From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bart Van Assche Subject: [PATCH 1/3] Remove two cancel_delayed_work() calls from the error handler Date: Mon, 26 May 2014 17:14:26 +0200 Message-ID: <53835A52.9010306@acm.org> References: <538359DB.9080601@acm.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Received: from albert.telenet-ops.be ([195.130.137.90]:46934 "EHLO albert.telenet-ops.be" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751549AbaEZPO1 (ORCPT ); Mon, 26 May 2014 11:14:27 -0400 In-Reply-To: <538359DB.9080601@acm.org> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: James Bottomley , Christoph Hellwig Cc: Hannes Reinecke , Jens Axboe , Paolo Bonzini , Joe Lawrence , "linux-scsi@vger.kernel.org" scsi_put_command() is either invoked before a command is queued or after a command has completed. scsi_cmnd.abort_work is scheduled after a command has timed out and before it is finished. The block layer guarantees that either the softirq_done_fn() or the rq_timed_out_fn() function is invoked but not both. This means that scsi_put_command() is never invoked while abort_work is scheduled. Hence remove the cancel_delayed_work() call from scsi_put_command(). Similarly, scsi_abort_command() is only invoked from the SCSI timeout handler. If scsi_abort_command() is invoked for a SCSI command with the SCSI_EH_ABORT_SCHEDULED flag set this means that scmd_eh_abort_handler() has already invoked scsi_queue_insert() and hence that scsi_cmnd.abort_work is no longer pending. Hence also remove the cancel_delayed_work() call from scsi_abort_command(). Signed-off-by: Bart Van Assche Cc: Hannes Reinecke Cc: Paolo Bonzini Cc: Christoph Hellwig Cc: Jens Axboe Cc: Joe Lawrence --- drivers/scsi/scsi.c | 2 +- drivers/scsi/scsi_error.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 88d46fe..c972eab 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -334,7 +334,7 @@ void scsi_put_command(struct scsi_cmnd *cmd) list_del_init(&cmd->list); spin_unlock_irqrestore(&cmd->device->list_lock, flags); - cancel_delayed_work(&cmd->abort_work); + WARN_ON_ONCE(delayed_work_pending(&cmd->abort_work)); __scsi_put_command(cmd->device->host, cmd); } diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index f17aa7a..5232583 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -193,7 +193,7 @@ scsi_abort_command(struct scsi_cmnd *scmd) SCSI_LOG_ERROR_RECOVERY(3, scmd_printk(KERN_INFO, scmd, "scmd %p previous abort failed\n", scmd)); - cancel_delayed_work(&scmd->abort_work); + WARN_ON_ONCE(delayed_work_pending(&scmd->abort_work)); return FAILED; } -- 1.8.4.5