[SCSI] iscsi_ibft, be2iscsi, iscsi_boot: fix boot kobj data lifetime management

be2iscsi passes the boot functions its phba object which is
allocated in the shost, but iscsi_ibft passes in a object
allocated for each item to display. The problem is that
iscsi_boot_sysfs was managing the lifetime of the object
passed in and doing a kfree on release. This causes a double
free for be2iscsi which frees the shost in its pci_remove.

This patch fixes the problem by adding a release callback
which the drivers can call kfree or a put() type of function
(needed for be2iscsi which will do a get/put on the shost).

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

4 files changed, 142 insertions, 106 deletions

diff --git a/drivers/firmware/iscsi_ibft.c b/drivers/firmware/iscsi_ibft.c
index ce33f46..c811cb1 100644
--- a/drivers/firmware/iscsi_ibft.c
+++ b/drivers/firmware/iscsi_ibft.c
@@ -566,6 +566,11 @@ static mode_t __init ibft_check_initiator_for(void *data, int type)
 	return rc;
 }
 
+static void ibft_kobj_release(void *data)
+{
+	kfree(data);
+}
+
 /*
  * Helper function for ibft_register_kobjects.
  */
@@ -595,7 +600,8 @@ static int __init ibft_create_kobject(struct acpi_table_ibft *header,
 		boot_kobj = iscsi_boot_create_initiator(boot_kset, hdr->index,
 						ibft_kobj,
 						ibft_attr_show_initiator,
-						ibft_check_initiator_for);
+						ibft_check_initiator_for,
+						ibft_kobj_release);
 		if (!boot_kobj) {
 			rc = -ENOMEM;
 			goto free_ibft_obj;
@@ -610,7 +616,8 @@ static int __init ibft_create_kobject(struct acpi_table_ibft *header,
 		boot_kobj = iscsi_boot_create_ethernet(boot_kset, hdr->index,
 						       ibft_kobj,
 						       ibft_attr_show_nic,
-						       ibft_check_nic_for);
+						       ibft_check_nic_for,
+						       ibft_kobj_release);
 		if (!boot_kobj) {
 			rc = -ENOMEM;
 			goto free_ibft_obj;
@@ -625,7 +632,8 @@ static int __init ibft_create_kobject(struct acpi_table_ibft *header,
 		boot_kobj = iscsi_boot_create_target(boot_kset, hdr->index,
 						     ibft_kobj,
 						     ibft_attr_show_target,
-						     ibft_check_tgt_for);
+						     ibft_check_tgt_for,
+						     ibft_kobj_release);
 		if (!boot_kobj) {
 			rc = -ENOMEM;
 			goto free_ibft_obj;
diff --git a/drivers/scsi/be2iscsi/be_main.c b/drivers/scsi/be2iscsi/be_main.c
index 2e21439..0a9bdfa 100644
--- a/drivers/scsi/be2iscsi/be_main.c
+++ b/drivers/scsi/be2iscsi/be_main.c
@@ -215,73 +215,62 @@ unlock:
 static ssize_t beiscsi_show_boot_tgt_info(void *data, int type, char *buf)
 {
 	struct beiscsi_hba *phba = data;
+	struct mgmt_session_info *boot_sess = &phba->boot_sess;
+	struct mgmt_conn_info *boot_conn = &boot_sess->conn_list[0];
 	char *str = buf;
 	int rc;
 
 	switch (type) {
 	case ISCSI_BOOT_TGT_NAME:
 		rc = sprintf(buf, "%.*s\n",
-				(int)strlen(phba->boot_sess.target_name),
-				(char *)&phba->boot_sess.target_name);
+			    (int)strlen(boot_sess->target_name),
+			    (char *)&boot_sess->target_name);
 		break;
 	case ISCSI_BOOT_TGT_IP_ADDR:
-		if (phba->boot_sess.conn_list[0].dest_ipaddr.ip_type == 0x1)
+		if (boot_conn->dest_ipaddr.ip_type == 0x1)
 			rc = sprintf(buf, "%pI4\n",
-				(char *)&phba->boot_sess.conn_list[0].
-				dest_ipaddr.ip_address);
+				(char *)&boot_conn->dest_ipaddr.ip_address);
 		else
 			rc = sprintf(str, "%pI6\n",
-				(char *)&phba->boot_sess.conn_list[0].
-				dest_ipaddr.ip_address);
+				(char *)&boot_conn->dest_ipaddr.ip_address);
 		break;
 	case ISCSI_BOOT_TGT_PORT:
-		rc = sprintf(str, "%d\n", phba->boot_sess.conn_list[0].
-				  dest_port);
+		rc = sprintf(str, "%d\n", boot_conn->dest_port);
 		break;
 
 	case ISCSI_BOOT_TGT_CHAP_NAME:
 		rc = sprintf(str,  "%.*s\n",
-				      phba->boot_sess.conn_list[0].
-				      negotiated_login_options.auth_data.chap.
-				      target_chap_name_length,
-				      (char *)&phba->boot_sess.conn_list[0].
-				      negotiated_login_options.auth_data.chap.
-				      target_chap_name);
+			     boot_conn->negotiated_login_options.auth_data.chap.
+			     target_chap_name_length,
+			     (char *)&boot_conn->negotiated_login_options.
+			     auth_data.chap.target_chap_name);
 		break;
 	case ISCSI_BOOT_TGT_CHAP_SECRET:
 		rc = sprintf(str,  "%.*s\n",
-				      phba->boot_sess.conn_list[0].
-				      negotiated_login_options.auth_data.chap.
-				      target_secret_length,
-				      (char *)&phba->boot_sess.conn_list[0].
-				      negotiated_login_options.auth_data.chap.
-				      target_secret);
-
+			     boot_conn->negotiated_login_options.auth_data.chap.
+			     target_secret_length,
+			     (char *)&boot_conn->negotiated_login_options.
+			     auth_data.chap.target_secret);
 		break;
 	case ISCSI_BOOT_TGT_REV_CHAP_NAME:
 		rc = sprintf(str,  "%.*s\n",
-				      phba->boot_sess.conn_list[0].
-				      negotiated_login_options.auth_data.chap.
-				      intr_chap_name_length,
-				      (char *)&phba->boot_sess.conn_list[0].
-				      negotiated_login_options.auth_data.chap.
-				      intr_chap_name);
-
+			     boot_conn->negotiated_login_options.auth_data.chap.
+			     intr_chap_name_length,
+			     (char *)&boot_conn->negotiated_login_options.
+			     auth_data.chap.intr_chap_name);
 		break;
 	case ISCSI_BOOT_TGT_REV_CHAP_SECRET:
-			rc = sprintf(str,  "%.*s\n",
-				      phba->boot_sess.conn_list[0].
-				      negotiated_login_options.auth_data.chap.
-				      intr_secret_length,
-				      (char *)&phba->boot_sess.conn_list[0].
-				      negotiated_login_options.auth_data.chap.
-				      intr_secret);
+		rc = sprintf(str,  "%.*s\n",
+			     boot_conn->negotiated_login_options.auth_data.chap.
+			     intr_secret_length,
+			     (char *)&boot_conn->negotiated_login_options.
+			     auth_data.chap.intr_secret);
 		break;
 	case ISCSI_BOOT_TGT_FLAGS:
-			rc = sprintf(str, "2\n");
+		rc = sprintf(str, "2\n");
 		break;
 	case ISCSI_BOOT_TGT_NIC_ASSOC:
-			rc = sprintf(str, "0\n");
+		rc = sprintf(str, "0\n");
 		break;
 	default:
 		rc = -ENOSYS;
@@ -315,10 +304,10 @@ static ssize_t beiscsi_show_boot_eth_info(void *data, int type, char *buf)
 
 	switch (type) {
 	case ISCSI_BOOT_ETH_FLAGS:
-			rc = sprintf(str, "2\n");
+		rc = sprintf(str, "2\n");
 		break;
 	case ISCSI_BOOT_ETH_INDEX:
-			rc = sprintf(str, "0\n");
+		rc = sprintf(str, "0\n");
 		break;
 	case ISCSI_BOOT_ETH_MAC:
 		rc  = beiscsi_get_macaddr(buf, phba);
@@ -391,39 +380,6 @@ static mode_t beiscsi_eth_get_attr_visibility(void *data, int type)
 	return rc;
 }
 
-static int beiscsi_setup_boot_info(struct beiscsi_hba *phba)
-{
-	struct iscsi_boot_kobj *boot_kobj;
-
-	phba->boot_kset = iscsi_boot_create_host_kset(phba->shost->host_no);
-	if (!phba->boot_kset)
-		return -ENOMEM;
-
-	/* get boot info using mgmt cmd */
-	boot_kobj = iscsi_boot_create_target(phba->boot_kset, 0, phba,
-					     beiscsi_show_boot_tgt_info,
-					     beiscsi_tgt_get_attr_visibility);
-	if (!boot_kobj)
-		goto free_kset;
-
-	boot_kobj = iscsi_boot_create_initiator(phba->boot_kset, 0, phba,
-					     beiscsi_show_boot_ini_info,
-					     beiscsi_ini_get_attr_visibility);
-	if (!boot_kobj)
-		goto free_kset;
-
-	boot_kobj = iscsi_boot_create_ethernet(phba->boot_kset, 0, phba,
-					     beiscsi_show_boot_eth_info,
-					     beiscsi_eth_get_attr_visibility);
-	if (!boot_kobj)
-		goto free_kset;
-	return 0;
-
-free_kset:
-	iscsi_boot_destroy_kset(phba->boot_kset);
-	return -ENOMEM;
-}
-
 /*------------------- PCI Driver operations and data ----------------- */
 static DEFINE_PCI_DEVICE_TABLE(beiscsi_pci_id_table) = {
 	{ PCI_DEVICE(BE_VENDOR_ID, BE_DEVICE_ID1) },
@@ -482,14 +438,6 @@ static struct beiscsi_hba *beiscsi_hba_alloc(struct pci_dev *pcidev)
 	if (iscsi_host_add(shost, &phba->pcidev->dev))
 		goto free_devices;
 
-	if (beiscsi_setup_boot_info(phba))
-		/*
-		 * log error but continue, because we may not be using
-		 * iscsi boot.
-		 */
-		shost_printk(KERN_ERR, phba->shost, "Could not set up "
-		"iSCSI boot info.");
-
 	return phba;
 
 free_devices:
@@ -3510,6 +3458,7 @@ static int beiscsi_get_boot_info(struct beiscsi_hba *phba)
 	unsigned int tag, wrb_num;
 	unsigned short status, extd_status;
 	struct be_queue_info *mccq = &phba->ctrl.mcc_obj.q;
+	int ret = -ENOMEM;
 
 	tag = beiscsi_get_boot_target(phba);
 	if (!tag) {
@@ -3534,8 +3483,7 @@ static int beiscsi_get_boot_info(struct beiscsi_hba *phba)
 	boot_resp = embedded_payload(wrb);
 
 	if (boot_resp->boot_session_handle < 0) {
-		printk(KERN_ERR "No Boot Session for this pci_func,"
-			"session Hndl = %d\n", boot_resp->boot_session_handle);
+		shost_printk(KERN_INFO, phba->shost, "No Boot Session.\n");
 		return -ENXIO;
 	}
 
@@ -3573,14 +3521,70 @@ static int beiscsi_get_boot_info(struct beiscsi_hba *phba)
 	wrb = queue_get_wrb(mccq, wrb_num);
 	free_mcc_tag(&phba->ctrl, tag);
 	session_resp = nonemb_cmd.va ;
+
 	memcpy(&phba->boot_sess, &session_resp->session_info,
 	       sizeof(struct mgmt_session_info));
-	pci_free_consistent(phba->ctrl.pdev, nonemb_cmd.size,
-		    nonemb_cmd.va, nonemb_cmd.dma);
-	return 0;
+	ret = 0;
+
 boot_freemem:
 	pci_free_consistent(phba->ctrl.pdev, nonemb_cmd.size,
 		    nonemb_cmd.va, nonemb_cmd.dma);
+	return ret;
+}
+
+static void beiscsi_boot_release(void *data)
+{
+	struct beiscsi_hba *phba = data;
+
+	scsi_host_put(phba->shost);
+}
+
+static int beiscsi_setup_boot_info(struct beiscsi_hba *phba)
+{
+	struct iscsi_boot_kobj *boot_kobj;
+
+	/* get boot info using mgmt cmd */
+	if (beiscsi_get_boot_info(phba))
+		/* Try to see if we can carry on without this */
+		return 0;
+
+	phba->boot_kset = iscsi_boot_create_host_kset(phba->shost->host_no);
+	if (!phba->boot_kset)
+		return -ENOMEM;
+
+	/* get a ref because the show function will ref the phba */
+	if (!scsi_host_get(phba->shost))
+		goto free_kset;
+	boot_kobj = iscsi_boot_create_target(phba->boot_kset, 0, phba,
+					     beiscsi_show_boot_tgt_info,
+					     beiscsi_tgt_get_attr_visibility,
+					     beiscsi_boot_release);
+	if (!boot_kobj)
+		goto put_shost;
+
+	if (!scsi_host_get(phba->shost))
+		goto free_kset;
+	boot_kobj = iscsi_boot_create_initiator(phba->boot_kset, 0, phba,
+						beiscsi_show_boot_ini_info,
+						beiscsi_ini_get_attr_visibility,
+						beiscsi_boot_release);
+	if (!boot_kobj)
+		goto put_shost;
+
+	if (!scsi_host_get(phba->shost))
+		goto free_kset;
+	boot_kobj = iscsi_boot_create_ethernet(phba->boot_kset, 0, phba,
+					       beiscsi_show_boot_eth_info,
+					       beiscsi_eth_get_attr_visibility,
+					       beiscsi_boot_release);
+	if (!boot_kobj)
+		goto put_shost;
+	return 0;
+
+put_shost:
+	scsi_host_put(phba->shost);
+free_kset:
+	iscsi_boot_destroy_kset(phba->boot_kset);
 	return -ENOMEM;
 }
 
@@ -4307,11 +4311,15 @@ static int __devinit beiscsi_dev_probe(struct pci_dev *pcidev,
 		goto free_blkenbld;
 	}
 	hwi_enable_intr(phba);
-	ret = beiscsi_get_boot_info(phba);
-	if (ret < 0) {
-		shost_printk(KERN_ERR, phba->shost, "beiscsi_dev_probe-"
-			     "No Boot Devices !!!!!\n");
-	}
+
+	if (beiscsi_setup_boot_info(phba))
+		/*
+		 * log error but continue, because we may not be using
+		 * iscsi boot.
+		 */
+		shost_printk(KERN_ERR, phba->shost, "Could not set up "
+			     "iSCSI boot info.");
+
 	SE_DEBUG(DBG_LVL_8, "\n\n\n SUCCESS - DRIVER LOADED\n\n\n");
 	return 0;
 
diff --git a/drivers/scsi/iscsi_boot_sysfs.c b/drivers/scsi/iscsi_boot_sysfs.c
index 4274ce9..89700cb 100644
--- a/drivers/scsi/iscsi_boot_sysfs.c
+++ b/drivers/scsi/iscsi_boot_sysfs.c
@@ -64,7 +64,8 @@ static void iscsi_boot_kobj_release(struct kobject *kobj)
 	struct iscsi_boot_kobj *boot_kobj =
 			container_of(kobj, struct iscsi_boot_kobj, kobj);
 
-	kfree(boot_kobj->data);
+	if (boot_kobj->release)
+		boot_kobj->release(boot_kobj->data);
 	kfree(boot_kobj);
 }
 
@@ -305,7 +306,8 @@ iscsi_boot_create_kobj(struct iscsi_boot_kset *boot_kset,
 		       struct attribute_group *attr_group,
 		       const char *name, int index, void *data,
 		       ssize_t (*show) (void *data, int type, char *buf),
-		       mode_t (*is_visible) (void *data, int type))
+		       mode_t (*is_visible) (void *data, int type),
+		       void (*release) (void *data))
 {
 	struct iscsi_boot_kobj *boot_kobj;
 
@@ -323,6 +325,7 @@ iscsi_boot_create_kobj(struct iscsi_boot_kset *boot_kset,
 	boot_kobj->data = data;
 	boot_kobj->show = show;
 	boot_kobj->is_visible = is_visible;
+	boot_kobj->release = release;
 
 	if (sysfs_create_group(&boot_kobj->kobj, attr_group)) {
 		/*
@@ -331,7 +334,7 @@ iscsi_boot_create_kobj(struct iscsi_boot_kset *boot_kset,
 		 * the boot kobj was not setup and the normal release
 		 * path is not being run.
 		 */
-		boot_kobj->data = NULL;
+		boot_kobj->release = NULL;
 		kobject_put(&boot_kobj->kobj);
 		return NULL;
 	}
@@ -357,6 +360,7 @@ static void iscsi_boot_remove_kobj(struct iscsi_boot_kobj *boot_kobj)
  * @data: driver specific data for target
  * @show: attr show function
  * @is_visible: attr visibility function
+ * @release: release function
  *
  * Note: The boot sysfs lib will free the data passed in for the caller
  * when all refs to the target kobject have been released.
@@ -365,10 +369,12 @@ struct iscsi_boot_kobj *
 iscsi_boot_create_target(struct iscsi_boot_kset *boot_kset, int index,
 			 void *data,
 			 ssize_t (*show) (void *data, int type, char *buf),
-			 mode_t (*is_visible) (void *data, int type))
+			 mode_t (*is_visible) (void *data, int type),
+			 void (*release) (void *data))
 {
 	return iscsi_boot_create_kobj(boot_kset, &iscsi_boot_target_attr_group,
-				      "target%d", index, data, show, is_visible);
+				      "target%d", index, data, show, is_visible,
+				      release);
 }
 EXPORT_SYMBOL_GPL(iscsi_boot_create_target);
 
@@ -379,6 +385,7 @@ EXPORT_SYMBOL_GPL(iscsi_boot_create_target);
  * @data: driver specific data
  * @show: attr show function
  * @is_visible: attr visibility function
+ * @release: release function
  *
  * Note: The boot sysfs lib will free the data passed in for the caller
  * when all refs to the initiator kobject have been released.
@@ -387,12 +394,13 @@ struct iscsi_boot_kobj *
 iscsi_boot_create_initiator(struct iscsi_boot_kset *boot_kset, int index,
 			    void *data,
 			    ssize_t (*show) (void *data, int type, char *buf),
-			    mode_t (*is_visible) (void *data, int type))
+			    mode_t (*is_visible) (void *data, int type),
+			    void (*release) (void *data))
 {
 	return iscsi_boot_create_kobj(boot_kset,
 				      &iscsi_boot_initiator_attr_group,
 				      "initiator", index, data, show,
-				      is_visible);
+				      is_visible, release);
 }
 EXPORT_SYMBOL_GPL(iscsi_boot_create_initiator);
 
@@ -403,6 +411,7 @@ EXPORT_SYMBOL_GPL(iscsi_boot_create_initiator);
  * @data: driver specific data
  * @show: attr show function
  * @is_visible: attr visibility function
+ * @release: release function
  *
  * Note: The boot sysfs lib will free the data passed in for the caller
  * when all refs to the ethernet kobject have been released.
@@ -411,12 +420,13 @@ struct iscsi_boot_kobj *
 iscsi_boot_create_ethernet(struct iscsi_boot_kset *boot_kset, int index,
 			   void *data,
 			   ssize_t (*show) (void *data, int type, char *buf),
-			   mode_t (*is_visible) (void *data, int type))
+			   mode_t (*is_visible) (void *data, int type),
+			   void (*release) (void *data))
 {
 	return iscsi_boot_create_kobj(boot_kset,
 				      &iscsi_boot_ethernet_attr_group,
 				      "ethernet%d", index, data, show,
-				      is_visible);
+				      is_visible, release);
 }
 EXPORT_SYMBOL_GPL(iscsi_boot_create_ethernet);
 
diff --git a/include/linux/iscsi_boot_sysfs.h b/include/linux/iscsi_boot_sysfs.h
index f1e6c18..f0a2f8b 100644
--- a/include/linux/iscsi_boot_sysfs.h
+++ b/include/linux/iscsi_boot_sysfs.h
@@ -92,6 +92,13 @@ struct iscsi_boot_kobj {
 	 * properties.
 	 */
 	mode_t (*is_visible) (void *data, int type);
+
+	/*
+	 * Driver specific release function.
+	 *
+	 * The function should free the data passed in.
+	 */
+	void (*release) (void *data);
 };
 
 struct iscsi_boot_kset {
@@ -103,18 +110,21 @@ struct iscsi_boot_kobj *
 iscsi_boot_create_initiator(struct iscsi_boot_kset *boot_kset, int index,
 			    void *data,
 			    ssize_t (*show) (void *data, int type, char *buf),
-			    mode_t (*is_visible) (void *data, int type));
+			    mode_t (*is_visible) (void *data, int type),
+			    void (*release) (void *data));
 
 struct iscsi_boot_kobj *
 iscsi_boot_create_ethernet(struct iscsi_boot_kset *boot_kset, int index,
 			   void *data,
 			   ssize_t (*show) (void *data, int type, char *buf),
-			   mode_t (*is_visible) (void *data, int type));
+			   mode_t (*is_visible) (void *data, int type),
+			   void (*release) (void *data));
 struct iscsi_boot_kobj *
 iscsi_boot_create_target(struct iscsi_boot_kset *boot_kset, int index,
 			 void *data,
 			 ssize_t (*show) (void *data, int type, char *buf),
-			 mode_t (*is_visible) (void *data, int type));
+			 mode_t (*is_visible) (void *data, int type),
+			 void (*release) (void *data));
 
 struct iscsi_boot_kset *iscsi_boot_create_kset(const char *set_name);
 struct iscsi_boot_kset *iscsi_boot_create_host_kset(unsigned int hostno);