linux-kernel - Re: [RESEND PATCH v1 2/8] firmware_loader: Check fw_state_is_done in loading

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Date:   Thu, 14 Apr 2022 16:41:54 -0700
From:   Russ Weight <russell.h.weight@...el.com>
To:     Tom Rix <trix@...hat.com>, <mcgrof@...nel.org>,
        <gregkh@...uxfoundation.org>, <rafael@...nel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <lgoncalv@...hat.com>, <yilun.xu@...el.com>, <hao.wu@...el.com>,
        <matthew.gerlach@...el.com>, <basheer.ahmed.muddebihal@...el.com>,
        <tianfei.zhang@...el.com>
Subject: Re: [RESEND PATCH v1 2/8] firmware_loader: Check fw_state_is_done in
 loading_store



On 4/2/22 07:47, Tom Rix wrote:
>
> On 3/23/22 4:33 PM, Russ Weight wrote:
>> Add the fw_state_is_done() function and exit early from
>> firmware_loading_store() if the state is already "done". This is being done
>> in preparation for supporting persistent sysfs nodes to allow userspace to
>> upload firmware to a device, potentially reusing the sysfs loading and data
>> files multiple times.
>>
>> Signed-off-by: Russ Weight <russell.h.weight@...el.com>
>> ---
>> v1:
>>    - No change from RFC patch
>> ---
>>   drivers/base/firmware_loader/fallback.c | 2 +-
>>   drivers/base/firmware_loader/firmware.h | 5 +++++
>>   2 files changed, 6 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/base/firmware_loader/fallback.c b/drivers/base/firmware_loader/fallback.c
>> index 4afb0e9312c0..d82e055a4297 100644
>> --- a/drivers/base/firmware_loader/fallback.c
>> +++ b/drivers/base/firmware_loader/fallback.c
>> @@ -250,7 +250,7 @@ static ssize_t firmware_loading_store(struct device *dev,
>>         mutex_lock(&fw_lock);
>>       fw_priv = fw_sysfs->fw_priv;
>> -    if (fw_state_is_aborted(fw_priv))
>> +    if (fw_state_is_aborted(fw_priv) || fw_state_is_done(fw_priv))
>>           goto out;
>>         switch (loading) {
>> diff --git a/drivers/base/firmware_loader/firmware.h b/drivers/base/firmware_loader/firmware.h
>> index 2889f446ad41..58768d16f8df 100644
>> --- a/drivers/base/firmware_loader/firmware.h
>> +++ b/drivers/base/firmware_loader/firmware.h
>> @@ -149,6 +149,11 @@ static inline void fw_state_done(struct fw_priv *fw_priv)
>>       __fw_state_set(fw_priv, FW_STATUS_DONE);
>>   }
>>   +static inline bool fw_state_is_done(struct fw_priv *fw_priv)
>> +{
>> +    return __fw_state_check(fw_priv, FW_STATUS_DONE);
>
> This looks like the fw_sysfs_done() in fallback.c
>
> IMO this one and similar wrappers should move to firmware.h and use the *_is_* naming.

Thanks for catching that Tom. Yes, the new fw_state_is_done() function is exactly
the same as fw_sysfs_done(). I'll follow your suggestion and move fw_sysfs_done()
and fw_sysfs_loading() to firmware.h as fw_state_is_done() and fw_state_is_loading().

- Russ
>
> Tom
>
>> +}
>> +
>>   int assign_fw(struct firmware *fw, struct device *device);
>>     #ifdef CONFIG_FW_LOADER
>