SCSI fixes on 20220521

Two patches both in drivers.  The iscsi one is fixing the cpumask
 issue you commented on and the ufs one is a late arriving fix for
 conditions that can occur in Host Performance Booster reads.
 
 Signed-off-by: James E.J. Bottomley <jejb@linux.ibm.com>
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Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi

Pull SCSI fixes from James Bottomley:
 "Two patches, both in drivers.

  The iscsi one is fixing the cpumask issue you commented on and the ufs
  one is a late arriving fix for conditions that can occur in Host
  Performance Booster reads"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: ufs: core: Fix referencing invalid rsp field
  scsi: target: Fix incorrect use of cpumask_t

drivers/scsi/ufs/ufshpb.c

@@ -1254,6 +1254,13 @@ void ufshpb_rsp_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
 	struct utp_hpb_rsp *rsp_field = &lrbp->ucd_rsp_ptr->hr;
 	int data_seg_len;
 
+	data_seg_len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2)
+		& MASK_RSP_UPIU_DATA_SEG_LEN;
+
+	/* If data segment length is zero, rsp_field is not valid */
+	if (!data_seg_len)
+		return;
+
 	if (unlikely(lrbp->lun != rsp_field->lun)) {
 		struct scsi_device *sdev;
 		bool found = false;
@@ -1288,18 +1295,6 @@ void ufshpb_rsp_upiu(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
 		return;
 	}
 
-	data_seg_len = be32_to_cpu(lrbp->ucd_rsp_ptr->header.dword_2)
-		& MASK_RSP_UPIU_DATA_SEG_LEN;
-
-	/* To flush remained rsp_list, we queue the map_work task */
-	if (!data_seg_len) {
-		if (!ufshpb_is_general_lun(hpb->lun))
-			return;
-
-		ufshpb_kick_map_work(hpb);
-		return;
-	}
-
 	BUILD_BUG_ON(sizeof(struct utp_hpb_rsp) != UTP_HPB_RSP_SIZE);
 
 	if (!ufshpb_is_hpb_rsp_valid(hba, lrbp, rsp_field))

drivers/target/iscsi/iscsi_target.c

@@ -3596,10 +3596,7 @@ static int iscsit_send_reject(
 void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
 {
 	int ord, cpu;
-	cpumask_t conn_allowed_cpumask;
-
-	cpumask_and(&conn_allowed_cpumask, iscsit_global->allowed_cpumask,
-		    cpu_online_mask);
+	cpumask_var_t conn_allowed_cpumask;
 
 	/*
 	 * bitmap_id is assigned from iscsit_global->ts_bitmap from
@@ -3609,13 +3606,28 @@ void iscsit_thread_get_cpumask(struct iscsi_conn *conn)
 	 * iSCSI connection's RX/TX threads will be scheduled to
 	 * execute upon.
 	 */
-	cpumask_clear(conn->conn_cpumask);
-	ord = conn->bitmap_id % cpumask_weight(&conn_allowed_cpumask);
-	for_each_cpu(cpu, &conn_allowed_cpumask) {
-		if (ord-- == 0) {
-			cpumask_set_cpu(cpu, conn->conn_cpumask);
-			return;
+	if (!zalloc_cpumask_var(&conn_allowed_cpumask, GFP_KERNEL)) {
+		ord = conn->bitmap_id % cpumask_weight(cpu_online_mask);
+		for_each_online_cpu(cpu) {
+			if (ord-- == 0) {
+				cpumask_set_cpu(cpu, conn->conn_cpumask);
+				return;
+			}
 		}
+	} else {
+		cpumask_and(conn_allowed_cpumask, iscsit_global->allowed_cpumask,
+			cpu_online_mask);
+
+		cpumask_clear(conn->conn_cpumask);
+		ord = conn->bitmap_id % cpumask_weight(conn_allowed_cpumask);
+		for_each_cpu(cpu, conn_allowed_cpumask) {
+			if (ord-- == 0) {
+				cpumask_set_cpu(cpu, conn->conn_cpumask);
+				free_cpumask_var(conn_allowed_cpumask);
+				return;
+			}
+		}
+		free_cpumask_var(conn_allowed_cpumask);
 	}
 	/*
 	 * This should never be reached..

drivers/target/iscsi/iscsi_target_configfs.c

@@ -1137,23 +1137,27 @@ static ssize_t lio_target_wwn_cpus_allowed_list_show(
 static ssize_t lio_target_wwn_cpus_allowed_list_store(
 		struct config_item *item, const char *page, size_t count)
 {
-	int ret;
+	int ret = -ENOMEM;
 	char *orig;
-	cpumask_t new_allowed_cpumask;
+	cpumask_var_t new_allowed_cpumask;
+
+	if (!zalloc_cpumask_var(&new_allowed_cpumask, GFP_KERNEL))
+		goto out;
 
 	orig = kstrdup(page, GFP_KERNEL);
 	if (!orig)
-		return -ENOMEM;
+		goto out_free_cpumask;
 
-	cpumask_clear(&new_allowed_cpumask);
-	ret = cpulist_parse(orig, &new_allowed_cpumask);
+	ret = cpulist_parse(orig, new_allowed_cpumask);
+	if (!ret)
+		cpumask_copy(iscsit_global->allowed_cpumask,
+			     new_allowed_cpumask);
 
 	kfree(orig);
-	if (ret != 0)
-		return ret;
-
-	cpumask_copy(iscsit_global->allowed_cpumask, &new_allowed_cpumask);
-	return count;
+out_free_cpumask:
+	free_cpumask_var(new_allowed_cpumask);
+out:
+	return ret ? ret : count;
 }
 
 CONFIGFS_ATTR(lio_target_wwn_, cpus_allowed_list);