.6.12-rc2.

Detected by CoverityScan, CID#114157 ("Logical vs. bitwise operator")

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/hp/hp100.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/ethernet/hp/hp100.c
+++ b/drivers/net/ethernet/hp/hp100.c
@@ -2637,7 +2637,7 @@ static int hp100_login_to_vg_hub(struct
/* Wait for link to drop */
time = jiffies + (HZ / 10);
do {
- if (~(hp100_inb(VG_LAN_CFG_1) & HP100_LINK_UP_ST))
+ if (!(hp100_inb(VG_LAN_CFG_1) & HP100_LINK_UP_ST))
break;
if (!in_interrupt())
schedule_timeout_interruptible(1);