diff options
Diffstat (limited to 'target/linux/generic/backport-4.9/068-v4.18-0001-mtd-move-code-adding-registering-partitions-to-the-p.patch')
| -rw-r--r-- | target/linux/generic/backport-4.9/068-v4.18-0001-mtd-move-code-adding-registering-partitions-to-the-p.patch | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/target/linux/generic/backport-4.9/068-v4.18-0001-mtd-move-code-adding-registering-partitions-to-the-p.patch b/target/linux/generic/backport-4.9/068-v4.18-0001-mtd-move-code-adding-registering-partitions-to-the-p.patch new file mode 100644 index 0000000000..29aa3b9e8d --- /dev/null +++ b/target/linux/generic/backport-4.9/068-v4.18-0001-mtd-move-code-adding-registering-partitions-to-the-p.patch @@ -0,0 +1,168 @@ +From 5ac67ce36cfe38b4c104a42ce52c5c8d526f1c95 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl> +Date: Tue, 27 Mar 2018 22:35:41 +0200 +Subject: [PATCH] mtd: move code adding (registering) partitions to the + parse_mtd_partitions() +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +This commit slightly simplifies the code. Every parse_mtd_partitions() +caller (out of two existing ones) had to add partitions & cleanup parser +on its own. This moves that responsibility into the function. + +That change also allows dropping struct mtd_partitions argument. + +There is one minor behavior change caused by this cleanup. If +parse_mtd_partitions() fails to add partitions (add_mtd_partitions() +return an error) then mtd_device_parse_register() will still try to +add (register) fallback partitions. It's a real corner case affecting +one of uncommon error paths and shouldn't cause any harm. + +Signed-off-by: Rafał Miłecki <rafal@milecki.pl> +Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com> +--- + drivers/mtd/mtdcore.c | 14 ++++---------- + drivers/mtd/mtdcore.h | 1 - + drivers/mtd/mtdpart.c | 44 ++++++++++++++++---------------------------- + 3 files changed, 20 insertions(+), 39 deletions(-) + +--- a/drivers/mtd/mtdcore.c ++++ b/drivers/mtd/mtdcore.c +@@ -676,7 +676,6 @@ int mtd_device_parse_register(struct mtd + const struct mtd_partition *parts, + int nr_parts) + { +- struct mtd_partitions parsed = { }; + int ret; + + mtd_set_dev_defaults(mtd); +@@ -688,13 +687,10 @@ int mtd_device_parse_register(struct mtd + } + + /* Prefer parsed partitions over driver-provided fallback */ +- ret = parse_mtd_partitions(mtd, types, &parsed, parser_data); +- if (!ret && parsed.nr_parts) { +- parts = parsed.parts; +- nr_parts = parsed.nr_parts; +- } +- +- if (nr_parts) ++ ret = parse_mtd_partitions(mtd, types, parser_data); ++ if (ret > 0) ++ ret = 0; ++ else if (nr_parts) + ret = add_mtd_partitions(mtd, parts, nr_parts); + else if (!device_is_registered(&mtd->dev)) + ret = add_mtd_device(mtd); +@@ -720,8 +716,6 @@ int mtd_device_parse_register(struct mtd + } + + out: +- /* Cleanup any parsed partitions */ +- mtd_part_parser_cleanup(&parsed); + if (ret && device_is_registered(&mtd->dev)) + del_mtd_device(mtd); + +--- a/drivers/mtd/mtdcore.h ++++ b/drivers/mtd/mtdcore.h +@@ -14,7 +14,6 @@ int del_mtd_partitions(struct mtd_info * + struct mtd_partitions; + + int parse_mtd_partitions(struct mtd_info *master, const char * const *types, +- struct mtd_partitions *pparts, + struct mtd_part_parser_data *data); + + void mtd_part_parser_cleanup(struct mtd_partitions *parts); +--- a/drivers/mtd/mtdpart.c ++++ b/drivers/mtd/mtdpart.c +@@ -383,20 +383,7 @@ static inline void free_partition(struct + */ + static int mtd_parse_part(struct mtd_part *slave, const char *const *types) + { +- struct mtd_partitions parsed; +- int err; +- +- err = parse_mtd_partitions(&slave->mtd, types, &parsed, NULL); +- if (err) +- return err; +- else if (!parsed.nr_parts) +- return -ENOENT; +- +- err = add_mtd_partitions(&slave->mtd, parsed.parts, parsed.nr_parts); +- +- mtd_part_parser_cleanup(&parsed); +- +- return err; ++ return parse_mtd_partitions(&slave->mtd, types, NULL); + } + + static struct mtd_part *allocate_partition(struct mtd_info *parent, +@@ -973,30 +960,27 @@ static int mtd_part_of_parse(struct mtd_ + } + + /** +- * parse_mtd_partitions - parse MTD partitions ++ * parse_mtd_partitions - parse and register MTD partitions ++ * + * @master: the master partition (describes whole MTD device) + * @types: names of partition parsers to try or %NULL +- * @pparts: info about partitions found is returned here + * @data: MTD partition parser-specific data + * +- * This function tries to find partition on MTD device @master. It uses MTD +- * partition parsers, specified in @types. However, if @types is %NULL, then +- * the default list of parsers is used. The default list contains only the ++ * This function tries to find & register partitions on MTD device @master. It ++ * uses MTD partition parsers, specified in @types. However, if @types is %NULL, ++ * then the default list of parsers is used. The default list contains only the + * "cmdlinepart" and "ofpart" parsers ATM. + * Note: If there are more then one parser in @types, the kernel only takes the + * partitions parsed out by the first parser. + * + * This function may return: + * o a negative error code in case of failure +- * o zero otherwise, and @pparts will describe the partitions, number of +- * partitions, and the parser which parsed them. Caller must release +- * resources with mtd_part_parser_cleanup() when finished with the returned +- * data. ++ * o number of found partitions otherwise + */ + int parse_mtd_partitions(struct mtd_info *master, const char *const *types, +- struct mtd_partitions *pparts, + struct mtd_part_parser_data *data) + { ++ struct mtd_partitions pparts = { }; + struct mtd_part_parser *parser; + int ret, err = 0; + +@@ -1010,7 +994,7 @@ int parse_mtd_partitions(struct mtd_info + * handled in a separated function. + */ + if (!strcmp(*types, "ofpart")) { +- ret = mtd_part_of_parse(master, pparts); ++ ret = mtd_part_of_parse(master, &pparts); + } else { + pr_debug("%s: parsing partitions %s\n", master->name, + *types); +@@ -1021,13 +1005,17 @@ int parse_mtd_partitions(struct mtd_info + parser ? parser->name : NULL); + if (!parser) + continue; +- ret = mtd_part_do_parse(parser, master, pparts, data); ++ ret = mtd_part_do_parse(parser, master, &pparts, data); + if (ret <= 0) + mtd_part_parser_put(parser); + } + /* Found partitions! */ +- if (ret > 0) +- return 0; ++ if (ret > 0) { ++ err = add_mtd_partitions(master, pparts.parts, ++ pparts.nr_parts); ++ mtd_part_parser_cleanup(&pparts); ++ return err ? err : pparts.nr_parts; ++ } + /* + * Stash the first error we see; only report it if no parser + * succeeds |