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authorAlan Cox <alan@linux.intel.com>2014-12-10 18:07:14 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-01-12 16:04:12 +0300
commit1c6c9b1d9d2530c346910329751e7fd1a02dc2bd (patch)
tree5a6a4211df883f2891c9fd242d92ac96c87ae103 /drivers/pcmcia
parent8402641b2dc73748dde81e3513ac61c8436be3cb (diff)
downloadlinux-1c6c9b1d9d2530c346910329751e7fd1a02dc2bd.tar.xz
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>
Diffstat (limited to 'drivers/pcmcia')
-rw-r--r--drivers/pcmcia/cistpl.c24
1 files changed, 20 insertions, 4 deletions
diff --git a/drivers/pcmcia/cistpl.c b/drivers/pcmcia/cistpl.c
index 8b3b49217287..64d0515b76bd 100644
--- 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)