Commit c048b60d39e1 ("mtd: core: provide unique name for nvmem device") tries to give the nvmem device a unique name, but fails badly if the mtd device doesn't have a "struct device" associated with it, i.e. if CONFIG_MTD_PARTITIONED_MASTER is not set. This will result in the name "(null)-user-otp", which is not unique. It seems the best we can do is to use the compatible name together with a unique identifier added by the nvmem subsystem by using NVMEM_DEVID_AUTO.
Fixes: c048b60d39e1 ("mtd: core: provide unique name for nvmem device") Cc: stable@vger.kernel.org Signed-off-by: Michael Walle michael@walle.cc --- v2: - actually use NVMEM_DEVID_AUTO as described in the commit message
drivers/mtd/mtdcore.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 0feacb9fbdac..8fc66cda4a09 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -888,8 +888,8 @@ static struct nvmem_device *mtd_otp_nvmem_register(struct mtd_info *mtd,
/* OTP nvmem will be registered on the physical device */ config.dev = mtd->dev.parent; - config.name = kasprintf(GFP_KERNEL, "%s-%s", dev_name(&mtd->dev), compatible); - config.id = NVMEM_DEVID_NONE; + config.name = compatible; + config.id = NVMEM_DEVID_AUTO; config.owner = THIS_MODULE; config.type = NVMEM_TYPE_OTP; config.root_only = true; @@ -905,7 +905,6 @@ static struct nvmem_device *mtd_otp_nvmem_register(struct mtd_info *mtd, nvmem = NULL;
of_node_put(np); - kfree(config.name);
return nvmem; }
The master MTD will only have an associated device if CONFIG_MTD_PARTITIONED_MASTER is set, thus we cannot use dev_err() on mtd->dev. Instead use the parent device which is the physical flash memory.
Fixes: 4b361cfa8624 ("mtd: core: add OTP nvmem provider support") Cc: stable@vger.kernel.org Signed-off-by: Michael Walle michael@walle.cc --- v2: - none
drivers/mtd/mtdcore.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 8fc66cda4a09..c38a13cb8d5e 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -939,6 +939,7 @@ static int mtd_nvmem_fact_otp_reg_read(void *priv, unsigned int offset,
static int mtd_otp_nvmem_add(struct mtd_info *mtd) { + struct device *dev = mtd->dev.parent; struct nvmem_device *nvmem; ssize_t size; int err; @@ -952,7 +953,7 @@ static int mtd_otp_nvmem_add(struct mtd_info *mtd) nvmem = mtd_otp_nvmem_register(mtd, "user-otp", size, mtd_nvmem_user_otp_reg_read); if (IS_ERR(nvmem)) { - dev_err(&mtd->dev, "Failed to register OTP NVMEM device\n"); + dev_err(dev, "Failed to register OTP NVMEM device\n"); return PTR_ERR(nvmem); } mtd->otp_user_nvmem = nvmem; @@ -970,7 +971,7 @@ static int mtd_otp_nvmem_add(struct mtd_info *mtd) nvmem = mtd_otp_nvmem_register(mtd, "factory-otp", size, mtd_nvmem_fact_otp_reg_read); if (IS_ERR(nvmem)) { - dev_err(&mtd->dev, "Failed to register OTP NVMEM device\n"); + dev_err(dev, "Failed to register OTP NVMEM device\n"); err = PTR_ERR(nvmem); goto err; }
If mtd_otp_nvmem_add() fails, the partitions won't be removed because there is simply no call to del_mtd_partitions(). Unfortunately, add_mtd_partitions() will print all partitions to the kernel console. If mtd_otp_nvmem_add() returns -EPROBE_DEFER this would print the partitions multiple times to the kernel console. Instead move mtd_otp_nvmem_add() to the beginning of the function.
Fixes: 4b361cfa8624 ("mtd: core: add OTP nvmem provider support") Cc: stable@vger.kernel.org Signed-off-by: Michael Walle michael@walle.cc --- v2: - none
drivers/mtd/mtdcore.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index c38a13cb8d5e..0bc9676fe029 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -1023,10 +1023,14 @@ int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types,
mtd_set_dev_defaults(mtd);
+ ret = mtd_otp_nvmem_add(mtd); + if (ret) + goto out; + if (IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER)) { ret = add_mtd_device(mtd); if (ret) - return ret; + goto out; }
/* Prefer parsed partitions over driver-provided fallback */ @@ -1061,9 +1065,12 @@ int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types, register_reboot_notifier(&mtd->reboot_notifier); }
- ret = mtd_otp_nvmem_add(mtd); - out: + if (ret) { + nvmem_unregister(mtd->otp_user_nvmem); + nvmem_unregister(mtd->otp_factory_nvmem); + } + if (ret && device_is_registered(&mtd->dev)) del_mtd_device(mtd);
Hi Michael,
michael@walle.cc wrote on Wed, 8 Mar 2023 09:20:18 +0100:
Commit c048b60d39e1 ("mtd: core: provide unique name for nvmem device") tries to give the nvmem device a unique name, but fails badly if the mtd device doesn't have a "struct device" associated with it, i.e. if CONFIG_MTD_PARTITIONED_MASTER is not set. This will result in the name "(null)-user-otp", which is not unique. It seems the best we can do is to use the compatible name together with a unique identifier added by the nvmem subsystem by using NVMEM_DEVID_AUTO.
Fixes: c048b60d39e1 ("mtd: core: provide unique name for nvmem device") Cc: stable@vger.kernel.org Signed-off-by: Michael Walle michael@walle.cc
v2:
- actually use NVMEM_DEVID_AUTO as described in the commit message
Thanks for the v2, as I want to share a clean immutable branch with Greg, I made an exception in force pushing this patch in place of its v1 counterpart.
drivers/mtd/mtdcore.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index 0feacb9fbdac..8fc66cda4a09 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -888,8 +888,8 @@ static struct nvmem_device *mtd_otp_nvmem_register(struct mtd_info *mtd, /* OTP nvmem will be registered on the physical device */ config.dev = mtd->dev.parent;
- config.name = kasprintf(GFP_KERNEL, "%s-%s", dev_name(&mtd->dev), compatible);
- config.id = NVMEM_DEVID_NONE;
- config.name = compatible;
- config.id = NVMEM_DEVID_AUTO; config.owner = THIS_MODULE; config.type = NVMEM_TYPE_OTP; config.root_only = true;
@@ -905,7 +905,6 @@ static struct nvmem_device *mtd_otp_nvmem_register(struct mtd_info *mtd, nvmem = NULL; of_node_put(np);
- kfree(config.name);
return nvmem; }
Thanks, Miquèl
linux-stable-mirror@lists.linaro.org
-
Michael Walle -
Miquel Raynal