Merge tag 'for-linus-20190809' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:

 - Revert of a bcache patch that caused an oops for some (Coly)

 - ata rb532 unused warning fix (Gustavo)

 - AoE kernel crash fix (He)

 - Error handling fixup for blkdev_get() (Jan)

 - libata read/write translation and SFF PIO fix (me)

 - Use after free and error handling fix for O_DIRECT fragments. There's
   still a nowait + sync oddity in there, we'll nail that start next
   week. If all else fails, I'll queue a revert of the NOWAIT change.
   (me)

 - Loop GFP_KERNEL -> GFP_NOIO deadlock fix (Mikulas)

 - Two BFQ regression fixes that caused crashes (Paolo)

* tag 'for-linus-20190809' of git://git.kernel.dk/linux-block:
  bcache: Revert "bcache: use sysfs_match_string() instead of __sysfs_match_string()"
  loop: set PF_MEMALLOC_NOIO for the worker thread
  bdev: Fixup error handling in blkdev_get()
  block, bfq: handle NULL return value by bfq_init_rq()
  block, bfq: move update of waker and woken list to queue freeing
  block, bfq: reset last_completed_rq_bfqq if the pointed queue is freed
  block: aoe: Fix kernel crash due to atomic sleep when exiting
  libata: add SG safety checks in SFF pio transfers
  libata: have ata_scsi_rw_xlat() fail invalid passthrough requests
  block: fix O_DIRECT error handling for bio fragments
  ata: rb532_cf: Fix unused variable warning in rb532_pata_driver_probe

6 files changed, 50 insertions, 13 deletions

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 391ac0503dc0..76d0f9de767b 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1786,6 +1786,21 @@ nothing_to_do:
 	return 1;
 }
 
+static bool ata_check_nblocks(struct scsi_cmnd *scmd, u32 n_blocks)
+{
+	struct request *rq = scmd->request;
+	u32 req_blocks;
+
+	if (!blk_rq_is_passthrough(rq))
+		return true;
+
+	req_blocks = blk_rq_bytes(rq) / scmd->device->sector_size;
+	if (n_blocks > req_blocks)
+		return false;
+
+	return true;
+}
+
 /**
  *	ata_scsi_rw_xlat - Translate SCSI r/w command into an ATA one
  *	@qc: Storage for translated ATA taskfile
@@ -1830,6 +1845,8 @@ static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
 		scsi_10_lba_len(cdb, &block, &n_block);
 		if (cdb[1] & (1 << 3))
 			tf_flags |= ATA_TFLAG_FUA;
+		if (!ata_check_nblocks(scmd, n_block))
+			goto invalid_fld;
 		break;
 	case READ_6:
 	case WRITE_6:
@@ -1844,6 +1861,8 @@ static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
 		 */
 		if (!n_block)
 			n_block = 256;
+		if (!ata_check_nblocks(scmd, n_block))
+			goto invalid_fld;
 		break;
 	case READ_16:
 	case WRITE_16:
@@ -1854,6 +1873,8 @@ static unsigned int ata_scsi_rw_xlat(struct ata_queued_cmd *qc)
 		scsi_16_lba_len(cdb, &block, &n_block);
 		if (cdb[1] & (1 << 3))
 			tf_flags |= ATA_TFLAG_FUA;
+		if (!ata_check_nblocks(scmd, n_block))
+			goto invalid_fld;
 		break;
 	default:
 		DPRINTK("no-byte command\n");
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 10aa27882142..4f115adb4ee8 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -658,6 +658,10 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
 	unsigned int offset;
 	unsigned char *buf;
 
+	if (!qc->cursg) {
+		qc->curbytes = qc->nbytes;
+		return;
+	}
 	if (qc->curbytes == qc->nbytes - qc->sect_size)
 		ap->hsm_task_state = HSM_ST_LAST;
 
@@ -683,6 +687,8 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
 
 	if (qc->cursg_ofs == qc->cursg->length) {
 		qc->cursg = sg_next(qc->cursg);
+		if (!qc->cursg)
+			ap->hsm_task_state = HSM_ST_LAST;
 		qc->cursg_ofs = 0;
 	}
 }
diff --git a/drivers/ata/pata_rb532_cf.c b/drivers/ata/pata_rb532_cf.c
index 7c37f2ff09e4..deae466395de 100644
--- a/drivers/ata/pata_rb532_cf.c
+++ b/drivers/ata/pata_rb532_cf.c
@@ -158,7 +158,6 @@ static int rb532_pata_driver_probe(struct platform_device *pdev)
 static int rb532_pata_driver_remove(struct platform_device *pdev)
 {
 	struct ata_host *ah = platform_get_drvdata(pdev);
-	struct rb532_cf_info *info = ah->private_data;
 
 	ata_host_detach(ah);
 
diff --git a/drivers/block/aoe/aoedev.c b/drivers/block/aoe/aoedev.c
index 5b49f1b33ebe..e2ea2356da06 100644
--- a/drivers/block/aoe/aoedev.c
+++ b/drivers/block/aoe/aoedev.c
@@ -323,10 +323,14 @@ flush(const char __user *str, size_t cnt, int exiting)
 	}
 
 	flush_scheduled_work();
-	/* pass one: without sleeping, do aoedev_downdev */
+	/* pass one: do aoedev_downdev, which might sleep */
+restart1:
 	spin_lock_irqsave(&devlist_lock, flags);
 	for (d = devlist; d; d = d->next) {
 		spin_lock(&d->lock);
+		if (d->flags & DEVFL_TKILL)
+			goto cont;
+
 		if (exiting) {
 			/* unconditionally take each device down */
 		} else if (specified) {
@@ -338,8 +342,11 @@ flush(const char __user *str, size_t cnt, int exiting)
 		|| d->ref)
 			goto cont;
 
+		spin_unlock(&d->lock);
+		spin_unlock_irqrestore(&devlist_lock, flags);
 		aoedev_downdev(d);
 		d->flags |= DEVFL_TKILL;
+		goto restart1;
 cont:
 		spin_unlock(&d->lock);
 	}
@@ -348,7 +355,7 @@ cont:
 	/* pass two: call freedev, which might sleep,
 	 * for aoedevs marked with DEVFL_TKILL
 	 */
-restart:
+restart2:
 	spin_lock_irqsave(&devlist_lock, flags);
 	for (d = devlist; d; d = d->next) {
 		spin_lock(&d->lock);
@@ -357,7 +364,7 @@ restart:
 			spin_unlock(&d->lock);
 			spin_unlock_irqrestore(&devlist_lock, flags);
 			freedev(d);
-			goto restart;
+			goto restart2;
 		}
 		spin_unlock(&d->lock);
 	}
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 3036883fc9f8..ab7ca5989097 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -885,7 +885,7 @@ static void loop_unprepare_queue(struct loop_device *lo)
 
 static int loop_kthread_worker_fn(void *worker_ptr)
 {
-	current->flags |= PF_LESS_THROTTLE;
+	current->flags |= PF_LESS_THROTTLE | PF_MEMALLOC_NOIO;
 	return kthread_worker_fn(worker_ptr);
 }
 
diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index 9f0826712845..e2059af90791 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -23,24 +23,28 @@ static const char * const bch_cache_modes[] = {
 	"writethrough",
 	"writeback",
 	"writearound",
-	"none"
+	"none",
+	NULL
 };
 
 /* Default is 0 ("auto") */
 static const char * const bch_stop_on_failure_modes[] = {
 	"auto",
-	"always"
+	"always",
+	NULL
 };
 
 static const char * const cache_replacement_policies[] = {
 	"lru",
 	"fifo",
-	"random"
+	"random",
+	NULL
 };
 
 static const char * const error_actions[] = {
 	"unregister",
-	"panic"
+	"panic",
+	NULL
 };
 
 write_attribute(attach);
@@ -338,7 +342,7 @@ STORE(__cached_dev)
 	}
 
 	if (attr == &sysfs_cache_mode) {
-		v = sysfs_match_string(bch_cache_modes, buf);
+		v = __sysfs_match_string(bch_cache_modes, -1, buf);
 		if (v < 0)
 			return v;
 
@@ -349,7 +353,7 @@ STORE(__cached_dev)
 	}
 
 	if (attr == &sysfs_stop_when_cache_set_failed) {
-		v = sysfs_match_string(bch_stop_on_failure_modes, buf);
+		v = __sysfs_match_string(bch_stop_on_failure_modes, -1, buf);
 		if (v < 0)
 			return v;
 
@@ -816,7 +820,7 @@ STORE(__bch_cache_set)
 			    0, UINT_MAX);
 
 	if (attr == &sysfs_errors) {
-		v = sysfs_match_string(error_actions, buf);
+		v = __sysfs_match_string(error_actions, -1, buf);
 		if (v < 0)
 			return v;
 
@@ -1088,7 +1092,7 @@ STORE(__bch_cache)
 	}
 
 	if (attr == &sysfs_cache_replacement_policy) {
-		v = sysfs_match_string(cache_replacement_policies, buf);
+		v = __sysfs_match_string(cache_replacement_policies, -1, buf);
 		if (v < 0)
 			return v;