* [PATCH] fs: configfs: don't return anything from drop_link
[not found] <CGME20161128122258eucas1p2c3543f6795fe54c07175a5f5fbae0765@eucas1p2.samsung.com>
@ 2016-11-28 12:22 ` Andrzej Pietrasiewicz
2016-12-01 9:53 ` Christoph Hellwig
0 siblings, 1 reply; 2+ messages in thread
From: Andrzej Pietrasiewicz @ 2016-11-28 12:22 UTC (permalink / raw)
To: linux-usb, linux-nvme, linux-scsi, target-devel
Cc: Andrzej Pietrasiewicz, Felipe Balbi, Greg Kroah-Hartman,
Christoph Hellwig, Nicholas A. Bellinger, Laurent Pinchart,
Joel Becker, linux-doc, b.zolnierkie
Documentation/filesystems/configfs/configfs.txt says:
"When unlink(2) is called on the symbolic link, the source item is
notified via the ->drop_link() method. Like the ->drop_item() method,
this is a void function and cannot return failure."
The ->drop_item() is indeed a void function, the ->drop_link() is
actually not. This, together with the fact that the value of ->drop_link()
is silently ignored suggests, that it is the ->drop_link() return
type that should be corrected and changed to void.
This patch changes drop_link() signature and all its users.
Compile-tested only! It needs Tested-by from respective subsystems.
Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
---
Documentation/filesystems/configfs/configfs.txt | 2 +-
drivers/nvme/target/configfs.c | 46 ++++++++++---------------
drivers/target/target_core_fabric_configfs.c | 7 ++--
drivers/usb/gadget/configfs.c | 8 ++---
drivers/usb/gadget/function/uvc_configfs.c | 25 +++-----------
include/linux/configfs.h | 2 +-
6 files changed, 31 insertions(+), 59 deletions(-)
diff --git a/Documentation/filesystems/configfs/configfs.txt b/Documentation/filesystems/configfs/configfs.txt
index 8ec9136..3828e85 100644
--- a/Documentation/filesystems/configfs/configfs.txt
+++ b/Documentation/filesystems/configfs/configfs.txt
@@ -174,7 +174,7 @@ among other things. For that, it needs a type.
void (*release)(struct config_item *);
int (*allow_link)(struct config_item *src,
struct config_item *target);
- int (*drop_link)(struct config_item *src,
+ void (*drop_link)(struct config_item *src,
struct config_item *target);
};
diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index af5e2dc..9ee1490 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -466,7 +466,7 @@ static int nvmet_port_subsys_allow_link(struct config_item *parent,
return ret;
}
-static int nvmet_port_subsys_drop_link(struct config_item *parent,
+static void nvmet_port_subsys_drop_link(struct config_item *parent,
struct config_item *target)
{
struct nvmet_port *port = to_nvmet_port(parent->ci_parent);
@@ -474,21 +474,16 @@ static int nvmet_port_subsys_drop_link(struct config_item *parent,
struct nvmet_subsys_link *p;
down_write(&nvmet_config_sem);
- list_for_each_entry(p, &port->subsystems, entry) {
- if (p->subsys == subsys)
- goto found;
- }
- up_write(&nvmet_config_sem);
- return -EINVAL;
-
-found:
- list_del(&p->entry);
- nvmet_genctr++;
- if (list_empty(&port->subsystems))
- nvmet_disable_port(port);
+ list_for_each_entry(p, &port->subsystems, entry)
+ if (p->subsys == subsys) {
+ list_del(&p->entry);
+ nvmet_genctr++;
+ if (list_empty(&port->subsystems))
+ nvmet_disable_port(port);
+ kfree(p);
+ break;
+ }
up_write(&nvmet_config_sem);
- kfree(p);
- return 0;
}
static struct configfs_item_operations nvmet_port_subsys_item_ops = {
@@ -542,7 +537,7 @@ static int nvmet_allowed_hosts_allow_link(struct config_item *parent,
return ret;
}
-static int nvmet_allowed_hosts_drop_link(struct config_item *parent,
+static void nvmet_allowed_hosts_drop_link(struct config_item *parent,
struct config_item *target)
{
struct nvmet_subsys *subsys = to_subsys(parent->ci_parent);
@@ -550,19 +545,14 @@ static int nvmet_allowed_hosts_drop_link(struct config_item *parent,
struct nvmet_host_link *p;
down_write(&nvmet_config_sem);
- list_for_each_entry(p, &subsys->hosts, entry) {
- if (!strcmp(nvmet_host_name(p->host), nvmet_host_name(host)))
- goto found;
- }
- up_write(&nvmet_config_sem);
- return -EINVAL;
-
-found:
- list_del(&p->entry);
- nvmet_genctr++;
+ list_for_each_entry(p, &subsys->hosts, entry)
+ if (!strcmp(nvmet_host_name(p->host), nvmet_host_name(host))) {
+ list_del(&p->entry);
+ nvmet_genctr++;
+ kfree(p);
+ break;
+ }
up_write(&nvmet_config_sem);
- kfree(p);
- return 0;
}
static struct configfs_item_operations nvmet_allowed_hosts_item_ops = {
diff --git a/drivers/target/target_core_fabric_configfs.c b/drivers/target/target_core_fabric_configfs.c
index 31a096a..d8a16ca 100644
--- a/drivers/target/target_core_fabric_configfs.c
+++ b/drivers/target/target_core_fabric_configfs.c
@@ -137,7 +137,7 @@ static int target_fabric_mappedlun_link(
return core_dev_add_initiator_node_lun_acl(se_tpg, lacl, lun, lun_access_ro);
}
-static int target_fabric_mappedlun_unlink(
+static void target_fabric_mappedlun_unlink(
struct config_item *lun_acl_ci,
struct config_item *lun_ci)
{
@@ -146,7 +146,7 @@ static int target_fabric_mappedlun_unlink(
struct se_lun *lun = container_of(to_config_group(lun_ci),
struct se_lun, lun_group);
- return core_dev_del_initiator_node_lun_acl(lun, lacl);
+ core_dev_del_initiator_node_lun_acl(lun, lacl);
}
static struct se_lun_acl *item_to_lun_acl(struct config_item *item)
@@ -669,7 +669,7 @@ static int target_fabric_port_link(
return ret;
}
-static int target_fabric_port_unlink(
+static void target_fabric_port_unlink(
struct config_item *lun_ci,
struct config_item *se_dev_ci)
{
@@ -688,7 +688,6 @@ static int target_fabric_port_unlink(
}
core_dev_del_lun(se_tpg, lun);
- return 0;
}
static void target_fabric_port_release(struct config_item *item)
diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
index 3984787..78c4497 100644
--- a/drivers/usb/gadget/configfs.c
+++ b/drivers/usb/gadget/configfs.c
@@ -408,7 +408,7 @@ static int config_usb_cfg_link(
return ret;
}
-static int config_usb_cfg_unlink(
+static void config_usb_cfg_unlink(
struct config_item *usb_cfg_ci,
struct config_item *usb_func_ci)
{
@@ -437,12 +437,11 @@ static int config_usb_cfg_unlink(
list_del(&f->list);
usb_put_function(f);
mutex_unlock(&gi->lock);
- return 0;
+ return;
}
}
mutex_unlock(&gi->lock);
WARN(1, "Unable to locate function to unbind\n");
- return 0;
}
static struct configfs_item_operations gadget_config_item_ops = {
@@ -865,7 +864,7 @@ static int os_desc_link(struct config_item *os_desc_ci,
return ret;
}
-static int os_desc_unlink(struct config_item *os_desc_ci,
+static void os_desc_unlink(struct config_item *os_desc_ci,
struct config_item *usb_cfg_ci)
{
struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
@@ -878,7 +877,6 @@ static int os_desc_unlink(struct config_item *os_desc_ci,
cdev->os_desc_config = NULL;
WARN_ON(gi->composite.gadget_driver.udc_name);
mutex_unlock(&gi->lock);
- return 0;
}
static struct configfs_item_operations os_desc_ops = {
diff --git a/drivers/usb/gadget/function/uvc_configfs.c b/drivers/usb/gadget/function/uvc_configfs.c
index 31125a4..4e037d2 100644
--- a/drivers/usb/gadget/function/uvc_configfs.c
+++ b/drivers/usb/gadget/function/uvc_configfs.c
@@ -547,7 +547,7 @@ static int uvcg_control_class_allow_link(struct config_item *src,
return ret;
}
-static int uvcg_control_class_drop_link(struct config_item *src,
+static void uvcg_control_class_drop_link(struct config_item *src,
struct config_item *target)
{
struct config_item *control, *header;
@@ -555,7 +555,6 @@ static int uvcg_control_class_drop_link(struct config_item *src,
struct mutex *su_mutex = &src->ci_group->cg_subsys->su_mutex;
struct uvc_descriptor_header **class_array;
struct uvcg_control_header *target_hdr;
- int ret = -EINVAL;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
@@ -569,23 +568,17 @@ static int uvcg_control_class_drop_link(struct config_item *src,
mutex_lock(&opts->lock);
class_array = uvcg_get_ctl_class_arr(src, opts);
- if (!class_array)
- goto unlock;
- if (opts->refcnt) {
- ret = -EBUSY;
+ if (!class_array || opts->refcnt)
goto unlock;
- }
target_hdr = to_uvcg_control_header(target);
--target_hdr->linked;
class_array[0] = NULL;
- ret = 0;
unlock:
mutex_unlock(&opts->lock);
out:
mutex_unlock(su_mutex);
- return ret;
}
static struct configfs_item_operations uvcg_control_class_item_ops = {
@@ -777,7 +770,7 @@ static int uvcg_streaming_header_allow_link(struct config_item *src,
return ret;
}
-static int uvcg_streaming_header_drop_link(struct config_item *src,
+static void uvcg_streaming_header_drop_link(struct config_item *src,
struct config_item *target)
{
struct mutex *su_mutex = &src->ci_group->cg_subsys->su_mutex;
@@ -786,7 +779,6 @@ static int uvcg_streaming_header_drop_link(struct config_item *src,
struct uvcg_streaming_header *src_hdr;
struct uvcg_format *target_fmt = NULL;
struct uvcg_format_ptr *format_ptr, *tmp;
- int ret = -EINVAL;
src_hdr = to_uvcg_streaming_header(src);
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
@@ -811,8 +803,6 @@ static int uvcg_streaming_header_drop_link(struct config_item *src,
out:
mutex_unlock(&opts->lock);
mutex_unlock(su_mutex);
- return ret;
-
}
static struct configfs_item_operations uvcg_streaming_header_item_ops = {
@@ -2051,7 +2041,7 @@ static int uvcg_streaming_class_allow_link(struct config_item *src,
return ret;
}
-static int uvcg_streaming_class_drop_link(struct config_item *src,
+static void uvcg_streaming_class_drop_link(struct config_item *src,
struct config_item *target)
{
struct config_item *streaming, *header;
@@ -2059,7 +2049,6 @@ static int uvcg_streaming_class_drop_link(struct config_item *src,
struct mutex *su_mutex = &src->ci_group->cg_subsys->su_mutex;
struct uvc_descriptor_header ***class_array;
struct uvcg_streaming_header *target_hdr;
- int ret = -EINVAL;
mutex_lock(su_mutex); /* for navigating configfs hierarchy */
@@ -2076,23 +2065,19 @@ static int uvcg_streaming_class_drop_link(struct config_item *src,
if (!class_array || !*class_array)
goto unlock;
- if (opts->refcnt) {
- ret = -EBUSY;
+ if (opts->refcnt)
goto unlock;
- }
target_hdr = to_uvcg_streaming_header(target);
--target_hdr->linked;
kfree(**class_array);
kfree(*class_array);
*class_array = NULL;
- ret = 0;
unlock:
mutex_unlock(&opts->lock);
out:
mutex_unlock(su_mutex);
- return ret;
}
static struct configfs_item_operations uvcg_streaming_class_item_ops = {
diff --git a/include/linux/configfs.h b/include/linux/configfs.h
index d9d6a9d..9a30b92 100644
--- a/include/linux/configfs.h
+++ b/include/linux/configfs.h
@@ -228,7 +228,7 @@ struct configfs_bin_attribute {
struct configfs_item_operations {
void (*release)(struct config_item *);
int (*allow_link)(struct config_item *src, struct config_item *target);
- int (*drop_link)(struct config_item *src, struct config_item *target);
+ void (*drop_link)(struct config_item *src, struct config_item *target);
};
struct configfs_group_operations {
--
1.9.1
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