scsi: sd_zbc: Update write pointer offset cache

Recent changes changed the completion of SCSI commands from Soft-IRQ
context to IRQ context. This triggers the following warning, when we're
completing writes to zoned block devices that go through the zone append
emulation:

 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.12.0-rc2+ #2
 Hardware name: Supermicro Super Server/X10SRL-F, BIOS 2.0 12/17/2015
 RIP: 0010:__local_bh_disable_ip+0x3f/0x50
 RSP: 0018:ffff8883e1409ba8 EFLAGS: 00010006
 RAX: 0000000080010001 RBX: 0000000000000001 RCX: 0000000000000013
 RDX: ffff888129e4d200 RSI: 0000000000000201 RDI: ffffffff915b9dbd
 RBP: ffff888113e9a540 R08: ffff888113e9a540 R09: 00000000000077f0
 R10: 0000000000080000 R11: 0000000000000001 R12: ffff888129e4d200
 R13: 0000000000001000 R14: 00000000000077f0 R15: ffff888129e4d218
 FS:  0000000000000000(0000) GS:ffff8883e1400000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 00007f2f8418ebc0 CR3: 000000021202a006 CR4: 00000000001706f0
 Call Trace:
  <IRQ>
  _raw_spin_lock_bh+0x18/0x40
  sd_zbc_complete+0x43d/0x1150
  sd_done+0x631/0x1040
  ? mark_lock+0xe4/0x2fd0
  ? provisioning_mode_store+0x3f0/0x3f0
  scsi_finish_command+0x31b/0x5c0
  _scsih_io_done+0x960/0x29e0 [mpt3sas]
  ? mpt3sas_scsih_scsi_lookup_get+0x1c7/0x340 [mpt3sas]
  ? __lock_acquire+0x166b/0x58b0
  ? _get_st_from_smid+0x4a/0x80 [mpt3sas]
  _base_process_reply_queue+0x23f/0x26e0 [mpt3sas]
  ? lock_is_held_type+0x98/0x110
  ? find_held_lock+0x2c/0x110
  ? mpt3sas_base_sync_reply_irqs+0x360/0x360 [mpt3sas]
  _base_interrupt+0x8d/0xd0 [mpt3sas]
  ? rcu_read_lock_sched_held+0x3f/0x70
  __handle_irq_event_percpu+0x24d/0x600
  handle_irq_event+0xef/0x240
  ? handle_irq_event_percpu+0x110/0x110
  handle_edge_irq+0x1f6/0xb60
  __common_interrupt+0x75/0x160
  common_interrupt+0x7b/0xa0
  </IRQ>
  asm_common_interrupt+0x1e/0x40

Don't use spin_lock_bh() to protect the update of the write pointer offset
cache, but use spin_lock_irqsave() for it.

Link: https://lore.kernel.org/r/3cfebe48d09db73041b7849be71ffbcec7ee40b3.1615369586.git.johannes.thumshirn@wdc.com
Fixes: 664f0dc ("scsi: mpt3sas: Add support for shared host tagset for CPU hotplug")
Reported-by: Shinichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Tested-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: morbidrsa

drivers/scsi/sd_zbc.c

@@ -280,27 +280,28 @@ static int sd_zbc_update_wp_offset_cb(struct blk_zone *zone, unsigned int idx,
 static void sd_zbc_update_wp_offset_workfn(struct work_struct *work)
 {
 	struct scsi_disk *sdkp;
+	unsigned long flags;
 	unsigned int zno;
 	int ret;
 
 	sdkp = container_of(work, struct scsi_disk, zone_wp_offset_work);
 
-	spin_lock_bh(&sdkp->zones_wp_offset_lock);
+	spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags);
 	for (zno = 0; zno < sdkp->nr_zones; zno++) {
 		if (sdkp->zones_wp_offset[zno] != SD_ZBC_UPDATING_WP_OFST)
 			continue;
 
-		spin_unlock_bh(&sdkp->zones_wp_offset_lock);
+		spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
 		ret = sd_zbc_do_report_zones(sdkp, sdkp->zone_wp_update_buf,
 					     SD_BUF_SIZE,
 					     zno * sdkp->zone_blocks, true);
-		spin_lock_bh(&sdkp->zones_wp_offset_lock);
+		spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags);
 		if (!ret)
 			sd_zbc_parse_report(sdkp, sdkp->zone_wp_update_buf + 64,
 					    zno, sd_zbc_update_wp_offset_cb,
 					    sdkp);
 	}
-	spin_unlock_bh(&sdkp->zones_wp_offset_lock);
+	spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
 
 	scsi_device_put(sdkp->device);
 }
@@ -324,6 +325,7 @@ blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd, sector_t *lba,
 	struct request *rq = cmd->request;
 	struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 	unsigned int wp_offset, zno = blk_rq_zone_no(rq);
+	unsigned long flags;
 	blk_status_t ret;
 
 	ret = sd_zbc_cmnd_checks(cmd);
@@ -337,7 +339,7 @@ blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd, sector_t *lba,
 	if (!blk_req_zone_write_trylock(rq))
 		return BLK_STS_ZONE_RESOURCE;
 
-	spin_lock_bh(&sdkp->zones_wp_offset_lock);
+	spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags);
 	wp_offset = sdkp->zones_wp_offset[zno];
 	switch (wp_offset) {
 	case SD_ZBC_INVALID_WP_OFST:
@@ -366,7 +368,7 @@ blk_status_t sd_zbc_prepare_zone_append(struct scsi_cmnd *cmd, sector_t *lba,
 
 		*lba += wp_offset;
 	}
-	spin_unlock_bh(&sdkp->zones_wp_offset_lock);
+	spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
 	if (ret)
 		blk_req_zone_write_unlock(rq);
 	return ret;
@@ -445,14 +447,15 @@ static unsigned int sd_zbc_zone_wp_update(struct scsi_cmnd *cmd,
 	struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
 	unsigned int zno = blk_rq_zone_no(rq);
 	enum req_opf op = req_op(rq);
+	unsigned long flags;
 
 	/*
 	 * If we got an error for a command that needs updating the write
 	 * pointer offset cache, we must mark the zone wp offset entry as
 	 * invalid to force an update from disk the next time a zone append
 	 * command is issued.
 	 */
-	spin_lock_bh(&sdkp->zones_wp_offset_lock);
+	spin_lock_irqsave(&sdkp->zones_wp_offset_lock, flags);
 
 	if (result && op != REQ_OP_ZONE_RESET_ALL) {
 		if (op == REQ_OP_ZONE_APPEND) {
@@ -496,7 +499,7 @@ static unsigned int sd_zbc_zone_wp_update(struct scsi_cmnd *cmd,
 	}
 
 unlock_wp_offset:
-	spin_unlock_bh(&sdkp->zones_wp_offset_lock);
+	spin_unlock_irqrestore(&sdkp->zones_wp_offset_lock, flags);
 
 	return good_bytes;
 }