pcmcia: handle anonymous cards by generating a fake CIS

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>

diff --git a/drivers/pcmcia/cistpl.c b/drivers/pcmcia/cistpl.c
index 8b3b49217287faa17a1831d43f92a9cf85e76a1c..64d0515b76bd5ade5136b46a566f78d9c23ba831 100644 (file)
--- a/drivers/pcmcia/cistpl.c
+++ b/drivers/pcmcia/cistpl.c
@@ -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)