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authorBrian Norris <computersforpeace@gmail.com>2015-10-11 20:03:47 (GMT)
committerBrian Norris <computersforpeace@gmail.com>2015-10-27 01:43:48 (GMT)
commit5a2415b0769233194f20d3906c3ffc6a2033317c (patch)
tree355fb4bd34fa3b04832e80c7b7f3250d4f65dac5 /drivers/mtd
parent04850c4d8613127a9b488321c0ad83bff7519311 (diff)
downloadlinux-5a2415b0769233194f20d3906c3ffc6a2033317c.tar.xz
mtd: mtdpart: Do not fail mtd probe when parsing partitions fails
Due to wrong assumption in ofpart ofpart fails on Exynos on SPI chips with no partitions because the subnode containing controller data confuses the ofpart parser. Thus compiling in ofpart support automatically fails probing any SPI NOR flash without partitions on Exynos. Compiling in a partitioning scheme should not cause probe of otherwise valid device to fail. Instead, let's do the following: * try parsers until one succeeds * if no parser succeeds, report the first error we saw * even in the failure case, allow MTD to probe, with fallback partitions or no partitions at all -- the master device will still be registered Issue report and comments initially by Michal Suchanek. Reported-by: Michal Suchanek <hramrach@gmail.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/mtdcore.c6
-rw-r--r--drivers/mtd/mtdpart.c14
2 files changed, 14 insertions, 6 deletions
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 41dc501..b1eea48 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -598,8 +598,10 @@ int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types,
}
/* Didn't come up with either parsed OR fallback partitions */
if (ret < 0) {
- pr_info("mtd: failed to find partitions\n");
- goto out;
+ pr_info("mtd: failed to find partitions; one or more parsers reports errors (%d)\n",
+ ret);
+ /* Don't abort on errors; we can still use unpartitioned MTD */
+ ret = 0;
}
ret = mtd_add_device_partitions(mtd, real_parts, ret);
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index f5279ea..f8ba153 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -755,12 +755,12 @@ int parse_mtd_partitions(struct mtd_info *master, const char *const *types,
struct mtd_part_parser_data *data)
{
struct mtd_part_parser *parser;
- int ret = 0;
+ int ret, err = 0;
if (!types)
types = default_mtd_part_types;
- for ( ; ret <= 0 && *types; types++) {
+ for ( ; *types; types++) {
pr_debug("%s: parsing partitions %s\n", master->name, *types);
parser = get_partition_parser(*types);
if (!parser && !request_module("%s", *types))
@@ -776,10 +776,16 @@ int parse_mtd_partitions(struct mtd_info *master, const char *const *types,
if (ret > 0) {
printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n",
ret, parser->name, master->name);
- break;
+ return ret;
}
+ /*
+ * Stash the first error we see; only report it if no parser
+ * succeeds
+ */
+ if (ret < 0 && !err)
+ err = ret;
}
- return ret;
+ return err;
}
int mtd_is_partition(const struct mtd_info *mtd)