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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/target/target_core_sbc.c
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..
@@ -1,23 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * SCSI Block Commands (SBC) parsing and emulation.
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  *
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  * (c) Copyright 2002-2013 Datera, Inc.
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  *
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  * Nicholas A. Bellinger <nab@kernel.org>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License as published by
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- * the Free Software Foundation; either version 2 of the License, or
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- * (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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  */
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9
 
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 #include <linux/kernel.h>
..
..
@@ -360,6 +347,10 @@
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 	unsigned int offset;
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 	sense_reason_t ret = TCM_NO_SENSE;
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 	int i, count;
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+
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+	if (!success)
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+		return 0;
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+
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 	/*
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 	 * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command
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 	 *
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@@ -425,14 +416,8 @@
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 	struct se_device *dev = cmd->se_dev;
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 	sense_reason_t ret = TCM_NO_SENSE;
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418
 
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-	/*
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-	 * Only set SCF_COMPARE_AND_WRITE_POST to force a response fall-through
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-	 * within target_complete_ok_work() if the command was successfully
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-	 * sent to the backend driver.
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-	 */
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 	spin_lock_irq(&cmd->t_state_lock);
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-	if (cmd->transport_state & CMD_T_SENT) {
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-		cmd->se_cmd_flags |= SCF_COMPARE_AND_WRITE_POST;
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+	if (success) {
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 		*post_ret = 1;
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422
 
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 		if (cmd->scsi_status == SAM_STAT_CHECK_CONDITION)
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@@ -453,7 +438,8 @@
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 						 int *post_ret)
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 {
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 	struct se_device *dev = cmd->se_dev;
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-	struct scatterlist *write_sg = NULL, *sg;
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+	struct sg_table write_tbl = { };
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+	struct scatterlist *write_sg, *sg;
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 	unsigned char *buf = NULL, *addr;
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 	struct sg_mapping_iter m;
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 	unsigned int offset = 0, len;
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@@ -494,14 +480,12 @@
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 		goto out;
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 	}
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-	write_sg = kmalloc_array(cmd->t_data_nents, sizeof(*write_sg),
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-				 GFP_KERNEL);
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-	if (!write_sg) {
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+	if (sg_alloc_table(&write_tbl, cmd->t_data_nents, GFP_KERNEL) < 0) {
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 		pr_err("Unable to allocate compare_and_write sg\n");
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 		ret = TCM_OUT_OF_RESOURCES;
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 		goto out;
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 	}
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-	sg_init_table(write_sg, cmd->t_data_nents);
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+	write_sg = write_tbl.sgl;
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 	/*
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 	 * Setup verify and write data payloads from total NumberLBAs.
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 	 */
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@@ -597,7 +581,7 @@
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 	 * sbc_compare_and_write() before the original READ I/O submission.
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 	 */
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 	up(&dev->caw_sem);
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-	kfree(write_sg);
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+	sg_free_table(&write_tbl);
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 	kfree(buf);
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 	return ret;
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 }
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@@ -749,7 +733,7 @@
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 		}
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 		if (!protect)
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 			return TCM_NO_SENSE;
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-		/* Fallthrough */
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+		fallthrough;
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 	default:
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 		pr_err("Unable to determine pi_prot_type for CDB: 0x%02x "
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 		       "PROTECT: 0x%02x\n", cmd->t_task_cdb[0], protect);