linux-kernel - [PATCH] fix plip 2

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Message-ID: <Pine.LNX.4.64.0711222120501.15336@artax.karlin.mff.cuni.cz>
Date:	Thu, 22 Nov 2007 21:26:01 +0100 (CET)
From:	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] fix plip 2

This is my second patch for plip. Plip passes string "name" that is 
allocated on stack to parport_register_device. parport_register_device 
holds the pointer to "name" and when the registering function exits, it 
points nowhere.

On some machine, this bug causes bad names to appear in /proc filesystem, 
such as /proc/sys/dev/parport/parport0/devices/T^/ÁX^/Á, on others, the 
plip proc node is completely missing.

The patch also fixes documentation to note this requirement.

Mikulas

Signed-off-by: Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>

diff -u -r linux-2.6.24-rc2/Documentation/parport-lowlevel.txt linux-2.6.24-test/Documentation/parport-lowlevel.txt
--- linux-2.6.24-rc2/Documentation/parport-lowlevel.txt	2007-11-06 22:57:46.000000000 +0100
+++ linux-2.6.24-test/Documentation/parport-lowlevel.txt	2007-11-22 21:11:28.000000000 +0100
@@ -339,6 +339,10 @@
 ('port').  Once you have done that, you will be able to use
 parport_claim and parport_release in order to use the port.
 
+The ('name') argument is the name of the device that appears in /proc
+filesystem. The string must be valid for the whole lifetime of the
+device (until parport_unregister_device is called).
+
 This function will register three callbacks into your driver:
 'preempt', 'wakeup' and 'irq'.  Each of these may be NULL in order to
 indicate that you do not want a callback.
diff -u -r linux-2.6.24-rc2/drivers/net/plip.c linux-2.6.24-test/drivers/net/plip.c
--- linux-2.6.24-rc2/drivers/net/plip.c	2007-11-06 22:57:46.000000000 +0100
+++ linux-2.6.24-test/drivers/net/plip.c	2007-11-22 21:11:28.000000000 +0100
@@ -1269,7 +1269,7 @@
 
 		nl = netdev_priv(dev);
 		nl->dev = dev;
-		nl->pardev = parport_register_device(port, name, plip_preempt,
+		nl->pardev = parport_register_device(port, dev->name, plip_preempt,
 						 plip_wakeup, plip_interrupt,
 						 0, dev);