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i2c-parport: Fix a minor race on driver unload

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When unloading the driver, we really want to unregister the i2c adapter
before we power it off, rather than the other way around.

Also speed up the bus a bit when we can sense SCL. The slaves will
stretch the line as needed.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Jean Delvare 2007-05-01 23:26:30 +02:00 committed by Jean Delvare
parent 4b4686e7a6
commit 3af07bd297
1 changed files with 8 additions and 4 deletions
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12
drivers/i2c/busses/i2c-parport.c
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@ -1,7 +1,7 @@
/* ------------------------------------------------------------------------ *
* i2c-parport.c I2C bus over parallel port *
* ------------------------------------------------------------------------ *
Copyright (C) 2003-2004 Jean Delvare <khali@linux-fr.org>
Copyright (C) 2003-2007 Jean Delvare <khali@linux-fr.org>
Based on older i2c-philips-par.c driver
Copyright (C) 1995-2000 Simon G. Vogl
@ -137,7 +137,7 @@ static struct i2c_algo_bit_data parport_algo_data = {
.setscl = parport_setscl,
.getsda = parport_getsda,
.getscl = parport_getscl,
.udelay = 60,
.udelay = 10, /* ~50 kbps */
.timeout = HZ,
};
@ -168,8 +168,11 @@ static void i2c_parport_attach (struct parport *port)
strlcpy(adapter->adapter.name, "Parallel port adapter",
sizeof(adapter->adapter.name));
adapter->algo_data = parport_algo_data;
if (!adapter_parm[type].getscl.val)
/* Slow down if we can't sense SCL */
if (!adapter_parm[type].getscl.val) {
adapter->algo_data.getscl = NULL;
adapter->algo_data.udelay = 50; /* ~10 kbps */
}
adapter->algo_data.data = port;
adapter->adapter.algo_data = &adapter->algo_data;
@ -211,11 +214,12 @@ static void i2c_parport_detach (struct parport *port)
for (prev = NULL, adapter = adapter_list; adapter;
prev = adapter, adapter = adapter->next) {
if (adapter->pdev->port == port) {
i2c_del_adapter(&adapter->adapter);
/* Un-init if needed (power off...) */
if (adapter_parm[type].init.val)
line_set(port, 0, &adapter_parm[type].init);
i2c_del_adapter(&adapter->adapter);
parport_unregister_device(adapter->pdev);
if (prev)
prev->next = adapter->next;