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Date: Tue, 12 Nov 2013 10:11:09 +0800
From: Ming Lei <ming.lei@...onical.com>
To: Takashi Iwai <tiwai@...e.de>
Cc: Borislav Petkov <bp@...en8.de>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Prarit Bhargava <prarit@...hat.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
x86@...nel.org, amd64-microcode@...64.org
Subject: Re: [PATCH v2 1/3] firmware: Introduce request_firmware_direct()
On Tue, Nov 12, 2013 at 1:30 AM, Takashi Iwai <tiwai@...e.de> wrote:
> At Mon, 11 Nov 2013 16:34:26 +0100,
>
> Sounds like a good idea. How about the patch below?
> (I used unsigned int since there shouldn't be so many different
> behaviors.)
>
>
> thanks,
>
> Takashi
>
> ===
>
> From: Takashi Iwai <tiwai@...e.de>
> Subject: [PATCH] firmware: Use bit flags instead of boolean combos
>
> More than two boolean arguments to a function are rather confusing and
> error-prone for callers. Let's make the behavior bit flags instead of
> triple combos.
>
> A nice suggestion by Borislav Petkov.
>
> Signed-off-by: Takashi Iwai <tiwai@...e.de>
Nice work,
Acked-by: Ming Lei <ming.lei@...onical.com>
Thanks,
--
Ming Lei
> ---
> drivers/base/firmware_class.c | 49 ++++++++++++++++++++++++-------------------
> 1 file changed, 28 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
> index bb03c71bd94d..a4eaa7b82882 100644
> --- a/drivers/base/firmware_class.c
> +++ b/drivers/base/firmware_class.c
> @@ -96,6 +96,11 @@ static inline long firmware_loading_timeout(void)
> return loading_timeout > 0 ? loading_timeout * HZ : MAX_SCHEDULE_TIMEOUT;
> }
>
> +/* firmware behavior options */
> +#define FW_OPT_UEVENT (1U << 0)
> +#define FW_OPT_NOWAIT (1U << 1)
> +#define FW_OPT_FALLBACK (1U << 2)
> +
> struct firmware_cache {
> /* firmware_buf instance will be added into the below list */
> spinlock_t lock;
> @@ -820,7 +825,7 @@ static void firmware_class_timeout_work(struct work_struct *work)
>
> static struct firmware_priv *
> fw_create_instance(struct firmware *firmware, const char *fw_name,
> - struct device *device, bool uevent, bool nowait)
> + struct device *device, unsigned int opt_flags)
> {
> struct firmware_priv *fw_priv;
> struct device *f_dev;
> @@ -832,7 +837,7 @@ fw_create_instance(struct firmware *firmware, const char *fw_name,
> goto exit;
> }
>
> - fw_priv->nowait = nowait;
> + fw_priv->nowait = !!(opt_flags & FW_OPT_NOWAIT);
> fw_priv->fw = firmware;
> INIT_DELAYED_WORK(&fw_priv->timeout_work,
> firmware_class_timeout_work);
> @@ -848,8 +853,8 @@ exit:
> }
>
> /* load a firmware via user helper */
> -static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent,
> - long timeout)
> +static int _request_firmware_load(struct firmware_priv *fw_priv,
> + unsigned int opt_flags, long timeout)
> {
> int retval = 0;
> struct device *f_dev = &fw_priv->dev;
> @@ -885,7 +890,7 @@ static int _request_firmware_load(struct firmware_priv *fw_priv, bool uevent,
> goto err_del_bin_attr;
> }
>
> - if (uevent) {
> + if (opt_flags & FW_OPT_UEVENT) {
> buf->need_uevent = true;
> dev_set_uevent_suppress(f_dev, false);
> dev_dbg(f_dev, "firmware: requesting %s\n", buf->fw_id);
> @@ -911,16 +916,16 @@ err_put_dev:
>
> static int fw_load_from_user_helper(struct firmware *firmware,
> const char *name, struct device *device,
> - bool uevent, bool nowait, long timeout)
> + unsigned int opt_flags, long timeout)
> {
> struct firmware_priv *fw_priv;
>
> - fw_priv = fw_create_instance(firmware, name, device, uevent, nowait);
> + fw_priv = fw_create_instance(firmware, name, device, opt_flags);
> if (IS_ERR(fw_priv))
> return PTR_ERR(fw_priv);
>
> fw_priv->buf = firmware->priv;
> - return _request_firmware_load(fw_priv, uevent, timeout);
> + return _request_firmware_load(fw_priv, opt_flags, timeout);
> }
>
> #ifdef CONFIG_PM_SLEEP
> @@ -1015,7 +1020,7 @@ _request_firmware_prepare(struct firmware **firmware_p, const char *name,
> }
>
> static int assign_firmware_buf(struct firmware *fw, struct device *device,
> - bool skip_cache)
> + unsigned int opt_flags)
> {
> struct firmware_buf *buf = fw->priv;
>
> @@ -1032,7 +1037,8 @@ static int assign_firmware_buf(struct firmware *fw, struct device *device,
> * device may has been deleted already, but the problem
> * should be fixed in devres or driver core.
> */
> - if (device && !skip_cache)
> + /* don't cache firmware handled without uevent */
> + if (device && (opt_flags & FW_OPT_UEVENT))
> fw_add_devm_name(device, buf->fw_id);
>
> /*
> @@ -1053,7 +1059,7 @@ static int assign_firmware_buf(struct firmware *fw, struct device *device,
> /* called from request_firmware() and request_firmware_work_func() */
> static int
> _request_firmware(const struct firmware **firmware_p, const char *name,
> - struct device *device, bool uevent, bool nowait, bool fallback)
> + struct device *device, unsigned int opt_flags)
> {
> struct firmware *fw;
> long timeout;
> @@ -1068,7 +1074,7 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
>
> ret = 0;
> timeout = firmware_loading_timeout();
> - if (nowait) {
> + if (opt_flags & FW_OPT_NOWAIT) {
> timeout = usermodehelper_read_lock_wait(timeout);
> if (!timeout) {
> dev_dbg(device, "firmware: %s loading timed out\n",
> @@ -1090,17 +1096,16 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
> dev_warn(device, "Direct firmware load failed with error %d\n",
> ret);
> #ifdef CONFIG_FW_LOADER_USER_HELPER
> - if (fallback) {
> + if (opt_flags & FW_OPT_FALLBACK) {
> dev_warn(device, "Falling back to user helper\n");
> ret = fw_load_from_user_helper(fw, name, device,
> - uevent, nowait, timeout);
> + opt_flags, timeout);
> }
> #endif
> }
>
> - /* don't cache firmware handled without uevent */
> if (!ret)
> - ret = assign_firmware_buf(fw, device, !uevent);
> + ret = assign_firmware_buf(fw, device, opt_flags);
>
> usermodehelper_read_unlock();
>
> @@ -1142,7 +1147,8 @@ request_firmware(const struct firmware **firmware_p, const char *name,
>
> /* Need to pin this module until return */
> __module_get(THIS_MODULE);
> - ret = _request_firmware(firmware_p, name, device, true, false, true);
> + ret = _request_firmware(firmware_p, name, device,
> + FW_OPT_UEVENT | FW_OPT_FALLBACK);
> module_put(THIS_MODULE);
> return ret;
> }
> @@ -1165,7 +1171,7 @@ int request_firmware_direct(const struct firmware **firmware_p,
> {
> int ret;
> __module_get(THIS_MODULE);
> - ret = _request_firmware(firmware_p, name, device, true, false, false);
> + ret = _request_firmware(firmware_p, name, device, FW_OPT_UEVENT);
> module_put(THIS_MODULE);
> return ret;
> }
> @@ -1194,7 +1200,7 @@ struct firmware_work {
> struct device *device;
> void *context;
> void (*cont)(const struct firmware *fw, void *context);
> - bool uevent;
> + unsigned int opt_flags;
> };
>
> static void request_firmware_work_func(struct work_struct *work)
> @@ -1205,7 +1211,7 @@ static void request_firmware_work_func(struct work_struct *work)
> fw_work = container_of(work, struct firmware_work, work);
>
> _request_firmware(&fw, fw_work->name, fw_work->device,
> - fw_work->uevent, true, true);
> + fw_work->opt_flags);
> fw_work->cont(fw, fw_work->context);
> put_device(fw_work->device); /* taken in request_firmware_nowait() */
>
> @@ -1253,7 +1259,8 @@ request_firmware_nowait(
> fw_work->device = device;
> fw_work->context = context;
> fw_work->cont = cont;
> - fw_work->uevent = uevent;
> + fw_work->opt_flags = FW_OPT_NOWAIT | FW_OPT_FALLBACK |
> + (uevent ? FW_OPT_UEVENT : 0);
>
> if (!try_module_get(module)) {
> kfree(fw_work);
> --
> 1.8.4.2
>
--
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