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From: Alan Cox <alan@redhat.com>
Subject: [PATCH 01/76] drivers/serial/crisv10.c: add missing put_tty_driver
To: linux-kernel@vger.kernel.org
Date: Sun, 05 Oct 2008 17:04:39 +0100
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From: Julia Lawall <julia@diku.dk>

alloc_tty_driver is called at the beginning of the function containing the
lines of code shown in the patch.  Thus, put_tty_driver is needed before
returning in the error handling code.

The semantic match that finds this problem is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@nr exists@
local idexpression x;
expression E,f;
position p1,p2,p3;
identifier l;
statement S;
@@

x = alloc_tty_driver@p1(...)
...
if (x == NULL) S
... when != E = x
    when != put_tty_driver(x)
    when != goto l;
(
return \(0\|x\);
|
return@p3 ...;
)

@script:python@
p1 << nr.p1;
p3 << nr.p3;
@@

print "%s: call on line %s not freed or saved before return on line %s" % (p1[0].file,p1[0].line,p3[0].line)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Alan Cox <alan@redhat.com>
---

 drivers/serial/crisv10.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/serial/crisv10.c b/drivers/serial/crisv10.c
index bf94a77..a467c77 100644
--- a/drivers/serial/crisv10.c
+++ b/drivers/serial/crisv10.c
@@ -4419,6 +4419,7 @@ rs_init(void)
 			rs485_pa_bit)) {
 		printk(KERN_CRIT "ETRAX100LX serial: Could not allocate "
 			"RS485 pin\n");
+		put_tty_driver(driver);
 		return -EBUSY;
 	}
 #endif
@@ -4427,6 +4428,7 @@ rs_init(void)
 			rs485_port_g_bit)) {
 		printk(KERN_CRIT "ETRAX100LX serial: Could not allocate "
 			"RS485 pin\n");
+		put_tty_driver(driver);
 		return -EBUSY;
 	}
 #endif

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