From: Andrew Morton <akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
To: David Brownell <david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
Cc: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: [patch 2.6.22-rc3-git] SPI dynamic busid generation bugfix
Date: Fri, 1 Jun 2007 16:33:39 -0700 [thread overview]
Message-ID: <20070601163339.482e2327.akpm@linux-foundation.org> (raw)
In-Reply-To: <200706011612.19766.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
On Fri, 1 Jun 2007 16:12:19 -0700
David Brownell <david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org> wrote:
> Fix SPI dynamic bus ID assignment to start at 2^15-1 rather than
> a negative number. Valid bus ids are supposed to be positive,
> and are (now) stored in an 's16' value.
>
> Signed-off-by: David Brownell <dbrownell-Rn4VEauK+AKRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>
>
> --- a/drivers/spi/spi.c
> +++ b/drivers/spi/spi.c
> @@ -411,7 +411,7 @@ EXPORT_SYMBOL_GPL(spi_alloc_master);
> */
> int spi_register_master(struct spi_master *master)
> {
> - static atomic_t dyn_bus_id = ATOMIC_INIT((1<<16) - 1);
> + static atomic_t dyn_bus_id = ATOMIC_INIT((1<<15) - 1);
> struct device *dev = master->cdev.dev;
> int status = -ENODEV;
> int dynamic = 0;
Is this going to underflow then malfunction after 32k modprobe+rmmods?
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next prev parent reply other threads:[~2007-06-01 23:33 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-01 23:12 [patch 2.6.22-rc3-git] SPI dynamic busid generation bugfix David Brownell
[not found] ` <200706011612.19766.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2007-06-01 23:33 ` Andrew Morton [this message]
[not found] ` <20070601163339.482e2327.akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2007-06-01 23:46 ` David Brownell
[not found] ` <200706011646.12340.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2007-06-01 23:53 ` Andrew Morton
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