Re: [PATCH] advansys: use request_firmware

Jaswinder Singh
2008-07-12T17:09:58Z

Hello Mattew,

On Sat, 2008-07-12 at 10:29 -0600, Matthew Wilcox wrote:
> > + if (AscLoadMicroCode(iop_base, 0, &fw->data[4],
> > + fw->size - 4) != chksum) {
> > asc_dvc->err_code |= ASC_IERR_MCODE_CHKSUM;
> > return warn_code;
> > }
> > + release_firmware(fw);
>

Sorry, It should be :-
+ if (AscLoadMicroCode(iop_base, 0, &fw->data[4],
+ fw->size - 4) != chksum) {
asc_dvc->err_code |= ASC_IERR_MCODE_CHKSUM;
+ release_firmware(fw);
return warn_code;
}
+ release_firmware(fw);
warn_code |= AscInitMicroCodeVar(asc_dvc);

You can get updated patch from
http://git.infradead.org/users/jaswinder/firm-jsr-2.6.git

This is first draft, final patch will available at David's firmware tree
http://git.infradead.org/users/dwmw2/firmware-2.6.git

> You're calling release_firmware() here. I don't know if that actually
> frees the firmware when it's built-in, but if it does, then freeing the
> firmware could cause the chip to stop working if it gets reset before
> userspace is up.

Normally release_firmware will be called after loading microcode.

Even it gets reset then It will again call request_firmware and load
firmware and then frees after loading microcode.

Logically it will work same as microcode_buffer say _adv_asc3550_buf[]
when you need to load microcode you just read from ﻿_adv_asc3550_buf[]
and load it. And if reset occurs you again read from ﻿_adv_asc3550_buf[]
and then load microcode, but you keep ﻿_adv_asc3550_buf[] all the time
in memory.
In our case we just request_firmware when need to load microcode and
release_firmware after loading. So we frees the memory after loading
microcode.

So it will not stop the chip from working.

> If it is OK to call release_firmware here, then the error path is
> missing a release_firmware() call.
>

Fixed. Thanks.

If you still have some doubts, please let me know.

Thank you,

Jaswinder Singh.