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SubjectRe: [patch 2/4] sdio: set the functions' block size
On Tue, 07 Aug 2007 18:20:26 +0100
David Vrabel <david.vrabel@csr.com> wrote:

> Pierre Ossman wrote:
> > On Tue, 07 Aug 2007 13:54:32 +0100
> > David Vrabel <david.vrabel@csr.com> wrote:
> >
> >>
> >> Index: mmc/drivers/mmc/core/sdio.c
> >> ===================================================================
> >> --- mmc.orig/drivers/mmc/core/sdio.c 2007-08-07
> >> 00:38:33.000000000 +0100 +++ mmc/drivers/mmc/core/sdio.c
> >> 2007-08-07 07:17:29.000000000 +0100 @@ -53,6 +53,7 @@
> >> {
> >> int ret;
> >> struct sdio_func *func;
> >> + unsigned block_size;
> >>
> >> BUG_ON(fn > SDIO_MAX_FUNCS);
> >>
> >> @@ -70,6 +71,15 @@
> >> if (ret)
> >> goto fail;
> >>
> >> + /*
> >> + * Set the function's block size to the largest supported
> >> by
> >> + * both the function and the host.
> >> + */
> >> + block_size = min(func->max_blksize,
> >> func->card->host->max_blk_size);
> >> + ret = sdio_set_block_size(func, block_size);
> >> + if (ret)
> >> + goto fail;
> >> +
> >> card->sdio_func[fn - 1] = func;
> >>
> >> return 0;
> >
> > This is probably better done in the sdio_enable_func().
>
> I don't think so. A driver might enable/disable a function multiple
> times but there's no need to set the block size every time.
>

Why would it want to do that?

Anyway, as long as cur_blksz is preserved, sdio_set_block_size() can
easily filter out redundant calls. No need to compromise in the rest of
the code for that.

In the patch I sent, the block size is set the first time is needed.
Wouldn't that avoid all problems?

> It may be best to move setting the block size back to before the probe
> so a driver can be sure the block size is something sensible.
> Consider a failed probe that called sdio_set_block_size() -- this
> will currently mess up drivers probed later.
>

Right, or remove the lock in the variant I proposed.

Rgds
--
-- Pierre Ossman

Linux kernel, MMC maintainer http://www.kernel.org
PulseAudio, core developer http://pulseaudio.org
rdesktop, core developer http://www.rdesktop.org
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