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firmware_class: Split _request_firmware() into three functions, v2 

Split _request_firmware() into three functions,
_request_firmware_prepare() doing preparatory work that need not be
done under umhelper_sem, _request_firmware_cleanup() doing the
post-error cleanup and _request_firmware() carrying out the remaining
operations.

This change is requisite for moving the acquisition of umhelper_sem
from _request_firmware() to the callers, which is going to be done
subsequently.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Cc: stable@vger.kernel.org
This commit is contained in:
Rafael J. Wysocki 2012-03-28 23:29:55 +02:00
parent fe2e39d878
commit 811fa40044
1 changed files with 41 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
drivers/base/firmware_class.c
View File

@ -435,7 +435,7 @@ static void firmware_class_timeout(u_long data)
}
static struct firmware_priv *
fw_create_instance(struct firmware *firmware, const char *fw_name,
fw_create_instance(const struct firmware *firmware, const char *fw_name,
struct device *device, bool uevent, bool nowait)
{
struct firmware_priv *fw_priv;
@ -449,7 +449,7 @@ fw_create_instance(struct firmware *firmware, const char *fw_name,
goto err_out;
}
fw_priv->fw = firmware;
fw_priv->fw = (struct firmware *)firmware;
fw_priv->nowait = nowait;
strcpy(fw_priv->fw_id, fw_name);
init_completion(&fw_priv->completion);
@ -510,13 +510,10 @@ static void fw_destroy_instance(struct firmware_priv *fw_priv)
device_unregister(f_dev);
}
static int _request_firmware(const struct firmware **firmware_p,
const char *name, struct device *device,
bool uevent, bool nowait)
static int _request_firmware_prepare(const struct firmware **firmware_p,
const char *name, struct device *device)
{
struct firmware_priv *fw_priv;
struct firmware *firmware;
int retval = 0;
if (!firmware_p)
return -EINVAL;
@ -533,10 +530,26 @@ static int _request_firmware(const struct firmware **firmware_p,
return 0;
}
return 1;
}
static void _request_firmware_cleanup(const struct firmware **firmware_p)
{
release_firmware(*firmware_p);
*firmware_p = NULL;
}
static int _request_firmware(const struct firmware *firmware,
const char *name, struct device *device,
bool uevent, bool nowait)
{
struct firmware_priv *fw_priv;
int retval;
retval = usermodehelper_read_trylock();
if (WARN_ON(retval)) {
dev_err(device, "firmware: %s will not be loaded\n", name);
goto out_nolock;
return retval;
}
if (uevent)
@ -572,13 +585,6 @@ static int _request_firmware(const struct firmware **firmware_p,
out:
usermodehelper_read_unlock();
out_nolock:
if (retval) {
release_firmware(firmware);
*firmware_p = NULL;
}
return retval;
}
@ -601,7 +607,17 @@ int
request_firmware(const struct firmware **firmware_p, const char *name,
struct device *device)
{
return _request_firmware(firmware_p, name, device, true, false);
int ret;
ret = _request_firmware_prepare(firmware_p, name, device);
if (ret <= 0)
return ret;
ret = _request_firmware(*firmware_p, name, device, true, false);
if (ret)
_request_firmware_cleanup(firmware_p);
return ret;
}
/**
@ -639,8 +655,16 @@ static int request_firmware_work_func(void *arg)
return 0;
}
ret = _request_firmware(&fw, fw_work->name, fw_work->device,
ret = _request_firmware_prepare(&fw, fw_work->name, fw_work->device);
if (ret <= 0)
goto out;
ret = _request_firmware(fw, fw_work->name, fw_work->device,
fw_work->uevent, true);
if (ret)
_request_firmware_cleanup(&fw);
out:
fw_work->cont(fw, fw_work->context);
module_put(fw_work->module);