linux-kernel - [BUG][PATCH][pcmcia] cisinfo_t removal prevents card detection

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Message-ID: <487CA577.5090602@misterjones.org>
Date:	Tue, 15 Jul 2008 15:26:15 +0200
From:	Marc Zyngier <maz@...terjones.org>
To:	Dominik Brodowski <linux@...inikbrodowski.net>,
	linux-kernel@...r.kernel.org
Subject: [BUG][PATCH][pcmcia] cisinfo_t removal prevents card detection

Dominik,

The commit

c5081d5f4775b2a3f858f91151bbf9163e473075 (pcmcia: simplify pccard_validate_cis)

that entered mainline yesterday introduced a bug that prevents card detection
on my platform (PXA255 based), and possibly others :

   @@ -1490,11 +1491,13 @@ int pccard_validate_cis(struct pcmcia_socket *s, unsigned int function, cisinfo_
               ((tuple->TupleCode > 0x90) && (tuple->TupleCode < 0xff)))
               reserved++;
        }
   -    if ((info->Chains == MAX_TUPLES) || (reserved > 5) ||
   -       ((!dev_ok || !ident_ok) && (info->Chains > 10)))
   -       info->Chains = 0;
   +    if ((count) || (reserved > 5) ||
   +       ((!dev_ok || !ident_ok) && (count > 10)))
   +       count = 0;

Since count starts at 1, condition is now always true, and count then
reset to 0. Restoring the comparaison to MAX_TUPLES makes everybody
happy...

	M.

Signed-off-by: Marc Zyngier <marc.zyngier@...ran.com>

diff --git a/drivers/pcmcia/cistpl.c b/drivers/pcmcia/cistpl.c
index 9fcff0c..65129b5 100644
--- a/drivers/pcmcia/cistpl.c
+++ b/drivers/pcmcia/cistpl.c
@@ -1490,7 +1490,7 @@ int pccard_validate_cis(struct pcmcia_socket *s, unsigned int function, unsigned
  	    ((tuple->TupleCode > 0x90) && (tuple->TupleCode < 0xff)))
  	    reserved++;
      }
-    if ((count) || (reserved > 5) ||
+    if ((count == MAX_TUPLES) || (reserved > 5) ||
  	((!dev_ok || !ident_ok) && (count > 10)))
  	count = 0;

-- 
A rat a day keeps the plague away.
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