[PATCH] move ->eh_strategy_handler to the transport class

Overriding the whole EH code is a per-transport, not per-host thing.
Move ->eh_strategy_handler to the transport class, same as
->eh_timed_out.

Downside is that scsi_host_alloc can't check for the total lack of EH
anymore, but the transition period from old EH where we needed it is
long gone already.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

26 files changed, 18 insertions, 66 deletions

diff --git a/Documentation/DocBook/libata.tmpl b/Documentation/DocBook/libata.tmpl
index 5bcbb6ee3bc..f869b03929d 100644
--- a/Documentation/DocBook/libata.tmpl
+++ b/Documentation/DocBook/libata.tmpl
@@ -705,7 +705,7 @@ and other resources, etc.
 
 	<sect1><title>ata_scsi_error()</title>
 	<para>
-	ata_scsi_error() is the current hostt->eh_strategy_handler()
+	ata_scsi_error() is the current transportt->eh_strategy_handler()
 	for libata.  As discussed above, this will be entered in two
 	cases - timeout and ATAPI error completion.  This function
 	calls low level libata driver's eng_timeout() callback, the
diff --git a/Documentation/scsi/scsi_eh.txt b/Documentation/scsi/scsi_eh.txt
index 331afd791cb..ce767b90bb0 100644
--- a/Documentation/scsi/scsi_eh.txt
+++ b/Documentation/scsi/scsi_eh.txt
@@ -19,9 +19,9 @@ TABLE OF CONTENTS
 	[2-1-1] Overview
 	[2-1-2] Flow of scmds through EH
 	[2-1-3] Flow of control
-    [2-2] EH through hostt->eh_strategy_handler()
-	[2-2-1] Pre hostt->eh_strategy_handler() SCSI midlayer conditions
-	[2-2-2] Post hostt->eh_strategy_handler() SCSI midlayer conditions
+    [2-2] EH through transportt->eh_strategy_handler()
+	[2-2-1] Pre transportt->eh_strategy_handler() SCSI midlayer conditions
+	[2-2-2] Post transportt->eh_strategy_handler() SCSI midlayer conditions
 	[2-2-3] Things to consider
 
 
@@ -413,9 +413,9 @@ scmd->allowed.
 	    layer of failure of the scmds.
 
 
-[2-2] EH through hostt->eh_strategy_handler()
+[2-2] EH through transportt->eh_strategy_handler()
 
- hostt->eh_strategy_handler() is invoked in the place of
+ transportt->eh_strategy_handler() is invoked in the place of
 scsi_unjam_host() and it is responsible for whole recovery process.
 On completion, the handler should have made lower layers forget about
 all failed scmds and either ready for new commands or offline.  Also,
@@ -424,7 +424,7 @@ SCSI midlayer.  IOW, of the steps described in [2-1-2], all steps
 except for #1 must be implemented by eh_strategy_handler().
 
 
-[2-2-1] Pre hostt->eh_strategy_handler() SCSI midlayer conditions
+[2-2-1] Pre transportt->eh_strategy_handler() SCSI midlayer conditions
 
  The following conditions are true on entry to the handler.
 
@@ -437,7 +437,7 @@ except for #1 must be implemented by eh_strategy_handler().
  - shost->host_failed == shost->host_busy
 
 
-[2-2-2] Post hostt->eh_strategy_handler() SCSI midlayer conditions
+[2-2-2] Post transportt->eh_strategy_handler() SCSI midlayer conditions
 
  The following conditions must be true on exit from the handler.
 
diff --git a/Documentation/scsi/scsi_mid_low_api.txt b/Documentation/scsi/scsi_mid_low_api.txt
index 8bbae3e1abd..75a535a975c 100644
--- a/Documentation/scsi/scsi_mid_low_api.txt
+++ b/Documentation/scsi/scsi_mid_low_api.txt
@@ -804,7 +804,6 @@ Summary:
    eh_bus_reset_handler - issue SCSI bus reset
    eh_device_reset_handler - issue SCSI device reset
    eh_host_reset_handler - reset host (host bus adapter)
-   eh_strategy_handler - driver supplied alternate to scsi_unjam_host()
    info - supply information about given host
    ioctl - driver can respond to ioctls
    proc_info - supports /proc/scsi/{driver_name}/{host_no}
@@ -970,24 +969,6 @@ Details:
 
 
 /**
- *      eh_strategy_handler - driver supplied alternate to scsi_unjam_host()
- *      @shp: host on which error has occurred
- *
- *      Returns TRUE if host unjammed, else FALSE.
- *
- *      Locks: none
- *
- *      Calling context: kernel thread
- *
- *      Notes: Invoked from scsi_eh thread. LLD supplied alternate to 
- *      scsi_unjam_host() found in scsi_error.c
- *
- *      Optionally defined in: LLD
- **/
-     int eh_strategy_handler(struct Scsi_Host * shp)
-
-
-/**
  *      info - supply information about given host: driver name plus data
  *             to distinguish given host
  *      @shp: host to supply information about
diff --git a/drivers/scsi/ahci.c b/drivers/scsi/ahci.c
index 1bd82c4e52a..b4f8fb1d628 100644
--- a/drivers/scsi/ahci.c
+++ b/drivers/scsi/ahci.c
@@ -207,7 +207,6 @@ static struct scsi_host_template ahci_sht = {
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
-	.eh_strategy_handler	= ata_scsi_error,
 	.can_queue		= ATA_DEF_QUEUE,
 	.this_id		= ATA_SHT_THIS_ID,
 	.sg_tablesize		= AHCI_MAX_SG,
diff --git a/drivers/scsi/ata_piix.c b/drivers/scsi/ata_piix.c
index 24e71b55517..6dc88149f9f 100644
--- a/drivers/scsi/ata_piix.c
+++ b/drivers/scsi/ata_piix.c
@@ -209,7 +209,6 @@ static struct scsi_host_template piix_sht = {
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
-	.eh_strategy_handler	= ata_scsi_error,
 	.can_queue		= ATA_DEF_QUEUE,
 	.this_id		= ATA_SHT_THIS_ID,
 	.sg_tablesize		= LIBATA_MAX_PRD,
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index ef57f253031..dfcb96f3e60 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -294,18 +294,6 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
 	if (sht->unchecked_isa_dma && privsize)
 		gfp_mask |= __GFP_DMA;
 
-        /* Check to see if this host has any error handling facilities */
-        if (!sht->eh_strategy_handler && !sht->eh_abort_handler &&
-	    !sht->eh_device_reset_handler && !sht->eh_bus_reset_handler &&
-            !sht->eh_host_reset_handler) {
-		printk(KERN_ERR "ERROR: SCSI host `%s' has no error handling\n"
-				"ERROR: This is not a safe way to run your "
-				        "SCSI host\n"
-				"ERROR: The error handling must be added to "
-				"this driver\n", sht->proc_name);
-		dump_stack();
-        }
-
 	shost = kzalloc(sizeof(struct Scsi_Host) + privsize, gfp_mask);
 	if (!shost)
 		return NULL;
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index e63c1ff1e10..bd147207f25 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -4938,7 +4938,6 @@ EXPORT_SYMBOL_GPL(ata_busy_sleep);
 EXPORT_SYMBOL_GPL(ata_port_queue_task);
 EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
 EXPORT_SYMBOL_GPL(ata_scsi_queuecmd);
-EXPORT_SYMBOL_GPL(ata_scsi_error);
 EXPORT_SYMBOL_GPL(ata_scsi_slave_config);
 EXPORT_SYMBOL_GPL(ata_scsi_release);
 EXPORT_SYMBOL_GPL(ata_host_intr);
diff --git a/drivers/scsi/libata-scsi.c b/drivers/scsi/libata-scsi.c
index 53f5b0d9161..a0289ec3e28 100644
--- a/drivers/scsi/libata-scsi.c
+++ b/drivers/scsi/libata-scsi.c
@@ -53,6 +53,7 @@
 typedef unsigned int (*ata_xlat_func_t)(struct ata_queued_cmd *qc, const u8 *scsicmd);
 static struct ata_device *
 ata_scsi_find_dev(struct ata_port *ap, const struct scsi_device *scsidev);
+static void ata_scsi_error(struct Scsi_Host *host);
 enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd);
 
 #define RW_RECOVERY_MPAGE 0x1
@@ -99,6 +100,7 @@ static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
  * It just needs the eh_timed_out hook.
  */
 struct scsi_transport_template ata_scsi_transport_template = {
+	.eh_strategy_handler	= ata_scsi_error,
 	.eh_timed_out		= ata_scsi_timed_out,
 };
 
@@ -772,12 +774,9 @@ enum scsi_eh_timer_return ata_scsi_timed_out(struct scsi_cmnd *cmd)
  *
  *	LOCKING:
  *	Inherited from SCSI layer (none, can sleep)
- *
- *	RETURNS:
- *	Zero.
  */
 
-int ata_scsi_error(struct Scsi_Host *host)
+static void ata_scsi_error(struct Scsi_Host *host)
 {
 	struct ata_port *ap;
 	unsigned long flags;
@@ -805,7 +804,6 @@ int ata_scsi_error(struct Scsi_Host *host)
 	spin_unlock_irqrestore(&ap->host_set->lock, flags);
 
 	DPRINTK("EXIT\n");
-	return 0;
 }
 
 static void ata_eh_scsidone(struct scsi_cmnd *scmd)
diff --git a/drivers/scsi/libata.h b/drivers/scsi/libata.h
index 1c755b14521..bac8cbae06f 100644
--- a/drivers/scsi/libata.h
+++ b/drivers/scsi/libata.h
@@ -60,7 +60,6 @@ extern int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg);
 extern struct scsi_transport_template ata_scsi_transport_template;
 
 extern void ata_scsi_scan_host(struct ata_port *ap);
-extern int ata_scsi_error(struct Scsi_Host *host);
 extern unsigned int ata_scsiop_inq_std(struct ata_scsi_args *args, u8 *rbuf,
 			       unsigned int buflen);
 
diff --git a/drivers/scsi/pdc_adma.c b/drivers/scsi/pdc_adma.c
index 3c85c4b66e1..5cda16cfacb 100644
--- a/drivers/scsi/pdc_adma.c
+++ b/drivers/scsi/pdc_adma.c
@@ -143,7 +143,6 @@ static struct scsi_host_template adma_ata_sht = {
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
-	.eh_strategy_handler	= ata_scsi_error,
 	.can_queue		= ATA_DEF_QUEUE,
 	.this_id		= ATA_SHT_THIS_ID,
 	.sg_tablesize		= LIBATA_MAX_PRD,
diff --git a/drivers/scsi/sata_mv.c b/drivers/scsi/sata_mv.c
index fa901fd6508..0ebf13668f5 100644
--- a/drivers/scsi/sata_mv.c
+++ b/drivers/scsi/sata_mv.c
@@ -378,8 +378,6 @@ static struct scsi_host_template mv_sht = {
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
-	.eh_strategy_handler	= ata_scsi_error,
-	.can_queue		= MV_USE_Q_DEPTH,
 	.this_id		= ATA_SHT_THIS_ID,
 	.sg_tablesize		= MV_MAX_SG_CT / 2,
 	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
diff --git a/drivers/scsi/sata_nv.c b/drivers/scsi/sata_nv.c
index f77bf183dfa..9f553081b5e 100644
--- a/drivers/scsi/sata_nv.c
+++ b/drivers/scsi/sata_nv.c
@@ -201,7 +201,6 @@ static struct scsi_host_template nv_sht = {
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
-	.eh_strategy_handler	= ata_scsi_error,
 	.can_queue		= ATA_DEF_QUEUE,
 	.this_id		= ATA_SHT_THIS_ID,
 	.sg_tablesize		= LIBATA_MAX_PRD,
diff --git a/drivers/scsi/sata_promise.c b/drivers/scsi/sata_promise.c
index cc928c68a47..7eb67a6bdc6 100644
--- a/drivers/scsi/sata_promise.c
+++ b/drivers/scsi/sata_promise.c
@@ -111,7 +111,6 @@ static struct scsi_host_template pdc_ata_sht = {
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
-	.eh_strategy_handler	= ata_scsi_error,
 	.can_queue		= ATA_DEF_QUEUE,
 	.this_id		= ATA_SHT_THIS_ID,
 	.sg_tablesize		= LIBATA_MAX_PRD,
diff --git a/drivers/scsi/sata_qstor.c b/drivers/scsi/sata_qstor.c
index 9ffe1ef0d20..886f3447dd4 100644
--- a/drivers/scsi/sata_qstor.c
+++ b/drivers/scsi/sata_qstor.c
@@ -132,7 +132,6 @@ static struct scsi_host_template qs_ata_sht = {
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
-	.eh_strategy_handler	= ata_scsi_error,
 	.can_queue		= ATA_DEF_QUEUE,
 	.this_id		= ATA_SHT_THIS_ID,
 	.sg_tablesize		= QS_MAX_PRD,
diff --git a/drivers/scsi/sata_sil.c b/drivers/scsi/sata_sil.c
index 18c296c5689..106627299d5 100644
--- a/drivers/scsi/sata_sil.c
+++ b/drivers/scsi/sata_sil.c
@@ -146,7 +146,6 @@ static struct scsi_host_template sil_sht = {
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
-	.eh_strategy_handler	= ata_scsi_error,
 	.can_queue		= ATA_DEF_QUEUE,
 	.this_id		= ATA_SHT_THIS_ID,
 	.sg_tablesize		= LIBATA_MAX_PRD,
diff --git a/drivers/scsi/sata_sil24.c b/drivers/scsi/sata_sil24.c
index 068c98a4111..f7264fd611c 100644
--- a/drivers/scsi/sata_sil24.c
+++ b/drivers/scsi/sata_sil24.c
@@ -281,7 +281,6 @@ static struct scsi_host_template sil24_sht = {
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
-	.eh_strategy_handler	= ata_scsi_error,
 	.can_queue		= ATA_DEF_QUEUE,
 	.this_id		= ATA_SHT_THIS_ID,
 	.sg_tablesize		= LIBATA_MAX_PRD,
diff --git a/drivers/scsi/sata_sis.c b/drivers/scsi/sata_sis.c
index acc8439dea2..728530df2e0 100644
--- a/drivers/scsi/sata_sis.c
+++ b/drivers/scsi/sata_sis.c
@@ -87,7 +87,6 @@ static struct scsi_host_template sis_sht = {
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
-	.eh_strategy_handler	= ata_scsi_error,
 	.can_queue		= ATA_DEF_QUEUE,
 	.this_id		= ATA_SHT_THIS_ID,
 	.sg_tablesize		= ATA_MAX_PRD,
diff --git a/drivers/scsi/sata_svw.c b/drivers/scsi/sata_svw.c
index 724f0ed6a52..53b0d5c0a61 100644
--- a/drivers/scsi/sata_svw.c
+++ b/drivers/scsi/sata_svw.c
@@ -290,7 +290,6 @@ static struct scsi_host_template k2_sata_sht = {
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
-	.eh_strategy_handler	= ata_scsi_error,
 	.can_queue		= ATA_DEF_QUEUE,
 	.this_id		= ATA_SHT_THIS_ID,
 	.sg_tablesize		= LIBATA_MAX_PRD,
diff --git a/drivers/scsi/sata_sx4.c b/drivers/scsi/sata_sx4.c
index ae70f60c7c0..4139ad4b1df 100644
--- a/drivers/scsi/sata_sx4.c
+++ b/drivers/scsi/sata_sx4.c
@@ -182,7 +182,6 @@ static struct scsi_host_template pdc_sata_sht = {
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
-	.eh_strategy_handler	= ata_scsi_error,
 	.can_queue		= ATA_DEF_QUEUE,
 	.this_id		= ATA_SHT_THIS_ID,
 	.sg_tablesize		= LIBATA_MAX_PRD,
diff --git a/drivers/scsi/sata_uli.c b/drivers/scsi/sata_uli.c
index 7ac5a5f5a90..38b52bd3fa3 100644
--- a/drivers/scsi/sata_uli.c
+++ b/drivers/scsi/sata_uli.c
@@ -81,7 +81,6 @@ static struct scsi_host_template uli_sht = {
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
-	.eh_strategy_handler	= ata_scsi_error,
 	.can_queue		= ATA_DEF_QUEUE,
 	.this_id		= ATA_SHT_THIS_ID,
 	.sg_tablesize		= LIBATA_MAX_PRD,
diff --git a/drivers/scsi/sata_via.c b/drivers/scsi/sata_via.c
index 791bf652ba6..9e7ae4e0db3 100644
--- a/drivers/scsi/sata_via.c
+++ b/drivers/scsi/sata_via.c
@@ -94,7 +94,6 @@ static struct scsi_host_template svia_sht = {
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
-	.eh_strategy_handler	= ata_scsi_error,
 	.can_queue		= ATA_DEF_QUEUE,
 	.this_id		= ATA_SHT_THIS_ID,
 	.sg_tablesize		= LIBATA_MAX_PRD,
diff --git a/drivers/scsi/sata_vsc.c b/drivers/scsi/sata_vsc.c
index 836bbbb26ff..8a29ce340b4 100644
--- a/drivers/scsi/sata_vsc.c
+++ b/drivers/scsi/sata_vsc.c
@@ -263,7 +263,6 @@ static struct scsi_host_template vsc_sata_sht = {
 	.name			= DRV_NAME,
 	.ioctl			= ata_scsi_ioctl,
 	.queuecommand		= ata_scsi_queuecmd,
-	.eh_strategy_handler	= ata_scsi_error,
 	.can_queue		= ATA_DEF_QUEUE,
 	.this_id		= ATA_SHT_THIS_ID,
 	.sg_tablesize		= LIBATA_MAX_PRD,
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 5f0fdfb2618..1c75646f968 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -1537,8 +1537,8 @@ int scsi_error_handler(void *data)
 		 * what we need to do to get it up and online again (if we can).
 		 * If we fail, we end up taking the thing offline.
 		 */
-		if (shost->hostt->eh_strategy_handler) 
-			shost->hostt->eh_strategy_handler(shost);
+		if (shost->transportt->eh_strategy_handler)
+			shost->transportt->eh_strategy_handler(shost);
 		else
 			scsi_unjam_host(shost);
 
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 0d61357604d..b80d2e7fa6d 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -523,7 +523,6 @@ extern void ata_host_set_remove(struct ata_host_set *host_set);
 extern int ata_scsi_detect(struct scsi_host_template *sht);
 extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
 extern int ata_scsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *));
-extern int ata_scsi_error(struct Scsi_Host *host);
 extern void ata_eh_qc_complete(struct ata_queued_cmd *qc);
 extern void ata_eh_qc_retry(struct ata_queued_cmd *qc);
 extern int ata_scsi_release(struct Scsi_Host *host);
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index dc6862d09e5..de6ce541a04 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -140,7 +140,6 @@ struct scsi_host_template {
 	 *
 	 * Status: REQUIRED	(at least one of them)
 	 */
-	int (* eh_strategy_handler)(struct Scsi_Host *);
 	int (* eh_abort_handler)(struct scsi_cmnd *);
 	int (* eh_device_reset_handler)(struct scsi_cmnd *);
 	int (* eh_bus_reset_handler)(struct scsi_cmnd *);
diff --git a/include/scsi/scsi_transport.h b/include/scsi/scsi_transport.h
index b3657f11193..cca1d4926d2 100644
--- a/include/scsi/scsi_transport.h
+++ b/include/scsi/scsi_transport.h
@@ -50,6 +50,11 @@ struct scsi_transport_template {
 	unsigned int create_work_queue : 1;
 
 	/*
+	 * Allows a transport to override the default error handler.
+	 */
+	void (* eh_strategy_handler)(struct Scsi_Host *);
+
+	/*
 	 * This is an optional routine that allows the transport to become
 	 * involved when a scsi io timer fires. The return value tells the
 	 * timer routine how to finish the io timeout handling: