diff options
Diffstat (limited to 'target/linux/generic/pending-6.1/401-mtd-don-t-register-NVMEM-devices-for-partitions-with.patch')
| -rw-r--r-- | target/linux/generic/pending-6.1/401-mtd-don-t-register-NVMEM-devices-for-partitions-with.patch | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/target/linux/generic/pending-6.1/401-mtd-don-t-register-NVMEM-devices-for-partitions-with.patch b/target/linux/generic/pending-6.1/401-mtd-don-t-register-NVMEM-devices-for-partitions-with.patch new file mode 100644 index 0000000000..42b5a564b1 --- /dev/null +++ b/target/linux/generic/pending-6.1/401-mtd-don-t-register-NVMEM-devices-for-partitions-with.patch @@ -0,0 +1,48 @@ +From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl> +Date: Tue, 31 Oct 2023 15:51:01 +0100 +Subject: [PATCH] mtd: don't register NVMEM devices for partitions with custom + drivers +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +This fixes issue exposed by upstream commit f4cf4e5db331 ("Revert +"nvmem: add new config option""). + +Signed-off-by: Rafał Miłecki <rafal@milecki.pl> +--- + drivers/mtd/mtdcore.c | 23 +++++++++++++++++++++++ + 1 file changed, 23 insertions(+) + +--- a/drivers/mtd/mtdcore.c ++++ b/drivers/mtd/mtdcore.c +@@ -519,6 +519,29 @@ static int mtd_nvmem_add(struct mtd_info + struct device_node *node = mtd_get_of_node(mtd); + struct nvmem_config config = {}; + ++ /* ++ * Do NOT register NVMEM device for any partition that is meant to be ++ * handled by a U-Boot env driver. That would result in associating two ++ * different NVMEM devices with the same OF node. ++ * ++ * An example of unwanted behaviour of above (forwardtrace): ++ * of_get_mac_addr_nvmem() ++ * of_nvmem_cell_get() ++ * __nvmem_device_get() ++ * ++ * We can't have __nvmem_device_get() return "mtdX" NVMEM device instead ++ * of U-Boot env NVMEM device. That would result in failing to find ++ * NVMEM cell. ++ * ++ * This issue seems to affect U-Boot env case only and will go away with ++ * switch to NVMEM layouts. ++ */ ++ if (of_device_is_compatible(node, "u-boot,env") || ++ of_device_is_compatible(node, "u-boot,env-redundant-bool") || ++ of_device_is_compatible(node, "u-boot,env-redundant-count") || ++ of_device_is_compatible(node, "brcm,env")) ++ return 0; ++ + config.id = -1; + config.dev = &mtd->dev; + config.name = dev_name(&mtd->dev); |