From: Mark Salyzyn Date: Thu, 22 Sep 2011 15:50:01 +0000 (-0700) Subject: [SCSI] pm8001: fix DEV_IS_GONE infinite retry X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b90b378ad5767c0743113c675b09ac00fa534c33;p=linux-beck.git [SCSI] pm8001: fix DEV_IS_GONE infinite retry On the pm8001, when a device is in the process of going away (device power off or hot plug), depending on the timing, the driver would return SAS_PHY_DOWN as the return value to the queuecommand DEV_IS_GONE logic. The net result is an near infinite retry (especially if SAS debugging is enabled), the logs will fill with: kernel: mpi_ssp_completion 2119:e21:SSP IO status 0x13 tag 0xcc1c0000 dlen=90 param=0xe kernel: wwn=5000c50034069e86 cdb=12 00 00 00 5a 00 00 00 00 00 00 00 00 00 00 00 kernel: sas: lldd_execute_task returned: 138 kernel: sas: lldd_execute_task returned: 138 kernel: sas: lldd_execute_task returned: 138 kernel: sas: lldd_execute_task returned: 138 kernel: sas: lldd_execute_task returned: 138 kernel: sas: lldd_execute_task returned: 138 kernel: sas: lldd_execute_task returned: 138 . . . This patch changes to leverage the port_attached logic to complete the command with a status of PHY_DOWN so that the disposition can be handled immediately and correctly. Signed-off-by: Mark Salyzyn Acked-by: Jack Wang Signed-off-by: James Bottomley --- diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c index 9068f123eccf..dfda00d43326 100644 --- a/drivers/scsi/pm8001/pm8001_sas.c +++ b/drivers/scsi/pm8001/pm8001_sas.c @@ -356,21 +356,8 @@ static int pm8001_task_exec(struct sas_task *task, const int num, do { dev = t->dev; pm8001_dev = dev->lldd_dev; - if (DEV_IS_GONE(pm8001_dev)) { - if (pm8001_dev) { - PM8001_IO_DBG(pm8001_ha, - pm8001_printk("device %d not ready.\n", - pm8001_dev->device_id)); - } else { - PM8001_IO_DBG(pm8001_ha, - pm8001_printk("device %016llx not " - "ready.\n", SAS_ADDR(dev->sas_addr))); - } - rc = SAS_PHY_DOWN; - goto out_done; - } port = &pm8001_ha->port[sas_find_local_port_id(dev)]; - if (!port->port_attached) { + if (DEV_IS_GONE(pm8001_dev) || !port->port_attached) { if (sas_protocol_ata(t->task_proto)) { struct task_status_struct *ts = &t->task_status; ts->resp = SAS_TASK_UNDELIVERED;