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SubjectRe: [PATCH 3/3] soc: qcom: mdt_loader: add offset to request_firmware_into_buf
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Hi Greg,

On 2019-05-23 9:56 a.m., Greg Kroah-Hartman wrote:
> On Thu, May 23, 2019 at 09:41:49AM -0700, Scott Branden wrote:
>> Hi Greg,
>>
>> On 2019-05-22 10:52 p.m., Greg Kroah-Hartman wrote:
>>> On Wed, May 22, 2019 at 07:51:13PM -0700, Scott Branden wrote:
>>>> Adjust request_firmware_into_buf API to allow for portions
>>>> of firmware file to be read into a buffer. mdt_loader still
>>>> retricts request fo whole file read into buffer.
>>>>
>>>> Signed-off-by: Scott Branden <scott.branden@broadcom.com>
>>>> ---
>>>> drivers/soc/qcom/mdt_loader.c | 7 +++++--
>>>> 1 file changed, 5 insertions(+), 2 deletions(-)
>>>>
>>>> diff --git a/drivers/soc/qcom/mdt_loader.c b/drivers/soc/qcom/mdt_loader.c
>>>> index 1c488024c698..ad20d159699c 100644
>>>> --- a/drivers/soc/qcom/mdt_loader.c
>>>> +++ b/drivers/soc/qcom/mdt_loader.c
>>>> @@ -172,8 +172,11 @@ static int __qcom_mdt_load(struct device *dev, const struct firmware *fw,
>>>> if (phdr->p_filesz) {
>>>> sprintf(fw_name + fw_name_len - 3, "b%02d", i);
>>>> - ret = request_firmware_into_buf(&seg_fw, fw_name, dev,
>>>> - ptr, phdr->p_filesz);
>>>> + ret = request_firmware_into_buf
>>>> + (&seg_fw, fw_name, dev,
>>>> + ptr, phdr->p_filesz,
>>>> + 0,
>>>> + KERNEL_PREAD_FLAG_WHOLE);
>>> So, all that work in the first 2 patches for no real change at all? Why
>>> are these changes even needed?
>> The first two patches allow partial read of files into memory.
>>
>> Existing kernel drivers haven't need such functionality so, yes, there
>> should be no real change
>>
>> with first two patches other than adding such partial file read support.
>>
>> We have a new driver in development which needs partial read of files
>> supported in the kernel.
> As I said before, I can not take new apis without any in-kernel user.
> So let's wait for your new code that thinks it needs this, and then we
> will be glad to evaluate all of this at that point in time.

I have submitted all the necessary patches you requested here.

These include first adding tests for existing API that never had a
kernel selftest:

https://lkml.org/lkml/2019/8/22/1367

Followed by API enhancement, tests updated, and a new driver requiring
enhanced API:

https://lkml.org/lkml/2019/8/22/1404

>
> To do so otherwise is to have loads of unused "features" aquiring cruft
> in the kernel source, and you do not want that.
>
> thanks,
>
> greg k-h

Thanks,

Scott

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