From patchwork Fri Feb 25 08:45:26 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 12759896 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 00432C433F5 for ; Fri, 25 Feb 2022 08:45:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238173AbiBYIqE (ORCPT ); Fri, 25 Feb 2022 03:46:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34118 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237600AbiBYIqC (ORCPT ); Fri, 25 Feb 2022 03:46:02 -0500 Received: from esa1.hgst.iphmx.com (esa1.hgst.iphmx.com [68.232.141.245]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 427AA22323A for ; Fri, 25 Feb 2022 00:45:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1645778731; x=1677314731; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=3BXTpLwW6enbyI6SqOzI53k+uPSfm0gdABqmZpONjuw=; b=KQ0S2Ylq6LfJDcZf58MICQWB/Zdg82izB1PQW9axSktzl4HBGeAS2YsS S2DHVMY8K5ifXwurrTogtwQ2NaDRdndAOm8c6zC8Xd3Swr2TC2ZFZgwmA 5p5SRyFehnb3fZ0e5hciWO6OVz5OqD3NslOIF0klG2TmMDxtShiTsB2v5 B9doLaWhlQAp09FfXCP29ml1WVDEFj+OjYAtWdVfz5r3mhflTdcj4GXkJ 3oxYP7VzHejvH5JfoXuL4CJLCd7k1pd6S8lwYBwh82QXqOkVpK9j0G1l+ LaBVCVqLZza6LmKCzz3mWk9bNr1yFnMnwNWoZ0XZMiXCJld6JLHiNbDZf Q==; X-IronPort-AV: E=Sophos;i="5.90,136,1643644800"; d="scan'208";a="305831613" Received: from h199-255-45-14.hgst.com (HELO uls-op-cesaep01.wdc.com) ([199.255.45.14]) by ob1.hgst.iphmx.com with ESMTP; 25 Feb 2022 16:45:30 +0800 IronPort-SDR: dX5YZkTkYfnEYmN27FWT6guS50rk6mhzf5ktF2nQqUqOZvqll9flyA2jAYV8DZPOeCGWLanr0A k70iVYgZES7SdFPAi646c7WfKlTcZih0sts6UI24uepUIkBD14iKdLSHbofCBFWumxGh+uUSgo KP/tRo2PFFxJHKXEtJH6yYaIkyHqquPVJ9bUN48jLoXCKsm6wlYi2nczMxlPDwJDjqo/GTW7Tl KV0Nz3ZGlzEgrMaL3fs7OzZN3GGfcfWdR5BnnSgPegtC7mRxCMCaVLRJlhVewAk8/6AMHW4B7Q /Vfmqdw3vvAD6Ox8qZcNBBjx Received: from uls-op-cesaip01.wdc.com ([10.248.3.36]) by uls-op-cesaep01.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Feb 2022 00:18:05 -0800 IronPort-SDR: f3AJOQ1xHCz16nT2PZFq5KHvQFa8GZcUdlT1I15Q2VjtcbK41s1bBxQWIbfThIrVMfw8DQmNWO XTiWQGZCIRX8XezyEUtl7vKeHzjtzxQZ4J14KUWhHx2ixrbMIXizGTSJa559hthyc1cKxyaocX s2a76SKNpLvl/z74dDA5od/mtXMXVSP2rBqEO0qzpwEwkllhSQha4/upNRelLDTH9I8QvmGElg QANi7rPm/90tJXob9QAtgXy29ykQ7TX2idq5S8MJKG4DBDE8a1I3WKQKENdifAYOqja0Gu5/5G kX4= WDCIronportException: Internal Received: from usg-ed-osssrv.wdc.com ([10.3.10.180]) by uls-op-cesaip01.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Feb 2022 00:45:31 -0800 Received: from usg-ed-osssrv.wdc.com (usg-ed-osssrv.wdc.com [127.0.0.1]) by usg-ed-osssrv.wdc.com (Postfix) with ESMTP id 4K4jyy3Hvjz1SVny for ; Fri, 25 Feb 2022 00:45:30 -0800 (PST) Authentication-Results: usg-ed-osssrv.wdc.com (amavisd-new); dkim=pass reason="pass (just generated, assumed good)" header.d=opensource.wdc.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d= opensource.wdc.com; h=content-transfer-encoding:mime-version :references:in-reply-to:x-mailer:message-id:date:subject:to :from; s=dkim; t=1645778730; x=1648370731; bh=3BXTpLwW6enbyI6SqO zI53k+uPSfm0gdABqmZpONjuw=; b=l9eT5Llfz62ykr/SZKmU2PbEMlonkyXdCF D5L/XOtfeL9LG+3t+uP5EPqYpr7ghwZ8bUwwnE9Xy3XX5SCmA+mj98xeoIC20ewq YMcOyR6UbBdFP+ude5BLrg13qTk4W0AI+5MuXPl3qcxBhH7z3BDbpCrrKkpRZqpz ulU/lcBmymdqxiEmof+cGT/oMol9yAj/haaf/V7TJI4nBiGQP3DYPwBSR8eKKAFQ bgzQhijrzEF1/4H7wP0apctZH1h1E/zLDFVtYWHVVdcNz5f8+9QL7ygNCJl/c/qE D+bYEgXdV/AJ1UIZGUboW+dfqrxfAOmh4v34YQChJ9iY1Z2JSqqg== X-Virus-Scanned: amavisd-new at usg-ed-osssrv.wdc.com Received: from usg-ed-osssrv.wdc.com ([127.0.0.1]) by usg-ed-osssrv.wdc.com (usg-ed-osssrv.wdc.com [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id mb14ioM0eeM6 for ; Fri, 25 Feb 2022 00:45:30 -0800 (PST) Received: from washi.fujisawa.hgst.com (washi.fujisawa.hgst.com [10.149.53.254]) by usg-ed-osssrv.wdc.com (Postfix) with ESMTPSA id 4K4jyx3dWYz1Rwrw; Fri, 25 Feb 2022 00:45:29 -0800 (PST) From: Damien Le Moal To: linux-scsi@vger.kernel.org, "Martin K . Petersen" Cc: Douglas Gilbert Subject: [PATCH 1/2] scsi: scsi_debug: silence sparse unexpected unlock warnings Date: Fri, 25 Feb 2022 17:45:26 +0900 Message-Id: <20220225084527.523038-2-damien.lemoal@opensource.wdc.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220225084527.523038-1-damien.lemoal@opensource.wdc.com> References: <20220225084527.523038-1-damien.lemoal@opensource.wdc.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org The return statement inside the sdeb_read_lock(), sdeb_read_unlock(), sdeb_write_lock() and sdeb_write_unlock() confuse sparse, leading to many warnings about unexpected unlocks in the resp_xxx() functions. Modify the lock/unlock functions using the __acquire() and __release() inline annotations for the sdebug_no_rwlock == true case to avoid these warnings. Signed-off-by: Damien Le Moal Acked-by: Douglas Gilbert --- drivers/scsi/scsi_debug.c | 68 +++++++++++++++++++++++++-------------- 1 file changed, 44 insertions(+), 24 deletions(-) diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index 0d25b30922ef..f4e97f2224b2 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -3167,45 +3167,65 @@ static int prot_verify_read(struct scsi_cmnd *scp, sector_t start_sec, static inline void sdeb_read_lock(struct sdeb_store_info *sip) { - if (sdebug_no_rwlock) - return; - if (sip) - read_lock(&sip->macc_lck); - else - read_lock(&sdeb_fake_rw_lck); + if (sdebug_no_rwlock) { + if (sip) + __acquire(&sip->macc_lck); + else + __acquire(&sdeb_fake_rw_lck); + } else { + if (sip) + read_lock(&sip->macc_lck); + else + read_lock(&sdeb_fake_rw_lck); + } } static inline void sdeb_read_unlock(struct sdeb_store_info *sip) { - if (sdebug_no_rwlock) - return; - if (sip) - read_unlock(&sip->macc_lck); - else - read_unlock(&sdeb_fake_rw_lck); + if (sdebug_no_rwlock) { + if (sip) + __release(&sip->macc_lck); + else + __release(&sdeb_fake_rw_lck); + } else { + if (sip) + read_unlock(&sip->macc_lck); + else + read_unlock(&sdeb_fake_rw_lck); + } } static inline void sdeb_write_lock(struct sdeb_store_info *sip) { - if (sdebug_no_rwlock) - return; - if (sip) - write_lock(&sip->macc_lck); - else - write_lock(&sdeb_fake_rw_lck); + if (sdebug_no_rwlock) { + if (sip) + __acquire(&sip->macc_lck); + else + __acquire(&sdeb_fake_rw_lck); + } else { + if (sip) + write_lock(&sip->macc_lck); + else + write_lock(&sdeb_fake_rw_lck); + } } static inline void sdeb_write_unlock(struct sdeb_store_info *sip) { - if (sdebug_no_rwlock) - return; - if (sip) - write_unlock(&sip->macc_lck); - else - write_unlock(&sdeb_fake_rw_lck); + if (sdebug_no_rwlock) { + if (sip) + __release(&sip->macc_lck); + else + __release(&sdeb_fake_rw_lck); + } else { + if (sip) + write_unlock(&sip->macc_lck); + else + write_unlock(&sdeb_fake_rw_lck); + } } static int resp_read_dt0(struct scsi_cmnd *scp, struct sdebug_dev_info *devip) From patchwork Fri Feb 25 08:45:27 2022 Content-Type: text/plain; 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Petersen" Cc: Douglas Gilbert Subject: [PATCH 2/2] scsi: scsi_debug: fix sparse lock warnings in sdebug_blk_mq_poll() Date: Fri, 25 Feb 2022 17:45:27 +0900 Message-Id: <20220225084527.523038-3-damien.lemoal@opensource.wdc.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220225084527.523038-1-damien.lemoal@opensource.wdc.com> References: <20220225084527.523038-1-damien.lemoal@opensource.wdc.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org The use of the locked boolean variable to control locking and unlocking of the qc_lock of struct sdebug_queue confuses sparse, leading to a warning about an unexpected unlock. Simplify the qc_lock lock/unlock handling code of this function to avoid this warning by removing the locked boolean variable. Signed-off-by: Damien Le Moal --- drivers/scsi/scsi_debug.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index f4e97f2224b2..acb32f3e38eb 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -7509,7 +7509,6 @@ static int sdebug_blk_mq_poll(struct Scsi_Host *shost, unsigned int queue_num) { bool first; bool retiring = false; - bool locked = false; int num_entries = 0; unsigned int qc_idx = 0; unsigned long iflags; @@ -7525,18 +7524,17 @@ static int sdebug_blk_mq_poll(struct Scsi_Host *shost, unsigned int queue_num) if (qc_idx >= sdebug_max_queue) return 0; + spin_lock_irqsave(&sqp->qc_lock, iflags); + for (first = true; first || qc_idx + 1 < sdebug_max_queue; ) { - if (!locked) { - spin_lock_irqsave(&sqp->qc_lock, iflags); - locked = true; - } if (first) { first = false; if (!test_bit(qc_idx, sqp->in_use_bm)) continue; - } else { - qc_idx = find_next_bit(sqp->in_use_bm, sdebug_max_queue, qc_idx + 1); } + + qc_idx = find_next_bit(sqp->in_use_bm, sdebug_max_queue, + qc_idx + 1); if (qc_idx >= sdebug_max_queue) break; @@ -7586,14 +7584,15 @@ static int sdebug_blk_mq_poll(struct Scsi_Host *shost, unsigned int queue_num) } WRITE_ONCE(sd_dp->defer_t, SDEB_DEFER_NONE); spin_unlock_irqrestore(&sqp->qc_lock, iflags); - locked = false; scsi_done(scp); /* callback to mid level */ num_entries++; + spin_lock_irqsave(&sqp->qc_lock, iflags); if (find_first_bit(sqp->in_use_bm, sdebug_max_queue) >= sdebug_max_queue) break; /* if no more then exit without retaking spinlock */ } - if (locked) - spin_unlock_irqrestore(&sqp->qc_lock, iflags); + + spin_unlock_irqrestore(&sqp->qc_lock, iflags); + if (num_entries > 0) atomic_add(num_entries, &sdeb_mq_poll_count); return num_entries;