scsi: ipr: Error path locking fixes
This patch closes up some potential race conditions observed in the
error handling paths in ipr while debugging an issue resulting in a hang
with SATA error handling. These patches ensure we are holding the
correct lock when adding and removing commands from the free and pending
queues in some error scenarios.
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Reviewed-by: Wendy Xiong <wenxiong@linux.vnet.ibm.com>
Tested-by: Wendy Xiong <wenxiong@linux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 19162d7..95f1e64 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -820,6 +820,29 @@ static int ipr_set_pcix_cmd_reg(struct ipr_ioa_cfg *ioa_cfg)
}
/**
+ * __ipr_sata_eh_done - done function for aborted SATA commands
+ * @ipr_cmd: ipr command struct
+ *
+ * This function is invoked for ops generated to SATA
+ * devices which are being aborted.
+ *
+ * Return value:
+ * none
+ **/
+static void __ipr_sata_eh_done(struct ipr_cmnd *ipr_cmd)
+{
+ struct ata_queued_cmd *qc = ipr_cmd->qc;
+ struct ipr_sata_port *sata_port = qc->ap->private_data;
+
+ qc->err_mask |= AC_ERR_OTHER;
+ sata_port->ioasa.status |= ATA_BUSY;
+ ata_qc_complete(qc);
+ if (ipr_cmd->eh_comp)
+ complete(ipr_cmd->eh_comp);
+ list_add_tail(&ipr_cmd->queue, &ipr_cmd->hrrq->hrrq_free_q);
+}
+
+/**
* ipr_sata_eh_done - done function for aborted SATA commands
* @ipr_cmd: ipr command struct
*
@@ -831,12 +854,32 @@ static int ipr_set_pcix_cmd_reg(struct ipr_ioa_cfg *ioa_cfg)
**/
static void ipr_sata_eh_done(struct ipr_cmnd *ipr_cmd)
{
- struct ata_queued_cmd *qc = ipr_cmd->qc;
- struct ipr_sata_port *sata_port = qc->ap->private_data;
+ struct ipr_hrr_queue *hrrq = ipr_cmd->hrrq;
+ unsigned long hrrq_flags;
- qc->err_mask |= AC_ERR_OTHER;
- sata_port->ioasa.status |= ATA_BUSY;
- ata_qc_complete(qc);
+ spin_lock_irqsave(&hrrq->_lock, hrrq_flags);
+ __ipr_sata_eh_done(ipr_cmd);
+ spin_unlock_irqrestore(&hrrq->_lock, hrrq_flags);
+}
+
+/**
+ * __ipr_scsi_eh_done - mid-layer done function for aborted ops
+ * @ipr_cmd: ipr command struct
+ *
+ * This function is invoked by the interrupt handler for
+ * ops generated by the SCSI mid-layer which are being aborted.
+ *
+ * Return value:
+ * none
+ **/
+static void __ipr_scsi_eh_done(struct ipr_cmnd *ipr_cmd)
+{
+ struct scsi_cmnd *scsi_cmd = ipr_cmd->scsi_cmd;
+
+ scsi_cmd->result |= (DID_ERROR << 16);
+
+ scsi_dma_unmap(ipr_cmd->scsi_cmd);
+ scsi_cmd->scsi_done(scsi_cmd);
if (ipr_cmd->eh_comp)
complete(ipr_cmd->eh_comp);
list_add_tail(&ipr_cmd->queue, &ipr_cmd->hrrq->hrrq_free_q);
@@ -854,15 +897,12 @@ static void ipr_sata_eh_done(struct ipr_cmnd *ipr_cmd)
**/
static void ipr_scsi_eh_done(struct ipr_cmnd *ipr_cmd)
{
- struct scsi_cmnd *scsi_cmd = ipr_cmd->scsi_cmd;
+ unsigned long hrrq_flags;
+ struct ipr_hrr_queue *hrrq = ipr_cmd->hrrq;
- scsi_cmd->result |= (DID_ERROR << 16);
-
- scsi_dma_unmap(ipr_cmd->scsi_cmd);
- scsi_cmd->scsi_done(scsi_cmd);
- if (ipr_cmd->eh_comp)
- complete(ipr_cmd->eh_comp);
- list_add_tail(&ipr_cmd->queue, &ipr_cmd->hrrq->hrrq_free_q);
+ spin_lock_irqsave(&hrrq->_lock, hrrq_flags);
+ __ipr_scsi_eh_done(ipr_cmd);
+ spin_unlock_irqrestore(&hrrq->_lock, hrrq_flags);
}
/**
@@ -892,9 +932,9 @@ static void ipr_fail_all_ops(struct ipr_ioa_cfg *ioa_cfg)
cpu_to_be32(IPR_DRIVER_ILID);
if (ipr_cmd->scsi_cmd)
- ipr_cmd->done = ipr_scsi_eh_done;
+ ipr_cmd->done = __ipr_scsi_eh_done;
else if (ipr_cmd->qc)
- ipr_cmd->done = ipr_sata_eh_done;
+ ipr_cmd->done = __ipr_sata_eh_done;
ipr_trc_hook(ipr_cmd, IPR_TRACE_FINISH,
IPR_IOASC_IOA_WAS_RESET);
@@ -5948,7 +5988,7 @@ static int ipr_build_ioadl(struct ipr_ioa_cfg *ioa_cfg,
}
/**
- * ipr_erp_done - Process completion of ERP for a device
+ * __ipr_erp_done - Process completion of ERP for a device
* @ipr_cmd: ipr command struct
*
* This function copies the sense buffer into the scsi_cmd
@@ -5957,7 +5997,7 @@ static int ipr_build_ioadl(struct ipr_ioa_cfg *ioa_cfg,
* Return value:
* nothing
**/
-static void ipr_erp_done(struct ipr_cmnd *ipr_cmd)
+static void __ipr_erp_done(struct ipr_cmnd *ipr_cmd)
{
struct scsi_cmnd *scsi_cmd = ipr_cmd->scsi_cmd;
struct ipr_resource_entry *res = scsi_cmd->device->hostdata;
@@ -5985,6 +6025,26 @@ static void ipr_erp_done(struct ipr_cmnd *ipr_cmd)
}
/**
+ * ipr_erp_done - Process completion of ERP for a device
+ * @ipr_cmd: ipr command struct
+ *
+ * This function copies the sense buffer into the scsi_cmd
+ * struct and pushes the scsi_done function.
+ *
+ * Return value:
+ * nothing
+ **/
+static void ipr_erp_done(struct ipr_cmnd *ipr_cmd)
+{
+ struct ipr_hrr_queue *hrrq = ipr_cmd->hrrq;
+ unsigned long hrrq_flags;
+
+ spin_lock_irqsave(&hrrq->_lock, hrrq_flags);
+ __ipr_erp_done(ipr_cmd);
+ spin_unlock_irqrestore(&hrrq->_lock, hrrq_flags);
+}
+
+/**
* ipr_reinit_ipr_cmnd_for_erp - Re-initialize a cmnd block to be used for ERP
* @ipr_cmd: ipr command struct
*
@@ -6016,7 +6076,7 @@ static void ipr_reinit_ipr_cmnd_for_erp(struct ipr_cmnd *ipr_cmd)
}
/**
- * ipr_erp_request_sense - Send request sense to a device
+ * __ipr_erp_request_sense - Send request sense to a device
* @ipr_cmd: ipr command struct
*
* This function sends a request sense to a device as a result
@@ -6025,13 +6085,13 @@ static void ipr_reinit_ipr_cmnd_for_erp(struct ipr_cmnd *ipr_cmd)
* Return value:
* nothing
**/
-static void ipr_erp_request_sense(struct ipr_cmnd *ipr_cmd)
+static void __ipr_erp_request_sense(struct ipr_cmnd *ipr_cmd)
{
struct ipr_cmd_pkt *cmd_pkt = &ipr_cmd->ioarcb.cmd_pkt;
u32 ioasc = be32_to_cpu(ipr_cmd->s.ioasa.hdr.ioasc);
if (IPR_IOASC_SENSE_KEY(ioasc) > 0) {
- ipr_erp_done(ipr_cmd);
+ __ipr_erp_done(ipr_cmd);
return;
}
@@ -6052,6 +6112,26 @@ static void ipr_erp_request_sense(struct ipr_cmnd *ipr_cmd)
}
/**
+ * ipr_erp_request_sense - Send request sense to a device
+ * @ipr_cmd: ipr command struct
+ *
+ * This function sends a request sense to a device as a result
+ * of a check condition.
+ *
+ * Return value:
+ * nothing
+ **/
+static void ipr_erp_request_sense(struct ipr_cmnd *ipr_cmd)
+{
+ struct ipr_hrr_queue *hrrq = ipr_cmd->hrrq;
+ unsigned long hrrq_flags;
+
+ spin_lock_irqsave(&hrrq->_lock, hrrq_flags);
+ __ipr_erp_request_sense(ipr_cmd);
+ spin_unlock_irqrestore(&hrrq->_lock, hrrq_flags);
+}
+
+/**
* ipr_erp_cancel_all - Send cancel all to a device
* @ipr_cmd: ipr command struct
*
@@ -6074,7 +6154,7 @@ static void ipr_erp_cancel_all(struct ipr_cmnd *ipr_cmd)
ipr_reinit_ipr_cmnd_for_erp(ipr_cmd);
if (!scsi_cmd->device->simple_tags) {
- ipr_erp_request_sense(ipr_cmd);
+ __ipr_erp_request_sense(ipr_cmd);
return;
}
@@ -6294,7 +6374,7 @@ static void ipr_erp_start(struct ipr_ioa_cfg *ioa_cfg,
u32 masked_ioasc = ioasc & IPR_IOASC_IOASC_MASK;
if (!res) {
- ipr_scsi_eh_done(ipr_cmd);
+ __ipr_scsi_eh_done(ipr_cmd);
return;
}
