mmc: sdio: don't require CISTPL_VERS_1 to contain 4 strings

The PC Card 8.0 specification (vol.  4, section 3.2.10) says the
TPLLV1_INFO field of the CISTPL_VERS_1 tuple must contain 4 strings.  Some
cards don't have all 4 so just parse as many as we can.

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: David Vrabel <david.vrabel@csr.com>
Tested-by: Jonathan Cameron <jic23@cam.ac.uk>
Tested-by: Bing Zhao <bzhao@marvell.com>
Cc: Roel Kluin <roel.kluin@gmail.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/mmc/core/sdio_cis.c b/drivers/mmc/core/sdio_cis.c
index e1035c8958086b92ee9e563028c573d161cd104d..f85dcd5365082ab27cc77adefcb84f1364892f80 100644 (file)
--- a/drivers/mmc/core/sdio_cis.c
+++ b/drivers/mmc/core/sdio_cis.c
@@ -29,6 +29,8 @@ static int cistpl_vers_1(struct mmc_card *card, struct sdio_func *func,
        unsigned i, nr_strings;
        char **buffer, *string;
 
+       /* Find all null-terminated (including zero length) strings in
+          the TPLLV1_INFO field. Trailing garbage is ignored. */
        buf += 2;
        size -= 2;
 
@@ -39,11 +41,8 @@ static int cistpl_vers_1(struct mmc_card *card, struct sdio_func *func,
                if (buf[i] == 0)
                        nr_strings++;
        }
-
-       if (nr_strings < 4) {
-               printk(KERN_WARNING "SDIO: ignoring broken CISTPL_VERS_1\n");
+       if (nr_strings == 0)
                return 0;
-       }
 
        size = i;