We need a single mutex for all 4 shared SMBus ports on the SB800. A
per-port mutex doesn't protect us from concurrent access.
In theory the mutex should be per PCI device, however in practice we
know that there's only ever a single instance of the device in a given
system so we can use a global.
Also take the mutex during initialization, as first port may be already
in use when second port is initialized.
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Tested-by: Christian Fetzer <fetzer.ch@gmail.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
[wsa: made mutex static]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
+static DEFINE_MUTEX(piix4_mutex_sb800);
static const char *piix4_main_port_names_sb800[PIIX4_MAX_ADAPTERS] = {
"SDA0", "SDA2", "SDA3", "SDA4"
};
static const char *piix4_main_port_names_sb800[PIIX4_MAX_ADAPTERS] = {
"SDA0", "SDA2", "SDA3", "SDA4"
};
/* SB800 */
bool sb800_main;
unsigned short port;
/* SB800 */
bool sb800_main;
unsigned short port;
};
static int piix4_setup(struct pci_dev *PIIX4_dev,
};
static int piix4_setup(struct pci_dev *PIIX4_dev,
else
smb_en = (aux) ? 0x28 : 0x2c;
else
smb_en = (aux) ? 0x28 : 0x2c;
+ mutex_lock(&piix4_mutex_sb800);
outb_p(smb_en, SB800_PIIX4_SMB_IDX);
smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
outb_p(smb_en + 1, SB800_PIIX4_SMB_IDX);
smba_en_hi = inb_p(SB800_PIIX4_SMB_IDX + 1);
outb_p(smb_en, SB800_PIIX4_SMB_IDX);
smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
outb_p(smb_en + 1, SB800_PIIX4_SMB_IDX);
smba_en_hi = inb_p(SB800_PIIX4_SMB_IDX + 1);
+ mutex_unlock(&piix4_mutex_sb800);
if (!smb_en) {
smb_en_status = smba_en_lo & 0x10;
if (!smb_en) {
smb_en_status = smba_en_lo & 0x10;
- mutex_lock(adapdata->mutex);
+ mutex_lock(&piix4_mutex_sb800);
outb_p(SB800_PIIX4_PORT_IDX, SB800_PIIX4_SMB_IDX);
smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
outb_p(SB800_PIIX4_PORT_IDX, SB800_PIIX4_SMB_IDX);
smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
outb_p(smba_en_lo, SB800_PIIX4_SMB_IDX + 1);
outb_p(smba_en_lo, SB800_PIIX4_SMB_IDX + 1);
- mutex_unlock(adapdata->mutex);
+ mutex_unlock(&piix4_mutex_sb800);
static int piix4_add_adapters_sb800(struct pci_dev *dev, unsigned short smba)
{
static int piix4_add_adapters_sb800(struct pci_dev *dev, unsigned short smba)
{
struct i2c_piix4_adapdata *adapdata;
int port;
int retval;
struct i2c_piix4_adapdata *adapdata;
int port;
int retval;
- mutex = kzalloc(sizeof(*mutex), GFP_KERNEL);
- if (mutex == NULL)
- return -ENOMEM;
-
- mutex_init(mutex);
-
for (port = 0; port < PIIX4_MAX_ADAPTERS; port++) {
retval = piix4_add_adapter(dev, smba,
piix4_main_port_names_sb800[port],
for (port = 0; port < PIIX4_MAX_ADAPTERS; port++) {
retval = piix4_add_adapter(dev, smba,
piix4_main_port_names_sb800[port],
adapdata = i2c_get_adapdata(piix4_main_adapters[port]);
adapdata->sb800_main = true;
adapdata->port = port;
adapdata = i2c_get_adapdata(piix4_main_adapters[port]);
adapdata->sb800_main = true;
adapdata->port = port;
- adapdata->mutex = mutex;
i2c_del_adapter(adap);
if (adapdata->port == 0) {
release_region(adapdata->smba, SMBIOSIZE);
i2c_del_adapter(adap);
if (adapdata->port == 0) {
release_region(adapdata->smba, SMBIOSIZE);
- if (adapdata->sb800_main) {
- kfree(adapdata->mutex);
+ if (adapdata->sb800_main)
release_region(SB800_PIIX4_SMB_IDX, 2);
release_region(SB800_PIIX4_SMB_IDX, 2);
}
kfree(adapdata);
kfree(adap);
}
kfree(adapdata);
kfree(adap);