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iwlagn: introduce struct iwl-shared - known by all layers

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This struct will hold pointers to all the layers, so that every layer will find
the pointers it needs when calling another layer.

Note that the drv_data set to struct device is now a pointer to
struct iwl_shared.
This solves of bug that I introduced in

	iwlagn: simplify the bus architecture

Bug description:

sysfs gets the the driver data from struct device. Till the aforementioned
patch, dev_get_drvdata would return iwl_priv. After the patch, dev_get_drvdata
return iwl_bus which is buggy since the sysfs handlers rely on this value, and
sysfs handlers need iwl_priv.

Now, dev_get_drvdata return iwl-shared. Since we have pointers to all the
layers in iwl_shared, every layer will be able to get the pointer it needs:
bus layer will gets iwl_bus from the PCI suspend callbacks, and the sysfs
handlers will get the iwl_priv they need.

In order to keep good encapsulation, we need to avoid to dereference iwl_priv
from a different layer. This is why instead of including iwl-dev.h from
iwl-shared.h, I added a forward declaration to iwl_priv. Moreover we keep type
safety while providing encapsulation.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Emmanuel Grumbach 2011-08-25 23:10:37 -07:00 committed by John W. Linville
parent 48f20d354e
commit cac988a682
5 changed files with 50 additions and 23 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
drivers/net/wireless/iwlwifi/iwl-agn.c
View file

@ -473,14 +473,15 @@ static void iwl_bg_tx_flush(struct work_struct *work)
static ssize_t show_debug_level(struct device *d,
struct device_attribute *attr, char *buf)
{
struct iwl_priv *priv = dev_get_drvdata(d);
return sprintf(buf, "0x%08X\n", iwl_get_debug_level(priv));
struct iwl_shared *shrd = dev_get_drvdata(d);
return sprintf(buf, "0x%08X\n", iwl_get_debug_level(shrd->priv));
}
static ssize_t store_debug_level(struct device *d,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct iwl_priv *priv = dev_get_drvdata(d);
struct iwl_shared *shrd = dev_get_drvdata(d);
struct iwl_priv *priv = shrd->priv;
unsigned long val;
int ret;
@ -506,7 +507,8 @@ static DEVICE_ATTR(debug_level, S_IWUSR | S_IRUGO,
static ssize_t show_temperature(struct device *d,
struct device_attribute *attr, char *buf)
{
struct iwl_priv *priv = dev_get_drvdata(d);
struct iwl_shared *shrd = dev_get_drvdata(d);
struct iwl_priv *priv = shrd->priv;
if (!iwl_is_alive(priv))
return -EAGAIN;
@ -3603,7 +3605,10 @@ int iwl_probe(struct iwl_bus *bus, struct iwl_cfg *cfg)
priv = hw->priv;
priv->bus = bus;
bus_set_drv_data(priv->bus, priv);
priv->shrd = &priv->_shrd;
priv->shrd->bus = bus;
priv->shrd->priv = priv;
bus_set_drv_data(priv->bus, priv->shrd);
/* At this point both hw and priv are allocated. */

12
drivers/net/wireless/iwlwifi/iwl-bus.h
View file

@ -63,13 +63,14 @@
#ifndef __iwl_pci_h__
#define __iwl_pci_h__
struct iwl_shared;
struct iwl_bus;
/**
* struct iwl_bus_ops - bus specific operations
* @get_pm_support: must returns true if the bus can go to sleep
* @apm_config: will be called during the config of the APM configuration
* @set_drv_data: set the drv_data pointer to the bus layer
* @set_drv_data: set the shared data pointer to the bus layer
* @get_hw_id: prints the hw_id in the provided buffer
* @write8: write a byte to register at offset ofs
* @write32: write a dword to register at offset ofs
@ -78,7 +79,7 @@ struct iwl_bus;
struct iwl_bus_ops {
bool (*get_pm_support)(struct iwl_bus *bus);
void (*apm_config)(struct iwl_bus *bus);
void (*set_drv_data)(struct iwl_bus *bus, void *drv_data);
void (*set_drv_data)(struct iwl_bus *bus, struct iwl_shared *shrd);
void (*get_hw_id)(struct iwl_bus *bus, char buf[], int buf_len);
void (*write8)(struct iwl_bus *bus, u32 ofs, u8 val);
void (*write32)(struct iwl_bus *bus, u32 ofs, u32 val);
@ -87,9 +88,9 @@ struct iwl_bus_ops {
struct iwl_bus {
/* Common data to all buses */
void *drv_data; /* driver's context */
struct device *dev;
struct iwl_bus_ops *ops;
struct iwl_shared *shrd;
unsigned int irq;
@ -108,9 +109,10 @@ static inline void bus_apm_config(struct iwl_bus *bus)
bus->ops->apm_config(bus);
}
static inline void bus_set_drv_data(struct iwl_bus *bus, void *drv_data)
static inline void bus_set_drv_data(struct iwl_bus *bus,
struct iwl_shared *shrd)
{
bus->ops->set_drv_data(bus, drv_data);
bus->ops->set_drv_data(bus, shrd);
}
static inline void bus_get_hw_id(struct iwl_bus *bus, char buf[], int buf_len)

4
drivers/net/wireless/iwlwifi/iwl-dev.h
View file

@ -1210,6 +1210,10 @@ struct iwl_testmode_trace {
struct iwl_priv {
/*data shared among all the driver's layers */
struct iwl_shared _shrd;
struct iwl_shared *shrd;
/* ieee device used by generic ieee processing code */
struct ieee80211_hw *hw;
struct ieee80211_channel *ieee_channels;

26
drivers/net/wireless/iwlwifi/iwl-pci.c
View file

@ -123,21 +123,21 @@ static void iwl_pci_apm_config(struct iwl_bus *bus)
if ((lctl & PCI_CFG_LINK_CTRL_VAL_L1_EN) ==
PCI_CFG_LINK_CTRL_VAL_L1_EN) {
/* L1-ASPM enabled; disable(!) L0S */
iwl_set_bit(bus->drv_data, CSR_GIO_REG,
iwl_set_bit(priv(bus), CSR_GIO_REG,
CSR_GIO_REG_VAL_L0S_ENABLED);
dev_printk(KERN_INFO, bus->dev, "L1 Enabled; Disabling L0S\n");
} else {
/* L1-ASPM disabled; enable(!) L0S */
iwl_clear_bit(bus->drv_data, CSR_GIO_REG,
iwl_clear_bit(priv(bus), CSR_GIO_REG,
CSR_GIO_REG_VAL_L0S_ENABLED);
dev_printk(KERN_INFO, bus->dev, "L1 Disabled; Enabling L0S\n");
}
}
static void iwl_pci_set_drv_data(struct iwl_bus *bus, void *drv_data)
static void iwl_pci_set_drv_data(struct iwl_bus *bus, struct iwl_shared *shrd)
{
bus->drv_data = drv_data;
pci_set_drvdata(IWL_BUS_GET_PCI_DEV(bus), drv_data);
bus->shrd = shrd;
pci_set_drvdata(IWL_BUS_GET_PCI_DEV(bus), shrd);
}
static void iwl_pci_get_hw_id(struct iwl_bus *bus, char buf[],
@ -496,12 +496,12 @@ static void iwl_pci_down(struct iwl_bus *bus)
static void __devexit iwl_pci_remove(struct pci_dev *pdev)
{
struct iwl_priv *priv = pci_get_drvdata(pdev);
void *bus_specific = priv->bus->bus_specific;
struct iwl_shared *shrd = pci_get_drvdata(pdev);
struct iwl_bus *bus = shrd->bus;
iwl_remove(priv);
iwl_remove(shrd->priv);
iwl_pci_down(bus_specific);
iwl_pci_down(bus);
}
#ifdef CONFIG_PM
@ -509,20 +509,20 @@ static void __devexit iwl_pci_remove(struct pci_dev *pdev)
static int iwl_pci_suspend(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct iwl_priv *priv = pci_get_drvdata(pdev);
struct iwl_shared *shrd = pci_get_drvdata(pdev);
/* Before you put code here, think about WoWLAN. You cannot check here
* whether WoWLAN is enabled or not, and your code will run even if
* WoWLAN is enabled - don't kill the NIC, someone may need it in Sx.
*/
return iwl_suspend(priv);
return iwl_suspend(shrd->priv);
}
static int iwl_pci_resume(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct iwl_priv *priv = pci_get_drvdata(pdev);
struct iwl_shared *shrd = pci_get_drvdata(pdev);
/* Before you put code here, think about WoWLAN. You cannot check here
* whether WoWLAN is enabled or not, and your code will run even if
@ -535,7 +535,7 @@ static int iwl_pci_resume(struct device *device)
*/
pci_write_config_byte(pdev, PCI_CFG_RETRY_TIMEOUT, 0x00);
return iwl_resume(priv);
return iwl_resume(shrd->priv);
}
static SIMPLE_DEV_PM_OPS(iwl_dev_pm_ops, iwl_pci_suspend, iwl_pci_resume);

16
drivers/net/wireless/iwlwifi/iwl-shared.h
View file

@ -64,6 +64,7 @@
#define __iwl_shared_h__
struct iwl_cfg;
struct iwl_bus;
struct iwl_priv;
extern struct iwl_mod_params iwlagn_mod_params;
@ -89,6 +90,21 @@ struct iwl_mod_params {
int wanted_ucode_alternative;
};
/**
* struct iwl_shared - shared fields for all the layers of the driver
*
* @bus: pointer to the bus layer data
* @priv: pointer to the upper layer data
*/
struct iwl_shared {
struct iwl_bus *bus;
struct iwl_priv *priv;
};
/*Whatever _m is (iwl_trans, iwl_priv, iwl_bus, these macros will work */
#define priv(_m) ((_m)->shrd->priv)
#define bus(_m) ((_m)->shrd->bus)
#ifdef CONFIG_PM
int iwl_suspend(struct iwl_priv *priv);
int iwl_resume(struct iwl_priv *priv);