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Date: Tue, 27 Mar 2012 23:47:06 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Stephen Boyd <sboyd@...eaurora.org>
Cc: linux-kernel@...r.kernel.org,
Linus Torvalds <torvalds@...ux-foundation.org>,
Saravana Kannan <skannan@...eaurora.org>,
Kay Sievers <kay.sievers@...y.org>,
Greg KH <gregkh@...uxfoundation.org>,
Christian Lamparter <chunkeey@...glemail.com>,
"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
alan@...rguk.ukuu.org.uk,
Linux PM mailing list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 1/2] firmware_class: Reorganize fw_create_instance()
On Tuesday, March 27, 2012, Stephen Boyd wrote:
> Recent patches to split up the three phases of request_firmware()
> lead to a casting away of const in fw_create_instance(). We can
> avoid this cast by splitting up fw_create_instance() a bit.
>
> Make _request_firmware_setup() return a struct fw_priv and use
> that struct instead of passing struct firmware to
> _request_firmware(). Move the uevent and device file creation
> bits to the loading phase and rename the function to
> _request_firmware_load() to better reflect its purpose.
>
> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
Looks good to me.
Greg, if that's fine with you, I'll add this patch (and the next one)
to my firmware_class series you've looked at recently.
Thanks,
Rafael
> ---
> drivers/base/firmware_class.c | 135 +++++++++++++++++++----------------------
> 1 file changed, 62 insertions(+), 73 deletions(-)
>
> diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
> index 72c644b..ae00a2f 100644
> --- a/drivers/base/firmware_class.c
> +++ b/drivers/base/firmware_class.c
> @@ -440,21 +440,19 @@ static void firmware_class_timeout(u_long data)
> }
>
> static struct firmware_priv *
> -fw_create_instance(const struct firmware *firmware, const char *fw_name,
> +fw_create_instance(struct firmware *firmware, const char *fw_name,
> struct device *device, bool uevent, bool nowait)
> {
> struct firmware_priv *fw_priv;
> struct device *f_dev;
> - int error;
>
> fw_priv = kzalloc(sizeof(*fw_priv) + strlen(fw_name) + 1 , GFP_KERNEL);
> if (!fw_priv) {
> dev_err(device, "%s: kmalloc failed\n", __func__);
> - error = -ENOMEM;
> - goto err_out;
> + return ERR_PTR(-ENOMEM);
> }
>
> - fw_priv->fw = (struct firmware *)firmware;
> + fw_priv->fw = firmware;
> fw_priv->nowait = nowait;
> strcpy(fw_priv->fw_id, fw_name);
> init_completion(&fw_priv->completion);
> @@ -468,74 +466,37 @@ fw_create_instance(const struct firmware *firmware, const char *fw_name,
> f_dev->parent = device;
> f_dev->class = &firmware_class;
>
> - dev_set_uevent_suppress(f_dev, true);
> -
> - /* Need to pin this module until class device is destroyed */
> - __module_get(THIS_MODULE);
> -
> - error = device_add(f_dev);
> - if (error) {
> - dev_err(device, "%s: device_register failed\n", __func__);
> - goto err_put_dev;
> - }
> -
> - error = device_create_bin_file(f_dev, &firmware_attr_data);
> - if (error) {
> - dev_err(device, "%s: sysfs_create_bin_file failed\n", __func__);
> - goto err_del_dev;
> - }
> -
> - error = device_create_file(f_dev, &dev_attr_loading);
> - if (error) {
> - dev_err(device, "%s: device_create_file failed\n", __func__);
> - goto err_del_bin_attr;
> - }
> -
> - if (uevent)
> - dev_set_uevent_suppress(f_dev, false);
> -
> return fw_priv;
> -
> -err_del_bin_attr:
> - device_remove_bin_file(f_dev, &firmware_attr_data);
> -err_del_dev:
> - device_del(f_dev);
> -err_put_dev:
> - put_device(f_dev);
> -err_out:
> - return ERR_PTR(error);
> -}
> -
> -static void fw_destroy_instance(struct firmware_priv *fw_priv)
> -{
> - struct device *f_dev = &fw_priv->dev;
> -
> - device_remove_file(f_dev, &dev_attr_loading);
> - device_remove_bin_file(f_dev, &firmware_attr_data);
> - device_unregister(f_dev);
> }
>
> -static int _request_firmware_prepare(const struct firmware **firmware_p,
> - const char *name, struct device *device)
> +static struct firmware_priv *
> +_request_firmware_prepare(const struct firmware **firmware_p, const char *name,
> + struct device *device, bool uevent, bool nowait)
> {
> struct firmware *firmware;
> + struct firmware_priv *fw_priv;
>
> if (!firmware_p)
> - return -EINVAL;
> + return ERR_PTR(-EINVAL);
>
> *firmware_p = firmware = kzalloc(sizeof(*firmware), GFP_KERNEL);
> if (!firmware) {
> dev_err(device, "%s: kmalloc(struct firmware) failed\n",
> __func__);
> - return -ENOMEM;
> + return ERR_PTR(-ENOMEM);
> }
>
> if (fw_get_builtin_firmware(firmware, name)) {
> dev_dbg(device, "firmware: using built-in firmware %s\n", name);
> - return 0;
> + return NULL;
> }
>
> - return 1;
> + fw_priv = fw_create_instance(firmware, name, device, uevent, nowait);
> + if (IS_ERR(fw_priv)) {
> + release_firmware(firmware);
> + *firmware_p = NULL;
> + }
> + return fw_priv;
> }
>
> static void _request_firmware_cleanup(const struct firmware **firmware_p)
> @@ -544,21 +505,38 @@ static void _request_firmware_cleanup(const struct firmware **firmware_p)
> *firmware_p = NULL;
> }
>
> -static int _request_firmware(const struct firmware *firmware,
> - const char *name, struct device *device,
> - bool uevent, bool nowait, long timeout)
> +static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent,
> + long timeout)
> {
> - struct firmware_priv *fw_priv;
> int retval = 0;
> + struct device *f_dev = &fw_priv->dev;
> +
> + dev_set_uevent_suppress(f_dev, true);
>
> - if (uevent)
> - dev_dbg(device, "firmware: requesting %s\n", name);
> + /* Need to pin this module until class device is destroyed */
> + __module_get(THIS_MODULE);
>
> - fw_priv = fw_create_instance(firmware, name, device, uevent, nowait);
> - if (IS_ERR(fw_priv))
> - return PTR_ERR(fw_priv);
> + retval = device_add(f_dev);
> + if (retval) {
> + dev_err(f_dev, "%s: device_register failed\n", __func__);
> + goto err_put_dev;
> + }
> +
> + retval = device_create_bin_file(f_dev, &firmware_attr_data);
> + if (retval) {
> + dev_err(f_dev, "%s: sysfs_create_bin_file failed\n", __func__);
> + goto err_del_dev;
> + }
> +
> + retval = device_create_file(f_dev, &dev_attr_loading);
> + if (retval) {
> + dev_err(f_dev, "%s: device_create_file failed\n", __func__);
> + goto err_del_bin_attr;
> + }
>
> if (uevent) {
> + dev_set_uevent_suppress(f_dev, false);
> + dev_dbg(f_dev, "firmware: requesting %s\n", fw_priv->fw_id);
> if (timeout != MAX_SCHEDULE_TIMEOUT)
> mod_timer(&fw_priv->timeout,
> round_jiffies_up(jiffies + timeout));
> @@ -577,7 +555,13 @@ static int _request_firmware(const struct firmware *firmware,
> fw_priv->fw = NULL;
> mutex_unlock(&fw_lock);
>
> - fw_destroy_instance(fw_priv);
> + device_remove_file(f_dev, &dev_attr_loading);
> +err_del_bin_attr:
> + device_remove_bin_file(f_dev, &firmware_attr_data);
> +err_del_dev:
> + device_del(f_dev);
> +err_put_dev:
> + put_device(f_dev);
> return retval;
> }
>
> @@ -600,17 +584,19 @@ int
> request_firmware(const struct firmware **firmware_p, const char *name,
> struct device *device)
> {
> + struct firmware_priv *fw_priv;
> int ret;
>
> - ret = _request_firmware_prepare(firmware_p, name, device);
> - if (ret <= 0)
> - return ret;
> + fw_priv = _request_firmware_prepare(firmware_p, name, device, true,
> + false);
> + if (IS_ERR_OR_NULL(fw_priv))
> + return PTR_RET(fw_priv);
>
> ret = usermodehelper_read_trylock();
> if (WARN_ON(ret)) {
> dev_err(device, "firmware: %s will not be loaded\n", name);
> } else {
> - ret = _request_firmware(*firmware_p, name, device, true, false,
> + ret = _request_firmware_load(fw_priv, true,
> firmware_loading_timeout());
> usermodehelper_read_unlock();
> }
> @@ -648,6 +634,7 @@ static int request_firmware_work_func(void *arg)
> {
> struct firmware_work *fw_work = arg;
> const struct firmware *fw;
> + struct firmware_priv *fw_priv;
> long timeout;
> int ret;
>
> @@ -656,14 +643,16 @@ static int request_firmware_work_func(void *arg)
> return 0;
> }
>
> - ret = _request_firmware_prepare(&fw, fw_work->name, fw_work->device);
> - if (ret <= 0)
> + fw_priv = _request_firmware_prepare(&fw, fw_work->name, fw_work->device,
> + fw_work->uevent, true);
> + if (IS_ERR_OR_NULL(fw_priv)) {
> + ret = PTR_RET(fw_priv);
> goto out;
> + }
>
> timeout = usermodehelper_read_lock_wait(firmware_loading_timeout());
> if (timeout) {
> - ret = _request_firmware(fw, fw_work->name, fw_work->device,
> - fw_work->uevent, true, timeout);
> + ret = _request_firmware_load(fw_priv, fw_work->uevent, timeout);
> usermodehelper_read_unlock();
> } else {
> dev_dbg(fw_work->device, "firmware: %s loading timed out\n",
>
--
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