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Date: Thu, 16 Mar 2017 14:55:09 +0100
From: Rafał Miłecki <zajec5@...il.com>
To: Ming Lei <tom.leiming@...il.com>,
"Luis R . Rodriguez" <mcgrof@...nel.org>,
Greg KH <gregkh@...uxfoundation.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc: Kalle Valo <kvalo@...eaurora.org>,
Arend van Spriel <arend.vanspriel@...adcom.com>,
linux-wireless@...r.kernel.org,
brcm80211-dev-list.pdl@...adcom.com,
Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH V4 1/2] firmware: add more flexible request_firmware_async
function
On 02/23/2017 07:30 PM, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal@...ecki.pl>
>
> So far we got only one function for loading firmware asynchronously:
> request_firmware_nowait. It didn't allow much customization of firmware
> loading process - there is only one bool uevent argument. Moreover this
> bool also controls user helper in an unclear way.
>
> Resolve this problem by adding one internally shared function that
> allows specifying any flags manually.
>
> This implementation:
> 1) Allows keeping old request_firmware_nowait API unchanged
> 2) Doesn't require adjusting / rewriting current drivers
> 3) Minimizes risk of regressions
> 4) Adds new function for drivers that need more control over loading a
> firmware.
>
> The new function takes options struct pointer as an argument to make
> further improvements possible (without any big reworks).
>
> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
> ---
> V3: Don't expose all FW_OPT_* flags.
> As Luis noted we want a struct so add struct firmware_opts for real
> flexibility.
> Thank you Luis for your review!
>
> Ming/Luis/Greg: assuming this gets a positive review, could someone of you pick
> this patchset?
Hi Ming,
It seems you changed e-mail address somewhere between V3 and V4 of this
patchset. Could you review/comment/ack this, please?
Luis: would you ack this patch now I followed your guidance?
> ---
> drivers/base/firmware_class.c | 43 ++++++++++++++++++++++++++++++++++---------
> include/linux/firmware.h | 15 ++++++++++++++-
> 2 files changed, 48 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
> index d05be1732c8b..b67b294eb31a 100644
> --- a/drivers/base/firmware_class.c
> +++ b/drivers/base/firmware_class.c
> @@ -1356,7 +1356,7 @@ static void request_firmware_work_func(struct work_struct *work)
> _request_firmware(&fw, fw_work->name, fw_work->device, NULL, 0,
> fw_work->opt_flags);
> fw_work->cont(fw, fw_work->context);
> - put_device(fw_work->device); /* taken in request_firmware_nowait() */
> + put_device(fw_work->device); /* taken in __request_firmware_nowait() */
>
> module_put(fw_work->module);
> kfree_const(fw_work->name);
> @@ -1364,10 +1364,9 @@ static void request_firmware_work_func(struct work_struct *work)
> }
>
> /**
> - * request_firmware_nowait - asynchronous version of request_firmware
> + * __request_firmware_nowait - asynchronous version of request_firmware
> * @module: module requesting the firmware
> - * @uevent: sends uevent to copy the firmware image if this flag
> - * is non-zero else the firmware copy must be done manually.
> + * @opt_flags: flags that control firmware loading process, see FW_OPT_*
> * @name: name of firmware file
> * @device: device for which firmware is being loaded
> * @gfp: allocation flags
> @@ -1386,9 +1385,9 @@ static void request_firmware_work_func(struct work_struct *work)
> *
> * - can't sleep at all if @gfp is GFP_ATOMIC.
> **/
> -int
> -request_firmware_nowait(
> - struct module *module, bool uevent,
> +static int
> +__request_firmware_nowait(
> + struct module *module, unsigned int opt_flags,
> const char *name, struct device *device, gfp_t gfp, void *context,
> void (*cont)(const struct firmware *fw, void *context))
> {
> @@ -1407,8 +1406,7 @@ request_firmware_nowait(
> fw_work->device = device;
> fw_work->context = context;
> fw_work->cont = cont;
> - fw_work->opt_flags = FW_OPT_NOWAIT | FW_OPT_FALLBACK |
> - (uevent ? FW_OPT_UEVENT : FW_OPT_USERHELPER);
> + fw_work->opt_flags = FW_OPT_NOWAIT | opt_flags;
>
> if (!try_module_get(module)) {
> kfree_const(fw_work->name);
> @@ -1421,8 +1419,35 @@ request_firmware_nowait(
> schedule_work(&fw_work->work);
> return 0;
> }
> +
> +int request_firmware_nowait(struct module *module, bool uevent,
> + const char *name, struct device *device, gfp_t gfp,
> + void *context,
> + void (*cont)(const struct firmware *fw, void *context))
> +{
> + unsigned int opt_flags = FW_OPT_FALLBACK |
> + (uevent ? FW_OPT_UEVENT : FW_OPT_USERHELPER);
> +
> + return __request_firmware_nowait(module, opt_flags, name, device, gfp,
> + context, cont);
> +}
> EXPORT_SYMBOL(request_firmware_nowait);
>
> +int __request_firmware_async(struct module *module, const char *name,
> + struct firmware_opts *fw_opts, struct device *dev,
> + void *context,
> + void (*cont)(const struct firmware *fw, void *context))
> +{
> + unsigned int opt_flags = FW_OPT_UEVENT;
> +
> + if (fw_opts->optional)
> + opt_flags |= FW_OPT_NO_WARN;
> +
> + return __request_firmware_nowait(module, opt_flags, name, dev,
> + GFP_KERNEL, context, cont);
> +}
> +EXPORT_SYMBOL(__request_firmware_async);
> +
> #ifdef CONFIG_PM_SLEEP
> static ASYNC_DOMAIN_EXCLUSIVE(fw_cache_domain);
>
> diff --git a/include/linux/firmware.h b/include/linux/firmware.h
> index b1f9f0ccb8ac..a32b6e67462d 100644
> --- a/include/linux/firmware.h
> +++ b/include/linux/firmware.h
> @@ -82,6 +82,19 @@ static inline int request_firmware_into_buf(const struct firmware **firmware_p,
> {
> return -EINVAL;
> }
> -
> #endif
> +
> +struct firmware_opts {
> + bool optional;
> +};
> +
> +int __request_firmware_async(struct module *module, const char *name,
> + struct firmware_opts *fw_opts, struct device *dev,
> + void *context,
> + void (*cont)(const struct firmware *fw, void *context));
> +
> +#define request_firmware_async(name, fw_opts, dev, context, cont) \
> + __request_firmware_async(THIS_MODULE, name, fw_opts, dev, \
> + context, cont)
> +
> #endif
>
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