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>

drivers/pcmcia/cistpl.c

@@ -1577,16 +1577,19 @@ 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;
@@ -1602,13 +1605,13 @@ int pccard_validate_cis(struct pcmcia_socket *s, unsigned int *info)
 
 	tuple = kmalloc(sizeof(*tuple), GFP_KERNEL);
 	if (tuple == NULL) {
-	    dev_printk(KERN_WARNING, &s->dev, "no memory to validate CIS\n");
+		dev_warn(&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");
+		dev_warn(&s->dev, "no memory to validate CIS\n");
 		return -ENOMEM;
 	}
 
@@ -1622,8 +1625,8 @@ int pccard_validate_cis(struct pcmcia_socket *s, unsigned int *info)
 	/* 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))
+	    (!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
@@ -1650,15 +1653,19 @@ int pccard_validate_cis(struct pcmcia_socket *s, unsigned int *info)
 		((!dev_ok || !ident_ok) && (count > 10)))
 		count = 0;
 
+	ret = 0;
+
 done:
 	/* invalidate CIS cache on failure */
-    if (!dev_ok || !ident_ok || !count)
+	if (!dev_ok || !ident_ok || !count) {
 		destroy_cis_cache(s);
+		ret = -EIO;
+	}
 
 	if (info)
 		*info = count;
 	kfree(tuple);
 	kfree(p);
-    return 0;
+	return ret;
 }
 EXPORT_SYMBOL(pccard_validate_cis);