From f19171c919e03c2590dce2f5026de2bf43203f7c Mon Sep 17 00:00:00 2001 From: Ilias Apalodimas Date: Mon, 8 Jan 2024 10:55:33 +0200 Subject: efi_loader: Clean up efi_dp_append and efi_dp_concat Looking back at the initrd storing functionality, we introduced three functions, efi_dp_append_or_concatenate(), efi_dp_append/concat(). In hindsight we could have simplified that by a lot. First of all none of the functions append anything. They all allocate a new device path and concatenate the contents of two device paths in one. A boolean parameter controls the final device path -- if that's true an end node is injected between the two device paths. So let's rewrite this and make it a bit easier to read. Get rid of efi_dp_append(), efi_dp_concat() and rename efi_dp_append_or_concatenate() to efi_dp_concat(). This is far more intuitive and the only adjustment that is needed is an extra boolean argument on all callsites. Signed-off-by: Ilias Apalodimas --- lib/efi_loader/efi_device_path.c | 70 ++++++++++++---------------------------- 1 file changed, 21 insertions(+), 49 deletions(-) (limited to 'lib/efi_loader/efi_device_path.c') diff --git a/lib/efi_loader/efi_device_path.c b/lib/efi_loader/efi_device_path.c index 8dbd8105ae2..500fa10d405 100644 --- a/lib/efi_loader/efi_device_path.c +++ b/lib/efi_loader/efi_device_path.c @@ -271,30 +271,27 @@ struct efi_device_path *efi_dp_dup(const struct efi_device_path *dp) } /** - * efi_dp_append_or_concatenate() - Append or concatenate two device paths. - * Concatenated device path will be separated - * by a sub-type 0xff end node + * efi_dp_concat() - Concatenate two device paths and add and terminate them + * with an end node. * - * @dp1: First device path - * @dp2: Second device path - * @concat: If true the two device paths will be concatenated and separated - * by an end of entrire device path sub-type 0xff end node. - * If true the second device path will be appended to the first and - * terminated by an end node + * @dp1: First device path + * @dp2: Second device path + * @split_end_node: If true the two device paths will be concatenated and + * separated by an end node (DEVICE_PATH_SUB_TYPE_END). + * If false the second device path will be concatenated to the + * first one as-is. * * Return: * concatenated device path or NULL. Caller must free the returned value */ -static struct -efi_device_path *efi_dp_append_or_concatenate(const struct efi_device_path *dp1, - const struct efi_device_path *dp2, - bool concat) +struct +efi_device_path *efi_dp_concat(const struct efi_device_path *dp1, + const struct efi_device_path *dp2, + bool split_end_node) { struct efi_device_path *ret; - size_t end_size = sizeof(END); + size_t end_size; - if (concat) - end_size = 2 * sizeof(END); if (!dp1 && !dp2) { /* return an end node */ ret = efi_dp_dup(&END); @@ -306,14 +303,20 @@ efi_device_path *efi_dp_append_or_concatenate(const struct efi_device_path *dp1, /* both dp1 and dp2 are non-null */ unsigned sz1 = efi_dp_size(dp1); unsigned sz2 = efi_dp_size(dp2); - void *p = efi_alloc(sz1 + sz2 + end_size); + void *p; + + if (split_end_node) + end_size = 2 * sizeof(END); + else + end_size = sizeof(END); + p = efi_alloc(sz1 + sz2 + end_size); if (!p) return NULL; ret = p; memcpy(p, dp1, sz1); p += sz1; - if (concat) { + if (split_end_node) { memcpy(p, &END, sizeof(END)); p += sizeof(END); } @@ -327,37 +330,6 @@ efi_device_path *efi_dp_append_or_concatenate(const struct efi_device_path *dp1, return ret; } -/** - * efi_dp_append() - Append a device to an existing device path. - * - * @dp1: First device path - * @dp2: Second device path - * - * Return: - * concatenated device path or NULL. Caller must free the returned value - */ -struct efi_device_path *efi_dp_append(const struct efi_device_path *dp1, - const struct efi_device_path *dp2) -{ - return efi_dp_append_or_concatenate(dp1, dp2, false); -} - -/** - * efi_dp_concat() - Concatenate 2 device paths. The final device path will - * contain two device paths separated by and end node (0xff). - * - * @dp1: First device path - * @dp2: Second device path - * - * Return: - * concatenated device path or NULL. Caller must free the returned value - */ -struct efi_device_path *efi_dp_concat(const struct efi_device_path *dp1, - const struct efi_device_path *dp2) -{ - return efi_dp_append_or_concatenate(dp1, dp2, true); -} - struct efi_device_path *efi_dp_append_node(const struct efi_device_path *dp, const struct efi_device_path *node) { -- cgit v1.2.3