Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6

* 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6:
  [S390] dcss: Initialize workqueue before using it.
  [S390] Remove BUILD_BUG_ON() in vmem code.
  [S390] sclp_tty/sclp_vt220: Fix scheduling while atomic
  [S390] dasd: fix panic caused by alias device offline
  [S390] dasd: add ifcc handling
  [S390] latencytop s390 support.
  [S390] Implement ext2_find_next_bit.
  [S390] Cleanup & optimize bitops.
  [S390] Define GENERIC_LOCKBREAK.
  [S390] console: allow vt220 console to be the only console
  [S390] Fix couple of section mismatches.
  [S390] Fix smp_call_function_mask semantics.
  [S390] Fix linker script.
  [S390] DEBUG_PAGEALLOC support for s390.
  [S390] cio: Add shutdown callback for ccwgroup.
  [S390] cio: Update documentation.
  [S390] cio: Clean up chsc response code handling.
  [S390] cio: make sense id procedure work with partial hardware response

3 files changed, 55 insertions, 31 deletions

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index d640427c74c8..d984e0fae630 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -1057,12 +1057,11 @@ void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
 		if (device->features & DASD_FEATURE_ERPLOG) {
 			dasd_log_sense(cqr, irb);
 		}
-		/* If we have no sense data, or we just don't want complex ERP
-		 * for this request, but if we have retries left, then just
-		 * reset this request and retry it in the fastpath
+		/*
+		 * If we don't want complex ERP for this request, then just
+		 * reset this and retry it in the fastpath
 		 */
-		if (!(cqr->irb.esw.esw0.erw.cons &&
-		      test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags)) &&
+		if (!test_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags) &&
 		    cqr->retries > 0) {
 			DEV_MESSAGE(KERN_DEBUG, device,
 				    "default ERP in fastpath (%i retries left)",
@@ -1707,7 +1706,7 @@ static void __dasd_cleanup_cqr(struct dasd_ccw_req *cqr)
 
 	req = (struct request *) cqr->callback_data;
 	dasd_profile_end(cqr->block, cqr, req);
-	status = cqr->memdev->discipline->free_cp(cqr, req);
+	status = cqr->block->base->discipline->free_cp(cqr, req);
 	if (status <= 0)
 		error = status ? status : -EIO;
 	dasd_end_request(req, error);
@@ -1742,12 +1741,8 @@ restart:
 
 		/*  Process requests that may be recovered */
 		if (cqr->status == DASD_CQR_NEED_ERP) {
-			if (cqr->irb.esw.esw0.erw.cons &&
-			    test_bit(DASD_CQR_FLAGS_USE_ERP,
-				     &cqr->flags)) {
-				erp_fn = base->discipline->erp_action(cqr);
-				erp_fn(cqr);
-			}
+			erp_fn = base->discipline->erp_action(cqr);
+			erp_fn(cqr);
 			goto restart;
 		}
 
diff --git a/drivers/s390/block/dasd_3990_erp.c b/drivers/s390/block/dasd_3990_erp.c
index c361ab69ec00..f69714a0e9e7 100644
--- a/drivers/s390/block/dasd_3990_erp.c
+++ b/drivers/s390/block/dasd_3990_erp.c
@@ -164,7 +164,7 @@ dasd_3990_erp_alternate_path(struct dasd_ccw_req * erp)
 
 		/* reset status to submit the request again... */
 		erp->status = DASD_CQR_FILLED;
-		erp->retries = 1;
+		erp->retries = 10;
 	} else {
 		DEV_MESSAGE(KERN_ERR, device,
 			    "No alternate channel path left (lpum=%x / "
@@ -301,8 +301,7 @@ dasd_3990_erp_action_4(struct dasd_ccw_req * erp, char *sense)
 		erp->function = dasd_3990_erp_action_4;
 
 	} else {
-
-		if (sense[25] == 0x1D) {	/* state change pending */
+		if (sense && (sense[25] == 0x1D)) { /* state change pending */
 
 			DEV_MESSAGE(KERN_INFO, device,
 				    "waiting for state change pending "
@@ -311,7 +310,7 @@ dasd_3990_erp_action_4(struct dasd_ccw_req * erp, char *sense)
 
 			dasd_3990_erp_block_queue(erp, 30*HZ);
 
-                } else if (sense[25] == 0x1E) {	/* busy */
+		} else if (sense && (sense[25] == 0x1E)) {	/* busy */
 			DEV_MESSAGE(KERN_INFO, device,
 				    "busy - redriving request later, "
 				    "%d retries left",
@@ -2120,6 +2119,34 @@ dasd_3990_erp_inspect_32(struct dasd_ccw_req * erp, char *sense)
  */
 
 /*
+ * DASD_3990_ERP_CONTROL_CHECK
+ *
+ * DESCRIPTION
+ *   Does a generic inspection if a control check occured and sets up
+ *   the related error recovery procedure
+ *
+ * PARAMETER
+ *   erp		pointer to the currently created default ERP
+ *
+ * RETURN VALUES
+ *   erp_filled		pointer to the erp
+ */
+
+static struct dasd_ccw_req *
+dasd_3990_erp_control_check(struct dasd_ccw_req *erp)
+{
+	struct dasd_device *device = erp->startdev;
+
+	if (erp->refers->irb.scsw.cstat & (SCHN_STAT_INTF_CTRL_CHK
+					   | SCHN_STAT_CHN_CTRL_CHK)) {
+		DEV_MESSAGE(KERN_DEBUG, device, "%s",
+			    "channel or interface control check");
+		erp = dasd_3990_erp_action_4(erp, NULL);
+	}
+	return erp;
+}
+
+/*
  * DASD_3990_ERP_INSPECT
  *
  * DESCRIPTION
@@ -2145,8 +2172,11 @@ dasd_3990_erp_inspect(struct dasd_ccw_req * erp)
 	if (erp_new)
 		return erp_new;
 
+	/* check if no concurrent sens is available */
+	if (!erp->refers->irb.esw.esw0.erw.cons)
+		erp_new = dasd_3990_erp_control_check(erp);
 	/* distinguish between 24 and 32 byte sense data */
-	if (sense[27] & DASD_SENSE_BIT_0) {
+	else if (sense[27] & DASD_SENSE_BIT_0) {
 
 		/* inspect the 24 byte sense data */
 		erp_new = dasd_3990_erp_inspect_24(erp, sense);
@@ -2285,6 +2315,17 @@ dasd_3990_erp_error_match(struct dasd_ccw_req *cqr1, struct dasd_ccw_req *cqr2)
 		//	return 0;	/* CCW doesn't match */
 	}
 
+	if (cqr1->irb.esw.esw0.erw.cons != cqr2->irb.esw.esw0.erw.cons)
+		return 0;
+
+	if ((cqr1->irb.esw.esw0.erw.cons == 0) &&
+	    (cqr2->irb.esw.esw0.erw.cons == 0))	{
+		if ((cqr1->irb.scsw.cstat & (SCHN_STAT_INTF_CTRL_CHK |
+					     SCHN_STAT_CHN_CTRL_CHK)) ==
+		    (cqr2->irb.scsw.cstat & (SCHN_STAT_INTF_CTRL_CHK |
+					     SCHN_STAT_CHN_CTRL_CHK)))
+			return 1; /* match with ifcc*/
+	}
 	/* check sense data; byte 0-2,25,27 */
 	if (!((memcmp (cqr1->irb.ecw, cqr2->irb.ecw, 3) == 0) &&
 	      (cqr1->irb.ecw[27] == cqr2->irb.ecw[27]) &&
@@ -2560,17 +2601,6 @@ dasd_3990_erp_action(struct dasd_ccw_req * cqr)
 
 		return cqr;
 	}
-	/* check if sense data are available */
-	if (!cqr->irb.ecw) {
-		DEV_MESSAGE(KERN_DEBUG, device,
-			    "ERP called witout sense data avail ..."
-			    "request %p - NO ERP possible", cqr);
-
-		cqr->status = DASD_CQR_FAILED;
-
-		return cqr;
-
-	}
 
 	/* check if error happened before */
 	erp = dasd_3990_erp_in_erp(cqr);
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c
index 7779bfce1c31..3faf0538b328 100644
--- a/drivers/s390/block/dcssblk.c
+++ b/drivers/s390/block/dcssblk.c
@@ -415,6 +415,8 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char
 	dev_info->gd->queue = dev_info->dcssblk_queue;
 	dev_info->gd->private_data = dev_info;
 	dev_info->gd->driverfs_dev = &dev_info->dev;
+	blk_queue_make_request(dev_info->dcssblk_queue, dcssblk_make_request);
+	blk_queue_hardsect_size(dev_info->dcssblk_queue, 4096);
 	/*
 	 * load the segment
 	 */
@@ -472,9 +474,6 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char
 	if (rc)
 		goto unregister_dev;
 
-	blk_queue_make_request(dev_info->dcssblk_queue, dcssblk_make_request);
-	blk_queue_hardsect_size(dev_info->dcssblk_queue, 4096);
-
 	add_disk(dev_info->gd);
 
 	switch (dev_info->segment_type) {