Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751634AbaANTpl (ORCPT ); Tue, 14 Jan 2014 14:45:41 -0500 Received: from cpsmtpb-ews04.kpnxchange.com ([213.75.39.7]:59314 "EHLO cpsmtpb-ews04.kpnxchange.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751481AbaANTpj (ORCPT ); Tue, 14 Jan 2014 14:45:39 -0500 Message-ID: <1389728736.28068.8.camel@x220> Subject: [PATCH v2 1/2] net/mlx4_core: clean up cq_res_start_move_to() From: Paul Bolle To: Or Gerlitz , Jack Morgenstein , Rony Efraim , Hadar Hen Zion , "David S. Miller" Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Date: Tue, 14 Jan 2014 20:45:36 +0100 In-Reply-To: <20140114084752.1db64b21@jpm-OptiPlex-GX620> References: <1389099678.15032.19.camel@x41> <20140114084752.1db64b21@jpm-OptiPlex-GX620> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.10.3 (3.10.3-1.fc20) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 14 Jan 2014 19:45:38.0030 (UTC) FILETIME=[32E370E0:01CF1161] X-RcptDomain: vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Building resource_tracker.o triggers a GCC warning: drivers/net/ethernet/mellanox/mlx4/resource_tracker.c: In function 'mlx4_HW2SW_CQ_wrapper': drivers/net/ethernet/mellanox/mlx4/resource_tracker.c:3019:16: warning: 'cq' may be used uninitialized in this function [-Wmaybe-uninitialized] atomic_dec(&cq->mtt->ref_count); ^ This is a false positive. But a cleanup of cq_res_start_move_to() can help GCC here. The code currently uses a switch statement where an if/else construct would do too, since only two of the switch's four cases can ever occur. Dropping that switch makes the warning go away. While we're at it, add some missing braces. Signed-off-by: Paul Bolle --- v2: adjust to Jack's review. .../net/ethernet/mellanox/mlx4/resource_tracker.c | 52 ++++++++-------------- 1 file changed, 19 insertions(+), 33 deletions(-) diff --git a/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c b/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c index 2f3f2bc..15cd659 100644 --- a/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c +++ b/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c @@ -1340,43 +1340,29 @@ static int cq_res_start_move_to(struct mlx4_dev *dev, int slave, int cqn, spin_lock_irq(mlx4_tlock(dev)); r = res_tracker_lookup(&tracker->res_tree[RES_CQ], cqn); - if (!r) + if (!r) { err = -ENOENT; - else if (r->com.owner != slave) + } else if (r->com.owner != slave) { err = -EPERM; - else { - switch (state) { - case RES_CQ_BUSY: - err = -EBUSY; - break; - - case RES_CQ_ALLOCATED: - if (r->com.state != RES_CQ_HW) - err = -EINVAL; - else if (atomic_read(&r->ref_count)) - err = -EBUSY; - else - err = 0; - break; - - case RES_CQ_HW: - if (r->com.state != RES_CQ_ALLOCATED) - err = -EINVAL; - else - err = 0; - break; - - default: + } else if (state == RES_CQ_ALLOCATED) { + if (r->com.state != RES_CQ_HW) err = -EINVAL; - } + else if (atomic_read(&r->ref_count)) + err = -EBUSY; + else + err = 0; + } else if (state != RES_CQ_HW || r->com.state != RES_CQ_ALLOCATED) { + err = -EINVAL; + } else { + err = 0; + } - if (!err) { - r->com.from_state = r->com.state; - r->com.to_state = state; - r->com.state = RES_CQ_BUSY; - if (cq) - *cq = r; - } + if (!err) { + r->com.from_state = r->com.state; + r->com.to_state = state; + r->com.state = RES_CQ_BUSY; + if (cq) + *cq = r; } spin_unlock_irq(mlx4_tlock(dev)); -- 1.8.4.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/