Merge tag 'efi-2022-01-rc1' of https://source.denx.de/u-boot/custodians/u-boot-efi

Pull request for efi-2022-01-rc1

Documentation:
	Use Sphinx 3.43.
	Move system reset documentation to HTML

UEFI:
	Fix linking EFI apps with LLVM
	Fix alignment of loaded image
	Correct simple network protocol test
	Code cleanup

10 files changed, 152 insertions, 191 deletions

diff --git a/lib/efi_driver/Makefile b/lib/efi_driver/Makefile
index 83baa1c9a4..f2b6c05cc2 100644
--- a/lib/efi_driver/Makefile
+++ b/lib/efi_driver/Makefile
@@ -6,6 +6,6 @@
 # object inclusion implicitly depends on it
 
 obj-y += efi_uclass.o
-ifeq ($(CONFIG_BLK)$(CONFIG_PARTITIONS),yy)
+ifeq ($(CONFIG_PARTITIONS),y)
 obj-y += efi_block_device.o
 endif
diff --git a/lib/efi_loader/Kconfig b/lib/efi_loader/Kconfig
index 83d584a60e..06633e90a1 100644
--- a/lib/efi_loader/Kconfig
+++ b/lib/efi_loader/Kconfig
@@ -11,6 +11,7 @@ config EFI_LOADER
 	# We need EFI_STUB_32BIT to be set on x86_32 with EFI_STUB
 	depends on !EFI_STUB || !X86 || X86_64 || EFI_STUB_32BIT
 	depends on BLK
+	depends on DM_ETH || !NET
 	default y if !ARM || SYS_CPU = armv7 || SYS_CPU = armv8
 	select LIB_UUID
 	select PARTITION_UUIDS
diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c
index cbdb466da4..c04439d16d 100644
--- a/lib/efi_loader/efi_device_path.c
+++ b/lib/efi_loader/efi_device_path.c
@@ -46,7 +46,7 @@ static const struct efi_device_path_vendor ROOT = {
 	.guid = U_BOOT_GUID,
 };
 
-#if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
+#if defined(CONFIG_MMC)
 /*
  * Determine if an MMC device is an SD card.
  *
@@ -486,7 +486,6 @@ bool efi_dp_is_multi_instance(const struct efi_device_path *dp)
 	return p->sub_type == DEVICE_PATH_SUB_TYPE_INSTANCE_END;
 }
 
-#ifdef CONFIG_DM
 /* size of device-path not including END node for device and all parents
  * up to the root device.
  */
@@ -503,7 +502,6 @@ __maybe_unused static unsigned int dp_size(struct udevice *dev)
 	case UCLASS_ETH:
 		return dp_size(dev->parent) +
 			sizeof(struct efi_device_path_mac_addr);
-#ifdef CONFIG_BLK
 	case UCLASS_BLK:
 		switch (dev->parent->uclass->uc_drv->id) {
 #ifdef CONFIG_IDE
@@ -511,12 +509,12 @@ __maybe_unused static unsigned int dp_size(struct udevice *dev)
 			return dp_size(dev->parent) +
 				sizeof(struct efi_device_path_atapi);
 #endif
-#if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI)
+#if defined(CONFIG_SCSI)
 		case UCLASS_SCSI:
 			return dp_size(dev->parent) +
 				sizeof(struct efi_device_path_scsi);
 #endif
-#if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
+#if defined(CONFIG_MMC)
 		case UCLASS_MMC:
 			return dp_size(dev->parent) +
 				sizeof(struct efi_device_path_sd_mmc_path);
@@ -554,8 +552,7 @@ __maybe_unused static unsigned int dp_size(struct udevice *dev)
 		default:
 			return dp_size(dev->parent);
 		}
-#endif
-#if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
+#if defined(CONFIG_MMC)
 	case UCLASS_MMC:
 		return dp_size(dev->parent) +
 			sizeof(struct efi_device_path_sd_mmc_path);
@@ -590,7 +587,7 @@ __maybe_unused static void *dp_fill(void *buf, struct udevice *dev)
 		*vdp = ROOT;
 		return &vdp[1];
 	}
-#ifdef CONFIG_DM_ETH
+#ifdef CONFIG_NET
 	case UCLASS_ETH: {
 		struct efi_device_path_mac_addr *dp =
 			dp_fill(buf, dev->parent);
@@ -607,7 +604,6 @@ __maybe_unused static void *dp_fill(void *buf, struct udevice *dev)
 		return &dp[1];
 	}
 #endif
-#ifdef CONFIG_BLK
 	case UCLASS_BLK:
 		switch (dev->parent->uclass->uc_drv->id) {
 #ifdef CONFIG_SANDBOX
@@ -662,7 +658,7 @@ __maybe_unused static void *dp_fill(void *buf, struct udevice *dev)
 			return &dp[1];
 			}
 #endif
-#if defined(CONFIG_SCSI) && defined(CONFIG_DM_SCSI)
+#if defined(CONFIG_SCSI)
 		case UCLASS_SCSI: {
 			struct efi_device_path_scsi *dp =
 				dp_fill(buf, dev->parent);
@@ -676,7 +672,7 @@ __maybe_unused static void *dp_fill(void *buf, struct udevice *dev)
 			return &dp[1];
 			}
 #endif
-#if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
+#if defined(CONFIG_MMC)
 		case UCLASS_MMC: {
 			struct efi_device_path_sd_mmc_path *sddp =
 				dp_fill(buf, dev->parent);
@@ -727,8 +723,7 @@ __maybe_unused static void *dp_fill(void *buf, struct udevice *dev)
 			      dev->name, dev->parent->uclass->uc_drv->id);
 			return dp_fill(buf, dev->parent);
 		}
-#endif
-#if defined(CONFIG_DM_MMC) && defined(CONFIG_MMC)
+#if defined(CONFIG_MMC)
 	case UCLASS_MMC: {
 		struct efi_device_path_sd_mmc_path *sddp =
 			dp_fill(buf, dev->parent);
@@ -770,24 +765,18 @@ __maybe_unused static void *dp_fill(void *buf, struct udevice *dev)
 		return dp_fill(buf, dev->parent);
 	}
 }
-#endif
 
 static unsigned dp_part_size(struct blk_desc *desc, int part)
 {
 	unsigned dpsize;
+	struct udevice *dev;
+	int ret;
 
-#ifdef CONFIG_BLK
-	{
-		struct udevice *dev;
-		int ret = blk_find_device(desc->if_type, desc->devnum, &dev);
+	ret = blk_find_device(desc->if_type, desc->devnum, &dev);
 
-		if (ret)
-			dev = desc->bdev->parent;
-		dpsize = dp_size(dev);
-	}
-#else
-	dpsize = sizeof(ROOT) + sizeof(struct efi_device_path_usb);
-#endif
+	if (ret)
+		dev = desc->bdev->parent;
+	dpsize = dp_size(dev);
 
 	if (part == 0) /* the actual disk, not a partition */
 		return dpsize;
@@ -877,36 +866,14 @@ static void *dp_part_node(void *buf, struct blk_desc *desc, int part)
  */
 static void *dp_part_fill(void *buf, struct blk_desc *desc, int part)
 {
-#ifdef CONFIG_BLK
-	{
-		struct udevice *dev;
-		int ret = blk_find_device(desc->if_type, desc->devnum, &dev);
+	struct udevice *dev;
+	int ret;
 
-		if (ret)
-			dev = desc->bdev->parent;
-		buf = dp_fill(buf, dev);
-	}
-#else
-	/*
-	 * We *could* make a more accurate path, by looking at if_type
-	 * and handling all the different cases like we do for non-
-	 * legacy (i.e. CONFIG_BLK=y) case. But most important thing
-	 * is just to have a unique device-path for if_type+devnum.
-	 * So map things to a fictitious USB device.
-	 */
-	struct efi_device_path_usb *udp;
-
-	memcpy(buf, &ROOT, sizeof(ROOT));
-	buf += sizeof(ROOT);
-
-	udp = buf;
-	udp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
-	udp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_USB;
-	udp->dp.length = sizeof(*udp);
-	udp->parent_port_number = desc->if_type;
-	udp->usb_interface = desc->devnum;
-	buf = &udp[1];
-#endif
+	ret = blk_find_device(desc->if_type, desc->devnum, &dev);
+
+	if (ret)
+		dev = desc->bdev->parent;
+	buf = dp_fill(buf, dev);
 
 	if (part == 0) /* the actual disk, not a partition */
 		return buf;
@@ -1051,39 +1018,18 @@ struct efi_device_path *efi_dp_from_uart(void)
 #ifdef CONFIG_NET
 struct efi_device_path *efi_dp_from_eth(void)
 {
-#ifndef CONFIG_DM_ETH
-	struct efi_device_path_mac_addr *ndp;
-#endif
 	void *buf, *start;
 	unsigned dpsize = 0;
 
 	assert(eth_get_dev());
 
-#ifdef CONFIG_DM_ETH
 	dpsize += dp_size(eth_get_dev());
-#else
-	dpsize += sizeof(ROOT);
-	dpsize += sizeof(*ndp);
-#endif
 
 	start = buf = dp_alloc(dpsize + sizeof(END));
 	if (!buf)
 		return NULL;
 
-#ifdef CONFIG_DM_ETH
 	buf = dp_fill(buf, eth_get_dev());
-#else
-	memcpy(buf, &ROOT, sizeof(ROOT));
-	buf += sizeof(ROOT);
-
-	ndp = buf;
-	ndp->dp.type = DEVICE_PATH_TYPE_MESSAGING_DEVICE;
-	ndp->dp.sub_type = DEVICE_PATH_SUB_TYPE_MSG_MAC_ADDR;
-	ndp->dp.length = sizeof(*ndp);
-	ndp->if_type = 1; /* Ethernet */
-	memcpy(ndp->mac.addr, eth_get_ethaddr(), ARP_HLEN);
-	buf = &ndp[1];
-#endif
 
 	*((struct efi_device_path *)buf) = END;
 
@@ -1263,7 +1209,6 @@ ssize_t efi_dp_check_length(const struct efi_device_path *dp,
  *                    initrd location
  *
  * @lo:		EFI_LOAD_OPTION containing a valid device path
- * @size:	size of the discovered device path
  * @guid:	guid to search for
  *
  * Return:
@@ -1272,7 +1217,7 @@ ssize_t efi_dp_check_length(const struct efi_device_path *dp,
  */
 struct
 efi_device_path *efi_dp_from_lo(struct efi_load_option *lo,
-				efi_uintn_t *size, efi_guid_t guid)
+				const efi_guid_t *guid)
 {
 	struct efi_device_path *fp = lo->file_path;
 	struct efi_device_path_vendor *vendor;
@@ -1287,8 +1232,8 @@ efi_device_path *efi_dp_from_lo(struct efi_load_option *lo,
 			continue;
 
 		vendor = (struct efi_device_path_vendor *)fp;
-		if (!guidcmp(&vendor->guid, &guid))
-			return efi_dp_dup(fp);
+		if (!guidcmp(&vendor->guid, guid))
+			return efi_dp_dup(efi_dp_next(fp));
 	}
 	log_debug("VenMedia(%pUl) not found in %ls\n", &guid, lo->label);
 
diff --git a/lib/efi_loader/efi_disk.c b/lib/efi_loader/efi_disk.c
index 988907ecb9..ef8b5c88ff 100644
--- a/lib/efi_loader/efi_disk.c
+++ b/lib/efi_loader/efi_disk.c
@@ -555,7 +555,6 @@ efi_status_t efi_disk_register(void)
 	struct efi_disk_obj *disk;
 	int disks = 0;
 	efi_status_t ret;
-#ifdef CONFIG_BLK
 	struct udevice *dev;
 
 	for (uclass_first_device_check(UCLASS_BLK, &dev); dev;
@@ -583,54 +582,7 @@ efi_status_t efi_disk_register(void)
 					&disk->header, desc, if_typename,
 					desc->devnum, dev->name);
 	}
-#else
-	int i, if_type;
 
-	/* Search for all available disk devices */
-	for (if_type = 0; if_type < IF_TYPE_COUNT; if_type++) {
-		const struct blk_driver *cur_drvr;
-		const char *if_typename;
-
-		cur_drvr = blk_driver_lookup_type(if_type);
-		if (!cur_drvr)
-			continue;
-
-		if_typename = cur_drvr->if_typename;
-		log_info("Scanning disks on %s...\n", if_typename);
-		for (i = 0; i < 4; i++) {
-			struct blk_desc *desc;
-			char devname[32] = { 0 }; /* dp->str is u16[32] long */
-
-			desc = blk_get_devnum_by_type(if_type, i);
-			if (!desc)
-				continue;
-			if (desc->type == DEV_TYPE_UNKNOWN)
-				continue;
-
-			snprintf(devname, sizeof(devname), "%s%d",
-				 if_typename, i);
-
-			/* Add block device for the full device */
-			ret = efi_disk_add_dev(NULL, NULL, if_typename, desc,
-					       i, NULL, 0, &disk);
-			if (ret == EFI_NOT_READY) {
-				log_notice("Disk %s not ready\n", devname);
-				continue;
-			}
-			if (ret) {
-				log_err("ERROR: failure to add disk device %s, r = %lu\n",
-					devname, ret & ~EFI_ERROR_MASK);
-				return ret;
-			}
-			disks++;
-
-			/* Partitions show up as block devices in EFI */
-			disks += efi_disk_create_partitions
-						(&disk->header, desc,
-						 if_typename, i, devname);
-		}
-	}
-#endif
 	log_info("Found %d disks\n", disks);
 
 	return EFI_SUCCESS;
diff --git a/lib/efi_loader/efi_helper.c b/lib/efi_loader/efi_helper.c
index d03a736461..b80a6e07df 100644
--- a/lib/efi_loader/efi_helper.c
+++ b/lib/efi_loader/efi_helper.c
@@ -13,6 +13,11 @@
 #include <efi_loader.h>
 #include <efi_variable.h>
 
+#if defined(CONFIG_CMD_EFIDEBUG) || defined(CONFIG_EFI_LOAD_FILE2_INITRD)
+/* GUID used by Linux to identify the LoadFile2 protocol with the initrd */
+const efi_guid_t efi_lf2_initrd_guid = EFI_INITRD_MEDIA_GUID;
+#endif
+
 /**
  * efi_create_current_boot_var() - Return Boot#### name were #### is replaced by
  *			           the value of BootCurrent
@@ -63,10 +68,8 @@ out:
  */
 struct efi_device_path *efi_get_dp_from_boot(const efi_guid_t guid)
 {
-	struct efi_device_path *file_path = NULL;
-	struct efi_device_path *tmp = NULL;
 	struct efi_load_option lo;
-	void *var_value = NULL;
+	void *var_value;
 	efi_uintn_t size;
 	efi_status_t ret;
 	u16 var_name[16];
@@ -81,18 +84,11 @@ struct efi_device_path *efi_get_dp_from_boot(const efi_guid_t guid)
 
 	ret = efi_deserialize_load_option(&lo, var_value, &size);
 	if (ret != EFI_SUCCESS)
-		goto out;
-
-	tmp = efi_dp_from_lo(&lo, &size, guid);
-	if (!tmp)
-		goto out;
+		goto err;
 
-	/* efi_dp_dup will just return NULL if efi_dp_next is NULL */
-	file_path = efi_dp_dup(efi_dp_next(tmp));
+	return efi_dp_from_lo(&lo, &guid);
 
-out:
-	efi_free_pool(tmp);
+err:
 	free(var_value);
-
-	return file_path;
+	return NULL;
 }
diff --git a/lib/efi_loader/efi_image_loader.c b/lib/efi_loader/efi_image_loader.c
index e9572d4d5d..eb95580538 100644
--- a/lib/efi_loader/efi_image_loader.c
+++ b/lib/efi_loader/efi_image_loader.c
@@ -898,9 +898,9 @@ efi_status_t efi_load_pe(struct efi_loaded_image_obj *handle,
 		image_base = opt->ImageBase;
 		efi_set_code_and_data_type(loaded_image_info, opt->Subsystem);
 		handle->image_type = opt->Subsystem;
-		virt_size = ALIGN(virt_size, opt->SectionAlignment);
-		efi_reloc = efi_alloc(virt_size,
-				      loaded_image_info->image_code_type);
+		efi_reloc = efi_alloc_aligned_pages(virt_size,
+						    loaded_image_info->image_code_type,
+						    opt->SectionAlignment);
 		if (!efi_reloc) {
 			log_err("Out of memory\n");
 			ret = EFI_OUT_OF_RESOURCES;
@@ -914,9 +914,9 @@ efi_status_t efi_load_pe(struct efi_loaded_image_obj *handle,
 		image_base = opt->ImageBase;
 		efi_set_code_and_data_type(loaded_image_info, opt->Subsystem);
 		handle->image_type = opt->Subsystem;
-		virt_size = ALIGN(virt_size, opt->SectionAlignment);
-		efi_reloc = efi_alloc(virt_size,
-				      loaded_image_info->image_code_type);
+		efi_reloc = efi_alloc_aligned_pages(virt_size,
+						    loaded_image_info->image_code_type,
+						    opt->SectionAlignment);
 		if (!efi_reloc) {
 			log_err("Out of memory\n");
 			ret = EFI_OUT_OF_RESOURCES;
diff --git a/lib/efi_loader/efi_load_initrd.c b/lib/efi_loader/efi_load_initrd.c
index e2a8063023..c5e6652e66 100644
--- a/lib/efi_loader/efi_load_initrd.c
+++ b/lib/efi_loader/efi_load_initrd.c
@@ -52,7 +52,6 @@ static efi_handle_t efi_initrd_handle;
  */
 static efi_status_t get_initrd_fp(struct efi_device_path **initrd_fp)
 {
-	const efi_guid_t lf2_initrd_guid = EFI_INITRD_MEDIA_GUID;
 	struct efi_device_path *dp = NULL;
 
 	/*
@@ -65,7 +64,7 @@ static efi_status_t get_initrd_fp(struct efi_device_path **initrd_fp)
 	 * We can then use this specific return value and not install the
 	 * protocol, while allowing the boot to continue
 	 */
-	dp = efi_get_dp_from_boot(lf2_initrd_guid);
+	dp = efi_get_dp_from_boot(efi_lf2_initrd_guid);
 	if (!dp)
 		return EFI_INVALID_PARAMETER;
 
diff --git a/lib/efi_loader/efi_memory.c b/lib/efi_loader/efi_memory.c
index f4acbee4f9..7f0b507281 100644
--- a/lib/efi_loader/efi_memory.c
+++ b/lib/efi_loader/efi_memory.c
@@ -550,6 +550,58 @@ efi_status_t efi_free_pages(uint64_t memory, efi_uintn_t pages)
 }
 
 /**
+ * efi_alloc_aligned_pages - allocate
+ *
+ * @len:		len in bytes
+ * @memory_type:	usage type of the allocated memory
+ * @align:		alignment in bytes
+ * Return:		aligned memory or NULL
+ */
+void *efi_alloc_aligned_pages(u64 len, int memory_type, size_t align)
+{
+	u64 req_pages = efi_size_in_pages(len);
+	u64 true_pages = req_pages + efi_size_in_pages(align) - 1;
+	u64 free_pages;
+	u64 aligned_mem;
+	efi_status_t r;
+	u64 mem;
+
+	/* align must be zero or a power of two */
+	if (align & (align - 1))
+		return NULL;
+
+	/* Check for overflow */
+	if (true_pages < req_pages)
+		return NULL;
+
+	if (align < EFI_PAGE_SIZE) {
+		r = efi_allocate_pages(EFI_ALLOCATE_ANY_PAGES, memory_type,
+				       req_pages, &mem);
+		return (r == EFI_SUCCESS) ? (void *)(uintptr_t)mem : NULL;
+	}
+
+	r = efi_allocate_pages(EFI_ALLOCATE_ANY_PAGES, memory_type,
+			       true_pages, &mem);
+	if (r != EFI_SUCCESS)
+		return NULL;
+
+	aligned_mem = ALIGN(mem, align);
+	/* Free pages before alignment */
+	free_pages = efi_size_in_pages(aligned_mem - mem);
+	if (free_pages)
+		efi_free_pages(mem, free_pages);
+
+	/* Free trailing pages */
+	free_pages = true_pages - (req_pages + free_pages);
+	if (free_pages) {
+		mem = aligned_mem + req_pages * EFI_PAGE_SIZE;
+		efi_free_pages(mem, free_pages);
+	}
+
+	return (void *)(uintptr_t)aligned_mem;
+}
+
+/**
  * efi_allocate_pool - allocate memory from pool
  *
  * @pool_type:	type of the pool from which memory is to be allocated
diff --git a/lib/efi_loader/efi_var_file.c b/lib/efi_loader/efi_var_file.c
index c7c6805ed0..76a2ff9e41 100644
--- a/lib/efi_loader/efi_var_file.c
+++ b/lib/efi_loader/efi_var_file.c
@@ -19,6 +19,13 @@
 
 #define PART_STR_LEN 10
 
+/* GUID used by Shim to store the MOK database */
+#define SHIM_LOCK_GUID \
+	EFI_GUID(0x605dab50, 0xe046, 0x4300, \
+		 0xab, 0xb6, 0x3d, 0xd8, 0x10, 0xdd, 0x8b, 0x23)
+
+static const efi_guid_t shim_lock_guid = SHIM_LOCK_GUID;
+
 /**
  * efi_set_blk_dev_to_system_partition() - select EFI system partition
  *
@@ -175,6 +182,7 @@ efi_status_t efi_var_restore(struct efi_var_file *buf, bool safe)
 		if (!safe &&
 		    (efi_auth_var_get_type(var->name, &var->guid) !=
 		     EFI_AUTH_VAR_NONE ||
+		     !guidcmp(&var->guid, &shim_lock_guid) ||
 		     !(var->attr & EFI_VARIABLE_NON_VOLATILE)))
 			continue;
 		if (!var->length)
diff --git a/lib/efi_selftest/efi_selftest_snp.c b/lib/efi_selftest/efi_selftest_snp.c
index 79f0467803..818cbfcacd 100644
--- a/lib/efi_selftest/efi_selftest_snp.c
+++ b/lib/efi_selftest/efi_selftest_snp.c
@@ -309,6 +309,18 @@ static int execute(void)
 		return EFI_ST_FAILURE;
 	}
 
+	/* Check media connected */
+	ret = net->get_status(net, NULL, NULL);
+	if (ret != EFI_SUCCESS) {
+		efi_st_error("Failed to get status");
+		return EFI_ST_FAILURE;
+	}
+	if (net->mode && net->mode->media_present_supported &&
+	    !net->mode->media_present) {
+		efi_st_error("Network media is not connected");
+		return EFI_ST_FAILURE;
+	}
+
 	/*
 	 * Send DHCP discover message
 	 */
@@ -328,8 +340,6 @@ static int execute(void)
 	events[0] = timer;
 	events[1] = net->wait_for_packet;
 	for (;;) {
-		u32 int_status;
-
 		/*
 		 * Wait for packet to be received or timer event.
 		 */
@@ -352,48 +362,46 @@ static int execute(void)
 			continue;
 		}
 		/*
-		 * Receive packet
+		 * Receive packets until buffer is empty
 		 */
-		buffer_size = sizeof(buffer);
-		ret = net->get_status(net, &int_status, NULL);
-		if (ret != EFI_SUCCESS) {
-			efi_st_error("Failed to get status");
-			return EFI_ST_FAILURE;
-		}
-		if (!(int_status & EFI_SIMPLE_NETWORK_RECEIVE_INTERRUPT)) {
-			efi_st_error("RX interrupt not set");
-			return EFI_ST_FAILURE;
-		}
-		ret = net->receive(net, NULL, &buffer_size, &buffer,
-				   &srcaddr, &destaddr, NULL);
-		if (ret != EFI_SUCCESS) {
-			efi_st_error("Failed to receive packet");
-			return EFI_ST_FAILURE;
+		for (;;) {
+			buffer_size = sizeof(buffer);
+			ret = net->receive(net, NULL, &buffer_size, &buffer,
+					   &srcaddr, &destaddr, NULL);
+			if (ret == EFI_NOT_READY) {
+				/* The received buffer is empty. */
+				break;
+			}
+
+			if (ret != EFI_SUCCESS) {
+				efi_st_error("Failed to receive packet");
+				return EFI_ST_FAILURE;
+			}
+			/*
+			 * Check the packet is meant for this system.
+			 * Unfortunately QEMU ignores the broadcast flag.
+			 * So we have to check for broadcasts too.
+			 */
+			if (memcmp(&destaddr, &net->mode->current_address, ARP_HLEN) &&
+			    memcmp(&destaddr, BROADCAST_MAC, ARP_HLEN))
+				continue;
+			/*
+			 * Check this is a DHCP reply
+			 */
+			if (buffer.p.eth_hdr.et_protlen != ntohs(PROT_IP) ||
+			    buffer.p.ip_udp.ip_hl_v != 0x45 ||
+			    buffer.p.ip_udp.ip_p != IPPROTO_UDP ||
+			    buffer.p.ip_udp.udp_src != ntohs(67) ||
+			    buffer.p.ip_udp.udp_dst != ntohs(68) ||
+			    buffer.p.dhcp_hdr.op != BOOTREPLY)
+				continue;
+			/*
+			 * We successfully received a DHCP reply.
+			 */
+			goto received;
 		}
-		/*
-		 * Check the packet is meant for this system.
-		 * Unfortunately QEMU ignores the broadcast flag.
-		 * So we have to check for broadcasts too.
-		 */
-		if (memcmp(&destaddr, &net->mode->current_address, ARP_HLEN) &&
-		    memcmp(&destaddr, BROADCAST_MAC, ARP_HLEN))
-			continue;
-		/*
-		 * Check this is a DHCP reply
-		 */
-		if (buffer.p.eth_hdr.et_protlen != ntohs(PROT_IP) ||
-		    buffer.p.ip_udp.ip_hl_v != 0x45 ||
-		    buffer.p.ip_udp.ip_p != IPPROTO_UDP ||
-		    buffer.p.ip_udp.udp_src != ntohs(67) ||
-		    buffer.p.ip_udp.udp_dst != ntohs(68) ||
-		    buffer.p.dhcp_hdr.op != BOOTREPLY)
-			continue;
-		/*
-		 * We successfully received a DHCP reply.
-		 */
-		break;
 	}
-
+received:
 	/*
 	 * Write a log message.
 	 */