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i2c-parport: Fix adapter list handling 

Use a standard list with proper locking to handle the list of
adapters. Thankfully it only matters on systems with more than one
parallel port, which are very rare.

Thanks to Lukasz Kapiec for reporting the problem to me.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: stable@kernel.org
This commit is contained in:
Jean Delvare 2011-05-01 18:18:49 +02:00 committed by Jean Delvare
parent a6e5e2be44
commit 56acc7a39a
1 changed files with 14 additions and 13 deletions
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27
drivers/i2c/busses/i2c-parport.c
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@ -1,7 +1,7 @@
/* ------------------------------------------------------------------------ *
* i2c-parport.c I2C bus over parallel port *
* ------------------------------------------------------------------------ *
Copyright (C) 2003-2010 Jean Delvare <khali@linux-fr.org>
Copyright (C) 2003-2011 Jean Delvare <khali@linux-fr.org>
Based on older i2c-philips-par.c driver
Copyright (C) 1995-2000 Simon G. Vogl
@ -33,6 +33,8 @@
#include <linux/i2c-algo-bit.h>
#include <linux/i2c-smbus.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include "i2c-parport.h"
/* ----- Device list ------------------------------------------------------ */
@ -43,10 +45,11 @@ struct i2c_par {
struct i2c_algo_bit_data algo_data;
struct i2c_smbus_alert_setup alert_data;
struct i2c_client *ara;
struct i2c_par *next;
struct list_head node;
};
static struct i2c_par *adapter_list;
static LIST_HEAD(adapter_list);
static DEFINE_MUTEX(adapter_list_lock);
/* ----- Low-level parallel port access ----------------------------------- */
@ -228,8 +231,9 @@ static void i2c_parport_attach (struct parport *port)
}
/* Add the new adapter to the list */
adapter->next = adapter_list;
adapter_list = adapter;
mutex_lock(&adapter_list_lock);
list_add_tail(&adapter->node, &adapter_list);
mutex_unlock(&adapter_list_lock);
return;
ERROR1:
@ -241,11 +245,11 @@ ERROR0:
static void i2c_parport_detach (struct parport *port)
{
struct i2c_par *adapter, *prev;
struct i2c_par *adapter, *_n;
/* Walk the list */
for (prev = NULL, adapter = adapter_list; adapter;
prev = adapter, adapter = adapter->next) {
mutex_lock(&adapter_list_lock);
list_for_each_entry_safe(adapter, _n, &adapter_list, node) {
if (adapter->pdev->port == port) {
if (adapter->ara) {
parport_disable_irq(port);
@ -259,14 +263,11 @@ static void i2c_parport_detach (struct parport *port)
parport_release(adapter->pdev);
parport_unregister_device(adapter->pdev);
if (prev)
prev->next = adapter->next;
else
adapter_list = adapter->next;
list_del(&adapter->node);
kfree(adapter);
return;
}
}
mutex_unlock(&adapter_list_lock);
}
static struct parport_driver i2c_parport_driver = {