linux-kernel - [PATCH 4.14 67/89] scsi: libsas: Disable asynchronous aborts for SATA devices

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Date:   Mon, 22 Jan 2018 09:45:47 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hannes Reinecke <hare@...e.com>,
        Christoph Hellwig <hch@....de>,
        Yves-Alexis Perez <corsac@...ian.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.14 67/89] scsi: libsas: Disable asynchronous aborts for SATA devices

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hannes Reinecke <hare@...e.de>

commit c9f926000fe3b84135a81602a9f7e63a6a7898e2 upstream.

Handling CD-ROM devices from libsas is decidedly odd, as libata relies
on SCSI EH to be started to figure out that no medium is present.  So we
cannot do asynchronous aborts for SATA devices.

Fixes: 909657615d9 ("scsi: libsas: allow async aborts")
Signed-off-by: Hannes Reinecke <hare@...e.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Tested-by: Yves-Alexis Perez <corsac@...ian.org>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/libsas/sas_scsi_host.c |   17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -486,15 +486,28 @@ static int sas_queue_reset(struct domain
 
 int sas_eh_abort_handler(struct scsi_cmnd *cmd)
 {
-	int res;
+	int res = TMF_RESP_FUNC_FAILED;
 	struct sas_task *task = TO_SAS_TASK(cmd);
 	struct Scsi_Host *host = cmd->device->host;
+	struct domain_device *dev = cmd_to_domain_dev(cmd);
 	struct sas_internal *i = to_sas_internal(host->transportt);
+	unsigned long flags;
 
 	if (!i->dft->lldd_abort_task)
 		return FAILED;
 
-	res = i->dft->lldd_abort_task(task);
+	spin_lock_irqsave(host->host_lock, flags);
+	/* We cannot do async aborts for SATA devices */
+	if (dev_is_sata(dev) && !host->host_eh_scheduled) {
+		spin_unlock_irqrestore(host->host_lock, flags);
+		return FAILED;
+	}
+	spin_unlock_irqrestore(host->host_lock, flags);
+
+	if (task)
+		res = i->dft->lldd_abort_task(task);
+	else
+		SAS_DPRINTK("no task to abort\n");
 	if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 		return SUCCESS;