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target: Fix target_core_register_fabric() for built-in fabric modules

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If we try to create a fabric directory in configfs for one of the
default hard-coded fabric modules (iscsi and loopback), and that
fabric is actually built into the kernel, then the operation will
spuriously fail because request_module() (for the code that's already
linked into the kernel) fails.

Fix this by running the autoprobing code only if an initial
target_core_get_fabric() fails.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Roland Dreier 2014-11-14 12:54:36 -08:00 committed by Nicholas Bellinger
parent b1a5ad006b
commit e7b7af6e98
1 changed files with 47 additions and 38 deletions
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85
drivers/target/target_core_configfs.c
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@ -126,48 +126,57 @@ static struct config_group *target_core_register_fabric(
pr_debug("Target_Core_ConfigFS: REGISTER -> group: %p name:"
" %s\n", group, name);
/*
* Below are some hardcoded request_module() calls to automatically
* local fabric modules when the following is called:
*
* mkdir -p /sys/kernel/config/target/$MODULE_NAME
*
* Note that this does not limit which TCM fabric module can be
* registered, but simply provids auto loading logic for modules with
* mkdir(2) system calls with known TCM fabric modules.
*/
if (!strncmp(name, "iscsi", 5)) {
/*
* Automatically load the LIO Target fabric module when the
* following is called:
*
* mkdir -p $CONFIGFS/target/iscsi
*/
ret = request_module("iscsi_target_mod");
if (ret < 0) {
pr_err("request_module() failed for"
" iscsi_target_mod.ko: %d\n", ret);
return ERR_PTR(-EINVAL);
}
} else if (!strncmp(name, "loopback", 8)) {
/*
* Automatically load the tcm_loop fabric module when the
* following is called:
*
* mkdir -p $CONFIGFS/target/loopback
*/
ret = request_module("tcm_loop");
if (ret < 0) {
pr_err("request_module() failed for"
" tcm_loop.ko: %d\n", ret);
return ERR_PTR(-EINVAL);
}
}
tf = target_core_get_fabric(name);
if (!tf) {
pr_err("target_core_get_fabric() failed for %s\n",
pr_err("target_core_register_fabric() trying autoload for %s\n",
name);
/*
* Below are some hardcoded request_module() calls to automatically
* local fabric modules when the following is called:
*
* mkdir -p /sys/kernel/config/target/$MODULE_NAME
*
* Note that this does not limit which TCM fabric module can be
* registered, but simply provids auto loading logic for modules with
* mkdir(2) system calls with known TCM fabric modules.
*/
if (!strncmp(name, "iscsi", 5)) {
/*
* Automatically load the LIO Target fabric module when the
* following is called:
*
* mkdir -p $CONFIGFS/target/iscsi
*/
ret = request_module("iscsi_target_mod");
if (ret < 0) {
pr_err("request_module() failed for"
" iscsi_target_mod.ko: %d\n", ret);
return ERR_PTR(-EINVAL);
}
} else if (!strncmp(name, "loopback", 8)) {
/*
* Automatically load the tcm_loop fabric module when the
* following is called:
*
* mkdir -p $CONFIGFS/target/loopback
*/
ret = request_module("tcm_loop");
if (ret < 0) {
pr_err("request_module() failed for"
" tcm_loop.ko: %d\n", ret);
return ERR_PTR(-EINVAL);
}
}
tf = target_core_get_fabric(name);
}
if (!tf) {
pr_err("target_core_get_fabric() failed for %s\n",
name);
return ERR_PTR(-EINVAL);
}
pr_debug("Target_Core_ConfigFS: REGISTER -> Located fabric:"