block-5.14-2021-08-07

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Merge tag 'block-5.14-2021-08-07' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "A few minor fixes:

   - Fix ldm kernel-doc warning (Bart)

   - Fix adding offset twice for DMA address in n64cart (Christoph)

   - Fix use-after-free in dasd path handling (Stefan)

   - Order kyber insert trace correctly (Vincent)

   - raid1 errored write handling fix (Wei)

   - Fix blk-iolatency queue get failure handling (Yu)"

* tag 'block-5.14-2021-08-07' of git://git.kernel.dk/linux-block:
  kyber: make trace_block_rq call consistent with documentation
  block/partitions/ldm.c: Fix a kernel-doc warning
  blk-iolatency: error out if blk_get_queue() failed in iolatency_set_limit()
  n64cart: fix the dma address in n64cart_do_bvec
  s390/dasd: fix use after free in dasd path handling
  md/raid10: properly indicate failure when ending a failed write request

block/blk-iolatency.c

@@ -833,7 +833,11 @@ static ssize_t iolatency_set_limit(struct kernfs_open_file *of, char *buf,
 
 	enable = iolatency_set_min_lat_nsec(blkg, lat_val);
 	if (enable) {
-		WARN_ON_ONCE(!blk_get_queue(blkg->q));
+		if (!blk_get_queue(blkg->q)) {
+			ret = -ENODEV;
+			goto out;
+		}
+
 		blkg_get(blkg);
 	}
 

block/kyber-iosched.c

@@ -596,13 +596,13 @@ static void kyber_insert_requests(struct blk_mq_hw_ctx *hctx,
 		struct list_head *head = &kcq->rq_list[sched_domain];
 
 		spin_lock(&kcq->lock);
+		trace_block_rq_insert(rq);
 		if (at_head)
 			list_move(&rq->queuelist, head);
 		else
 			list_move_tail(&rq->queuelist, head);
 		sbitmap_set_bit(&khd->kcq_map[sched_domain],
 				rq->mq_ctx->index_hw[hctx->type]);
-		trace_block_rq_insert(rq);
 		spin_unlock(&kcq->lock);
 	}
 }

block/partitions/ldm.c

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
-/**
+/*
  * ldm - Support for Windows Logical Disk Manager (Dynamic Disks)
  *
  * Copyright (C) 2001,2002 Richard Russon <ldm@flatcap.org>

drivers/block/n64cart.c

@@ -74,7 +74,7 @@ static bool n64cart_do_bvec(struct device *dev, struct bio_vec *bv, u32 pos)
 
 	n64cart_wait_dma();
 
-	n64cart_write_reg(PI_DRAM_REG, dma_addr + bv->bv_offset);
+	n64cart_write_reg(PI_DRAM_REG, dma_addr);
 	n64cart_write_reg(PI_CART_REG, (bstart | CART_DOMAIN) & CART_MAX);
 	n64cart_write_reg(PI_WRITE_REG, bv->bv_len - 1);
 

drivers/md/raid1.c

@@ -474,8 +474,6 @@ static void raid1_end_write_request(struct bio *bio)
 		/*
 		 * When the device is faulty, it is not necessary to
 		 * handle write error.
-		 * For failfast, this is the only remaining device,
-		 * We need to retry the write without FailFast.
 		 */
 		if (!test_bit(Faulty, &rdev->flags))
 			set_bit(R1BIO_WriteError, &r1_bio->state);

drivers/md/raid10.c

@@ -471,12 +471,12 @@ static void raid10_end_write_request(struct bio *bio)
 			/*
 			 * When the device is faulty, it is not necessary to
 			 * handle write error.
-			 * For failfast, this is the only remaining device,
-			 * We need to retry the write without FailFast.
 			 */
 			if (!test_bit(Faulty, &rdev->flags))
 				set_bit(R10BIO_WriteError, &r10_bio->state);
 			else {
+				/* Fail the request */
+				set_bit(R10BIO_Degraded, &r10_bio->state);
 				r10_bio->devs[slot].bio = NULL;
 				to_put = bio;
 				dec_rdev = 1;

drivers/s390/block/dasd_eckd.c

@@ -1004,15 +1004,23 @@ static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 static void dasd_eckd_store_conf_data(struct dasd_device *device,
 				      struct dasd_conf_data *conf_data, int chp)
 {
+	struct dasd_eckd_private *private = device->private;
 	struct channel_path_desc_fmt0 *chp_desc;
 	struct subchannel_id sch_id;
+	void *cdp;
 
-	ccw_device_get_schid(device->cdev, &sch_id);
 	/*
 	 * path handling and read_conf allocate data
 	 * free it before replacing the pointer
+	 * also replace the old private->conf_data pointer
+	 * with the new one if this points to the same data
 	 */
-	kfree(device->path[chp].conf_data);
+	cdp = device->path[chp].conf_data;
+	if (private->conf_data == cdp) {
+		private->conf_data = (void *)conf_data;
+		dasd_eckd_identify_conf_parts(private);
+	}
+	ccw_device_get_schid(device->cdev, &sch_id);
 	device->path[chp].conf_data = conf_data;
 	device->path[chp].cssid = sch_id.cssid;
 	device->path[chp].ssid = sch_id.ssid;
@@ -1020,6 +1028,7 @@ static void dasd_eckd_store_conf_data(struct dasd_device *device,
 	if (chp_desc)
 		device->path[chp].chpid = chp_desc->chpid;
 	kfree(chp_desc);
+	kfree(cdp);
 }
 
 static void dasd_eckd_clear_conf_data(struct dasd_device *device)