pcmcia: cleanup pccard_validate_cis()

Cleanup pccard_validate_cis() and make it return an error code on
all failures, not merely on some failures.

Tested-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

1 files changed, 81 insertions, 74 deletions

diff --git a/drivers/pcmcia/cistpl.c b/drivers/pcmcia/cistpl.c
index 41ec7729edd..04bf1ba607f 100644
--- a/drivers/pcmcia/cistpl.c
+++ b/drivers/pcmcia/cistpl.c
@@ -1577,88 +1577,95 @@ next_entry:
 EXPORT_SYMBOL(pccard_loop_tuple);
 
 
-/*======================================================================
-
-    This tries to determine if a card has a sensible CIS.  It returns
-    the number of tuples in the CIS, or 0 if the CIS looks bad.  The
-    checks include making sure several critical tuples are present and
-    valid; seeing if the total number of tuples is reasonable; and
-    looking for tuples that use reserved codes.
-
-======================================================================*/
-
+/**
+ * pccard_validate_cis() - check whether card has a sensible CIS
+ * @s:          the struct pcmcia_socket we are to check
+ * @info:       returns the number of tuples in the (valid) CIS, or 0
+ *
+ * This tries to determine if a card has a sensible CIS.  In @info, it
+ * returns the number of tuples in the CIS, or 0 if the CIS looks bad. The
+ * checks include making sure several critical tuples are present and
+ * valid; seeing if the total number of tuples is reasonable; and
+ * looking for tuples that use reserved codes.
+ *
+ * The function returns 0 on success.
+ */
 int pccard_validate_cis(struct pcmcia_socket *s, unsigned int *info)
 {
-    tuple_t *tuple;
-    cisparse_t *p;
-    unsigned int count = 0;
-    int ret, reserved, dev_ok = 0, ident_ok = 0;
+        tuple_t *tuple;
+        cisparse_t *p;
+        unsigned int count = 0;
+        int ret, reserved, dev_ok = 0, ident_ok = 0;
 
-    if (!s)
-        return -EINVAL;
+        if (!s)
+                return -EINVAL;
 
-    /* We do not want to validate the CIS cache... */
-    destroy_cis_cache(s);
+        /* We do not want to validate the CIS cache... */
+        destroy_cis_cache(s);
 
-    tuple = kmalloc(sizeof(*tuple), GFP_KERNEL);
-    if (tuple == NULL) {
-            dev_printk(KERN_WARNING, &s->dev, "no memory to validate CIS\n");
-            return -ENOMEM;
-    }
-    p = kmalloc(sizeof(*p), GFP_KERNEL);
-    if (p == NULL) {
-            kfree(tuple);
-            dev_printk(KERN_WARNING, &s->dev, "no memory to validate CIS\n");
-            return -ENOMEM;
-    }
+        tuple = kmalloc(sizeof(*tuple), GFP_KERNEL);
+        if (tuple == NULL) {
+                dev_warn(&s->dev, "no memory to validate CIS\n");
+                return -ENOMEM;
+        }
+        p = kmalloc(sizeof(*p), GFP_KERNEL);
+        if (p == NULL) {
+                kfree(tuple);
+                dev_warn(&s->dev, "no memory to validate CIS\n");
+                return -ENOMEM;
+        }
 
-    count = reserved = 0;
-    tuple->DesiredTuple = RETURN_FIRST_TUPLE;
-    tuple->Attributes = TUPLE_RETURN_COMMON;
-    ret = pccard_get_first_tuple(s, BIND_FN_ALL, tuple);
-    if (ret != 0)
-        goto done;
-
-    /* First tuple should be DEVICE; we should really have either that
-       or a CFTABLE_ENTRY of some sort */
-    if ((tuple->TupleCode == CISTPL_DEVICE) ||
-        (pccard_read_tuple(s, BIND_FN_ALL, CISTPL_CFTABLE_ENTRY, p) == 0) ||
-        (pccard_read_tuple(s, BIND_FN_ALL, CISTPL_CFTABLE_ENTRY_CB, p) == 0))
-        dev_ok++;
-
-    /* All cards should have a MANFID tuple, and/or a VERS_1 or VERS_2
-       tuple, for card identification.  Certain old D-Link and Linksys
-       cards have only a broken VERS_2 tuple; hence the bogus test. */
-    if ((pccard_read_tuple(s, BIND_FN_ALL, CISTPL_MANFID, p) == 0) ||
-        (pccard_read_tuple(s, BIND_FN_ALL, CISTPL_VERS_1, p) == 0) ||
-        (pccard_read_tuple(s, BIND_FN_ALL, CISTPL_VERS_2, p) != -ENOSPC))
-        ident_ok++;
-
-    if (!dev_ok && !ident_ok)
-        goto done;
-
-    for (count = 1; count < MAX_TUPLES; count++) {
-        ret = pccard_get_next_tuple(s, BIND_FN_ALL, tuple);
+        count = reserved = 0;
+        tuple->DesiredTuple = RETURN_FIRST_TUPLE;
+        tuple->Attributes = TUPLE_RETURN_COMMON;
+        ret = pccard_get_first_tuple(s, BIND_FN_ALL, tuple);
         if (ret != 0)
-                break;
-        if (((tuple->TupleCode > 0x23) && (tuple->TupleCode < 0x40)) ||
-            ((tuple->TupleCode > 0x47) && (tuple->TupleCode < 0x80)) ||
-            ((tuple->TupleCode > 0x90) && (tuple->TupleCode < 0xff)))
-            reserved++;
-    }
-    if ((count == MAX_TUPLES) || (reserved > 5) ||
-        ((!dev_ok || !ident_ok) && (count > 10)))
-        count = 0;
+                goto done;
+
+        /* First tuple should be DEVICE; we should really have either that
+           or a CFTABLE_ENTRY of some sort */
+        if ((tuple->TupleCode == CISTPL_DEVICE) ||
+            (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_CFTABLE_ENTRY, p)) ||
+            (!pccard_read_tuple(s, BIND_FN_ALL, CISTPL_CFTABLE_ENTRY_CB, p)))
+                dev_ok++;
+
+        /* All cards should have a MANFID tuple, and/or a VERS_1 or VERS_2
+           tuple, for card identification.  Certain old D-Link and Linksys
+           cards have only a broken VERS_2 tuple; hence the bogus test. */
+        if ((pccard_read_tuple(s, BIND_FN_ALL, CISTPL_MANFID, p) == 0) ||
+            (pccard_read_tuple(s, BIND_FN_ALL, CISTPL_VERS_1, p) == 0) ||
+            (pccard_read_tuple(s, BIND_FN_ALL, CISTPL_VERS_2, p) != -ENOSPC))
+                ident_ok++;
+
+        if (!dev_ok && !ident_ok)
+                goto done;
+
+        for (count = 1; count < MAX_TUPLES; count++) {
+                ret = pccard_get_next_tuple(s, BIND_FN_ALL, tuple);
+                if (ret != 0)
+                        break;
+                if (((tuple->TupleCode > 0x23) && (tuple->TupleCode < 0x40)) ||
+                    ((tuple->TupleCode > 0x47) && (tuple->TupleCode < 0x80)) ||
+                    ((tuple->TupleCode > 0x90) && (tuple->TupleCode < 0xff)))
+                        reserved++;
+        }
+        if ((count == MAX_TUPLES) || (reserved > 5) ||
+                ((!dev_ok || !ident_ok) && (count > 10)))
+                count = 0;
+
+        ret = 0;
 
 done:
-    /* invalidate CIS cache on failure */
-    if (!dev_ok || !ident_ok || !count)
-            destroy_cis_cache(s);
-
-    if (info)
-            *info = count;
-    kfree(tuple);
-    kfree(p);
-    return 0;
+        /* invalidate CIS cache on failure */
+        if (!dev_ok || !ident_ok || !count) {
+                destroy_cis_cache(s);
+                ret = -EIO;
+        }
+
+        if (info)
+                *info = count;
+        kfree(tuple);
+        kfree(p);
+        return ret;
 }
 EXPORT_SYMBOL(pccard_validate_cis);