----- Forwarded message from Colin King <colin.k...@canonical.com> -----

Date: Tue,  8 Aug 2017 10:52:32 +0100
From: Colin King <colin.k...@canonical.com>
To: Andrew Lunn <and...@lunn.ch>, Florian Fainelli <f.faine...@gmail.com>, 
Cc: kernel-janit...@vger.kernel.org, linux-ker...@vger.kernel.org
Subject: [PATCH][next] net: phy: mdio-bcm-unimac: fix unsigned wrap-around when 
decrementing timeout
X-Spam-Status: No, score=-7.4 required=4.0 tests=BAYES_00,RCVD_IN_DNSWL_HI, 
        autolearn_force=no version=3.4.0

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

Change post-decrement compare to pre-decrement to avoid an
unsigned integer wrap-around on timeout. This leads to the following
!timeout check to never to be true so -ETIMEDOUT is never returned.

Detected by CoverityScan, CID#1452623 ("Logically dead code")

Fixes: 69a60b0579a4 ("net: phy: mdio-bcm-unimac: factor busy polling loop")
Signed-off-by: Colin Ian King <colin.k...@canonical.com>
 drivers/net/phy/mdio-bcm-unimac.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/phy/mdio-bcm-unimac.c 
index 89425ca48412..73c5267a11fd 100644
--- a/drivers/net/phy/mdio-bcm-unimac.c
+++ b/drivers/net/phy/mdio-bcm-unimac.c
@@ -71,7 +71,7 @@ static int unimac_mdio_poll(void *wait_func_data)
                        return 0;
                usleep_range(1000, 2000);
-       } while (timeout--);
+       } while (--timeout);
        if (!timeout)
                return -ETIMEDOUT;

----- End forwarded message -----

Hi Florian

You might want to look at bcm_sf2_cfp_op() and bcm_sf2_cfp_rst().

Colin, do you have more of these patches? Have you done a tree wide


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