From patchwork Wed Jun 16 12:28:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mauro Carvalho Chehab X-Patchwork-Id: 12324975 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E06A0C49361 for ; Wed, 16 Jun 2021 12:28:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CF249613D0 for ; Wed, 16 Jun 2021 12:28:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232951AbhFPMay (ORCPT ); Wed, 16 Jun 2021 08:30:54 -0400 Received: from mail.kernel.org ([198.145.29.99]:49304 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232623AbhFPMaq (ORCPT ); Wed, 16 Jun 2021 08:30:46 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9F401613D3; Wed, 16 Jun 2021 12:28:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1623846520; bh=qiN1R/jymLRTb35TqMu2Vqi01KiKSp/t9ibnV3ARPpY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CKAJ8xCB6m+t0PmJyd97NrWc8V/6eSVq0EvSS0idBcB1dSYcQuv3qV2r4s/z+9pR8 SswpRbBTTn9KRYiDFVzF6loRCeVjJKGqnbDDM3AIEvB89qLiKvs2ftP5+k7iPBDpLF t0S7VmTsqg+GbW9676pPmMYTRvYuX5JM31DHPDXymfn4G9gJMvn6fuNOLZf7EdBcx6 NgaHfLa8+yNaJc7Pp+HgeulYPZwP8CSBK+moq3jl9Hb2SNNnDNZ/noQmzdJrzWhIMz k++YoTrA26R4ygZNP5YVcTmV94cya5mxjR0ucHFtmtCrE1OYxTo/poKIzC1quKj57C bBNL8nLYRMWCw== Received: by mail.kernel.org with local (Exim 4.94.2) (envelope-from ) id 1ltUes-004oiv-FW; Wed, 16 Jun 2021 14:28:38 +0200 From: Mauro Carvalho Chehab Cc: linuxarm@huawei.com, mauro.chehab@huawei.com, Mauro Carvalho Chehab , Allen Pais , Hans Verkuil , Mauro Carvalho Chehab , Romain Perier , dingsenjie , linux-kernel@vger.kernel.org, linux-media@vger.kernel.org Subject: [PATCH 09/11] media: ttusb-dec: cleanup an error handling logic Date: Wed, 16 Jun 2021 14:28:35 +0200 Message-Id: <9d098284e97a5687f857671d1aa8e5716658d50a.1623846327.git.mchehab+huawei@kernel.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 Sender: Mauro Carvalho Chehab To: unlisted-recipients:; (no To-header on input) Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Simplify the logic at ttusb_dec_send_command(). Besides avoiding some code duplication, as a side effect, this could remove this false positive return with spatch: drivers/media/usb/ttusb-dec/ttusb_dec.c:380 ttusb_dec_send_command() warn: inconsistent returns '&dec->usb_mutex'. Locked on : 330 Unlocked on: 354,365,380 Signed-off-by: Mauro Carvalho Chehab --- drivers/media/usb/ttusb-dec/ttusb_dec.c | 25 +++++++++++-------------- 1 file changed, 11 insertions(+), 14 deletions(-) diff --git a/drivers/media/usb/ttusb-dec/ttusb_dec.c b/drivers/media/usb/ttusb-dec/ttusb_dec.c index a852ee5f7ac9..bfda46a36dc5 100644 --- a/drivers/media/usb/ttusb-dec/ttusb_dec.c +++ b/drivers/media/usb/ttusb-dec/ttusb_dec.c @@ -324,10 +324,10 @@ static int ttusb_dec_send_command(struct ttusb_dec *dec, const u8 command, if (!b) return -ENOMEM; - if ((result = mutex_lock_interruptible(&dec->usb_mutex))) { - kfree(b); + result = mutex_lock_interruptible(&dec->usb_mutex); + if (result) { printk("%s: Failed to lock usb mutex.\n", __func__); - return result; + goto err; } b[0] = 0xaa; @@ -349,9 +349,7 @@ static int ttusb_dec_send_command(struct ttusb_dec *dec, const u8 command, if (result) { printk("%s: command bulk message failed: error %d\n", __func__, result); - mutex_unlock(&dec->usb_mutex); - kfree(b); - return result; + goto err; } result = usb_bulk_msg(dec->udev, dec->result_pipe, b, @@ -360,9 +358,7 @@ static int ttusb_dec_send_command(struct ttusb_dec *dec, const u8 command, if (result) { printk("%s: result bulk message failed: error %d\n", __func__, result); - mutex_unlock(&dec->usb_mutex); - kfree(b); - return result; + goto err; } else { if (debug) { printk(KERN_DEBUG "%s: result: %*ph\n", @@ -373,12 +369,13 @@ static int ttusb_dec_send_command(struct ttusb_dec *dec, const u8 command, *result_length = b[3]; if (cmd_result && b[3] > 0) memcpy(cmd_result, &b[4], b[3]); - - mutex_unlock(&dec->usb_mutex); - - kfree(b); - return 0; } + +err: + mutex_unlock(&dec->usb_mutex); + + kfree(b); + return result; } static int ttusb_dec_get_stb_state (struct ttusb_dec *dec, unsigned int *mode,