netdev - [PATCH 4/15] drivers/net/ethernet/sfc/ptp.c: adjust duplicate test

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Date:	Mon, 21 Jan 2013 14:02:48 +0100
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Solarflare linux maintainers <linux-net-drivers@...arflare.com>
Cc:	kernel-janitors@...r.kernel.org,
	Ben Hutchings <bhutchings@...arflare.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/15] drivers/net/ethernet/sfc/ptp.c: adjust duplicate test

From: Julia Lawall <Julia.Lawall@...6.fr>

Delete successive tests to the same location.  rc was previously tested and
not subsequently updated.  efx_phc_adjtime can return an error code, so the
call is updated so that is tested instead.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@s exists@
local idexpression y;
expression x,e;
@@

*if ( \(x == NULL\|IS_ERR(x)\|y != 0\) )
 { ... when forall
   return ...; }
... when != \(y = e\|y += e\|y -= e\|y |= e\|y &= e\|y++\|y--\|&y\)
    when != \(XT_GETPAGE(...,y)\|WMI_CMD_BUF(...)\)
*if ( \(x == NULL\|IS_ERR(x)\|y != 0\) )
 { ... when forall
   return ...; }
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
Not tested.  I'm not familiar with this function, so I don't know whether it
is desirable to test its result.

 drivers/net/ethernet/sfc/ptp.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/sfc/ptp.c b/drivers/net/ethernet/sfc/ptp.c
index 0767043..3f93624 100644
--- a/drivers/net/ethernet/sfc/ptp.c
+++ b/drivers/net/ethernet/sfc/ptp.c
@@ -1439,7 +1439,7 @@ static int efx_phc_settime(struct ptp_clock_info *ptp,
 
 	delta = timespec_sub(*e_ts, time_now);
 
-	efx_phc_adjtime(ptp, timespec_to_ns(&delta));
+	rc = efx_phc_adjtime(ptp, timespec_to_ns(&delta));
 	if (rc != 0)
 		return rc;
 

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