From mboxrd@z Thu Jan 1 00:00:00 1970 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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 1AA48C11F73 for ; Sat, 10 Jul 2021 02:33:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 04CF7613C5 for ; Sat, 10 Jul 2021 02:33:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235152AbhGJCf6 (ORCPT ); Fri, 9 Jul 2021 22:35:58 -0400 Received: from mail.kernel.org ([198.145.29.99]:53552 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235699AbhGJCe7 (ORCPT ); Fri, 9 Jul 2021 22:34:59 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id E06E6613DF; Sat, 10 Jul 2021 02:32:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625884334; bh=PvYicS1MzkHzIS9KQy8XMlGrWB35iLyEPJpc6q/fTNE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S/wen5Xz8UU9bJYNHtHzRRPrL96Ov9X+IppftqWnuTcjVZ9bSE9bs3rxlS+im3+Fi 6p9u7gOdD+UsZbP37mgZiM8AbJ9gQ5TvQGe63aQi2+6BXkoEBNs+IszgZnR+3w9FAh BGqZNz581dBK/C0hc/Ikmu7b5kwL0En7+VQes20Yhu+kLGpwkhUOxLZplptHzO1Hrp za9XctHprQG2jMctN3XEnCAU+ZTbfPmsvZUmMpxiqvEL00lYgZeghg4Pd7DoGg1FVe x2rdxRDMi1fzHf5DRzYkvMIVW1E87o1X3g0FFQW48036iI+oCvDGoIW6ezdblUuubD 4eDX8YfbysTWg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: John Garry , Ming Lei , Bart Van Assche , "Martin K . Petersen" , Sasha Levin , linux-scsi@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 08/39] scsi: core: Cap scsi_host cmd_per_lun at can_queue Date: Fri, 9 Jul 2021 22:31:33 -0400 Message-Id: <20210710023204.3171428-8-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210710023204.3171428-1-sashal@kernel.org> References: <20210710023204.3171428-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: John Garry [ Upstream commit ea2f0f77538c50739b9fb4de4700cee5535e1f77 ] The sysfs handling function sdev_store_queue_depth() enforces that the sdev queue depth cannot exceed shost can_queue. The initial sdev queue depth comes from shost cmd_per_lun. However, the LLDD may manually set cmd_per_lun to be larger than can_queue, which leads to an initial sdev queue depth greater than can_queue. Such an issue was reported in [0], which caused a hang. That has since been fixed in commit fc09acb7de31 ("scsi: scsi_debug: Fix cmd_per_lun, set to max_queue"). Stop this possibly happening for other drivers by capping shost cmd_per_lun at shost can_queue. [0] https://lore.kernel.org/linux-scsi/YHaez6iN2HHYxYOh@T590/ Link: https://lore.kernel.org/r/1621434662-173079-1-git-send-email-john.garry@huawei.com Reviewed-by: Ming Lei Reviewed-by: Bart Van Assche Signed-off-by: John Garry Signed-off-by: Martin K. Petersen Signed-off-by: Sasha Levin --- drivers/scsi/hosts.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c index fa03be813f2c..9462564b2147 100644 --- a/drivers/scsi/hosts.c +++ b/drivers/scsi/hosts.c @@ -218,6 +218,9 @@ int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev, goto fail; } + shost->cmd_per_lun = min_t(short, shost->cmd_per_lun, + shost->can_queue); + error = scsi_init_sense_cache(shost); if (error) goto fail; -- 2.30.2