| Message ID | 20210413163700.12215-1-zajec5@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | mtd: parsers: trx: parse "firmware" MTD partitions only | expand |
Hi Rafał, Rafał Miłecki <zajec5@gmail.com> wrote on Tue, 13 Apr 2021 18:37:00 +0200: > From: Rafał Miłecki <rafal@milecki.pl> > > Parsing every partition with "compatible" set to "brcm,trx" results in > parsing both: firmware partition and failsafe partition on devices that > implement failsafe booting. This affects e.g. Linksys EA9500 which has: > > partition@200000 { > reg = <0x0200000 0x01d00000>; > compatible = "linksys,ns-firmware", "brcm,trx"; > }; > > partition@1f00000 { > reg = <0x01f00000 0x01d00000>; > compatible = "linksys,ns-firmware", "brcm,trx"; > }; > > Check for MTD partition name "firmware" before parsing. Recently added > ofpart_linksys_ns.c creates "firmware" and "failsafe" depending on > bootloader setup. I don't like very much the matching against a partition name, this is and should probably remain free text. Why not matching against the entire linksys,ns-firmware compatible instead? > > Signed-off-by: Rafał Miłecki <rafal@milecki.pl> > --- > Vivek has recently reported this problem to me and this is soltuion I > came up with. > > One alternative I thought of could be marking "failsafe" MTD partition > node as disabled (using of_update_property() + "status" + "disabled") and > then using of_device_is_available() in the parser_trx.c. > > Let me know if you prefer the other (or any other) solution over this > patch. > --- > drivers/mtd/parsers/parser_trx.c | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/drivers/mtd/parsers/parser_trx.c b/drivers/mtd/parsers/parser_trx.c > index 8541182134d4..0063791e164d 100644 > --- a/drivers/mtd/parsers/parser_trx.c > +++ b/drivers/mtd/parsers/parser_trx.c > @@ -58,6 +58,10 @@ static int parser_trx_parse(struct mtd_info *mtd, > uint8_t curr_part = 0, i = 0; > int err; > > + /* Don't parse any failsafe / backup partitions */ > + if (strcmp(mtd->name, "firmware")) > + return -EINVAL; > + > parts = kcalloc(TRX_PARSER_MAX_PARTS, sizeof(struct mtd_partition), > GFP_KERNEL); > if (!parts) Thanks, Miquèl
diff --git a/drivers/mtd/parsers/parser_trx.c b/drivers/mtd/parsers/parser_trx.c index 8541182134d4..0063791e164d 100644 --- a/drivers/mtd/parsers/parser_trx.c +++ b/drivers/mtd/parsers/parser_trx.c @@ -58,6 +58,10 @@ static int parser_trx_parse(struct mtd_info *mtd, uint8_t curr_part = 0, i = 0; int err; + /* Don't parse any failsafe / backup partitions */ + if (strcmp(mtd->name, "firmware")) + return -EINVAL; + parts = kcalloc(TRX_PARSER_MAX_PARTS, sizeof(struct mtd_partition), GFP_KERNEL); if (!parts)