Re: [PATCH] lightnvm: propagate device_add() error code
On 09/15/2016 05:53 PM, Arnd Bergmann wrote: device_add() may fail, and all callers are supposed to check the return value, but one new user in lightnvm doesn't: drivers/lightnvm/sysfs.c: In function 'nvm_sysfs_register_dev': drivers/lightnvm/sysfs.c:184:2: error: ignoring return value of 'device_add', declared with attribute warn_unused_result [-Werror=unused-result] This changes the caller to propagate any error codes, which avoids the warning. Signed-off-by: Arnd BergmannFixes: 38c9e260b9f9 ("lightnvm: expose device geometry through sysfs") --- drivers/lightnvm/lightnvm.h | 2 +- drivers/lightnvm/sysfs.c| 9 ++--- 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/lightnvm/lightnvm.h b/drivers/lightnvm/lightnvm.h index 93f1aacc9f02..305c181509a6 100644 --- a/drivers/lightnvm/lightnvm.h +++ b/drivers/lightnvm/lightnvm.h @@ -24,7 +24,7 @@ #include /* core -> sysfs.c */ -int nvm_sysfs_register_dev(struct nvm_dev *); +int __must_check nvm_sysfs_register_dev(struct nvm_dev *); void nvm_sysfs_unregister_dev(struct nvm_dev *); int nvm_sysfs_register(void); void nvm_sysfs_unregister(void); diff --git a/drivers/lightnvm/sysfs.c b/drivers/lightnvm/sysfs.c index 72ad089c0269..0338c27ab95a 100644 --- a/drivers/lightnvm/sysfs.c +++ b/drivers/lightnvm/sysfs.c @@ -174,6 +174,8 @@ static struct device_type nvm_type = { int nvm_sysfs_register_dev(struct nvm_dev *dev) { + int ret; + if (!dev->parent_dev) return 0; @@ -181,11 +183,12 @@ int nvm_sysfs_register_dev(struct nvm_dev *dev) dev_set_name(>dev, "%s", dev->name); dev->dev.type = _type; device_initialize(>dev); - device_add(>dev); + ret = device_add(>dev); - blk_mq_register_dev(>dev, dev->q); + if (!ret) + blk_mq_register_dev(>dev, dev->q); - return 0; + return ret; } void nvm_sysfs_unregister_dev(struct nvm_dev *dev) Thans Arnd. Applied for 4.9.
Re: [PATCH] lightnvm: propagate device_add() error code
On 09/15/2016 05:53 PM, Arnd Bergmann wrote: device_add() may fail, and all callers are supposed to check the return value, but one new user in lightnvm doesn't: drivers/lightnvm/sysfs.c: In function 'nvm_sysfs_register_dev': drivers/lightnvm/sysfs.c:184:2: error: ignoring return value of 'device_add', declared with attribute warn_unused_result [-Werror=unused-result] This changes the caller to propagate any error codes, which avoids the warning. Signed-off-by: Arnd Bergmann Fixes: 38c9e260b9f9 ("lightnvm: expose device geometry through sysfs") --- drivers/lightnvm/lightnvm.h | 2 +- drivers/lightnvm/sysfs.c| 9 ++--- 2 files changed, 7 insertions(+), 4 deletions(-) diff --git a/drivers/lightnvm/lightnvm.h b/drivers/lightnvm/lightnvm.h index 93f1aacc9f02..305c181509a6 100644 --- a/drivers/lightnvm/lightnvm.h +++ b/drivers/lightnvm/lightnvm.h @@ -24,7 +24,7 @@ #include /* core -> sysfs.c */ -int nvm_sysfs_register_dev(struct nvm_dev *); +int __must_check nvm_sysfs_register_dev(struct nvm_dev *); void nvm_sysfs_unregister_dev(struct nvm_dev *); int nvm_sysfs_register(void); void nvm_sysfs_unregister(void); diff --git a/drivers/lightnvm/sysfs.c b/drivers/lightnvm/sysfs.c index 72ad089c0269..0338c27ab95a 100644 --- a/drivers/lightnvm/sysfs.c +++ b/drivers/lightnvm/sysfs.c @@ -174,6 +174,8 @@ static struct device_type nvm_type = { int nvm_sysfs_register_dev(struct nvm_dev *dev) { + int ret; + if (!dev->parent_dev) return 0; @@ -181,11 +183,12 @@ int nvm_sysfs_register_dev(struct nvm_dev *dev) dev_set_name(>dev, "%s", dev->name); dev->dev.type = _type; device_initialize(>dev); - device_add(>dev); + ret = device_add(>dev); - blk_mq_register_dev(>dev, dev->q); + if (!ret) + blk_mq_register_dev(>dev, dev->q); - return 0; + return ret; } void nvm_sysfs_unregister_dev(struct nvm_dev *dev) Thans Arnd. Applied for 4.9.