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pcmcia: handle anonymous cards by generating a fake CIS

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The core pcmcia code blows up all over the place if it allowed a card without
a valid CIS. We need to allow such cards as the CIS stuff is not on the older
flash, ROM and SRAM cards.

In order to minimise the risk of misidentifying junk and feeding it to the
wrong thing we only fix up apparently anonymous cards if the driver for them
has been enabled.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Cox 2014-12-10 15:07:14 +00:00 committed by Greg Kroah-Hartman
parent 8402641b2d
commit 1c6c9b1d9d
1 changed files with 20 additions and 4 deletions
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24
drivers/pcmcia/cistpl.c
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@ -1451,10 +1451,26 @@ int pccard_validate_cis(struct pcmcia_socket *s, unsigned int *info)
done:
/* invalidate CIS cache on failure */
if (!dev_ok || !ident_ok || !count) {
mutex_lock(&s->ops_mutex);
destroy_cis_cache(s);
mutex_unlock(&s->ops_mutex);
ret = -EIO;
#if defined(CONFIG_MTD_PCMCIA_ANONYMOUS)
/* Set up as an anonymous card. If we don't have anonymous
memory support then just error the card as there is no
point trying to second guess.
Note: some cards have just a device entry, it may be
worth extending support to cover these in future */
if (!dev_ok || !ident_ok) {
dev_info(&s->dev, "no CIS, assuming an anonymous memory card.\n");
pcmcia_replace_cis(s, "\xFF", 1);
count = 1;
ret = 0;
} else
#endif
{
mutex_lock(&s->ops_mutex);
destroy_cis_cache(s);
mutex_unlock(&s->ops_mutex);
ret = -EIO;
}
}
if (info)