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mmc: slot-gpio: Rework how to handle allocation of slot-gpio data 

By moving the allocation of the slot-gpio data into mmc_alloc_host(),
we can remove the slot-gpio internal calls to mmc_gpio_alloc().

This means mmc_gpio_alloc() has now only one caller left, which
consequence allow us to simplify and remove some of the slot-gpio code.

Additionally, this makes the slot-gpio mutex redundant, so let's remove
it.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Ulf Hansson 2014-12-18 15:44:36 +01:00
parent e2d1926bad
commit df8aca162e
3 changed files with 22 additions and 60 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/mmc/core/host.c
View File

@ -29,6 +29,7 @@
#include "core.h"
#include "host.h"
#include "slot-gpio.h"
#define cls_dev_to_mmc_host(d) container_of(d, struct mmc_host, class_dev)
@ -38,7 +39,6 @@ static DEFINE_SPINLOCK(mmc_host_lock);
static void mmc_host_classdev_release(struct device *dev)
{
struct mmc_host *host = cls_dev_to_mmc_host(dev);
mutex_destroy(&host->slot.lock);
spin_lock(&mmc_host_lock);
idr_remove(&mmc_host_idr, host->index);
spin_unlock(&mmc_host_lock);
@ -478,8 +478,10 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
host->index = err;
spin_unlock(&mmc_host_lock);
idr_preload_end();
if (err < 0)
goto free;
if (err < 0) {
kfree(host);
return NULL;
}
dev_set_name(&host->class_dev, "mmc%d", host->index);
@ -488,10 +490,12 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
host->class_dev.class = &mmc_host_class;
device_initialize(&host->class_dev);
mmc_host_clk_init(host);
if (mmc_gpio_alloc(host)) {
put_device(&host->class_dev);
return NULL;
}
mutex_init(&host->slot.lock);
host->slot.cd_irq = -EINVAL;
mmc_host_clk_init(host);
spin_lock_init(&host->lock);
init_waitqueue_head(&host->wq);
@ -512,10 +516,6 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
host->max_blk_count = PAGE_CACHE_SIZE / 512;
return host;
free:
kfree(host);
return NULL;
}
EXPORT_SYMBOL(mmc_alloc_host);

60
drivers/mmc/core/slot-gpio.c
View File

@ -43,29 +43,17 @@ static irqreturn_t mmc_gpio_cd_irqt(int irq, void *dev_id)
int mmc_gpio_alloc(struct mmc_host *host)
{
size_t len = strlen(dev_name(host->parent)) + 4;
struct mmc_gpio *ctx;
struct mmc_gpio *ctx = devm_kzalloc(host->parent,
sizeof(*ctx) + 2 * len, GFP_KERNEL);
mutex_lock(&host->slot.lock);
ctx = host->slot.handler_priv;
if (!ctx) {
/*
* devm_kzalloc() can be called after device_initialize(), even
* before device_add(), i.e., between mmc_alloc_host() and
* mmc_add_host()
*/
ctx = devm_kzalloc(host->parent, sizeof(*ctx) + 2 * len,
GFP_KERNEL);
if (ctx) {
ctx->ro_label = ctx->cd_label + len;
snprintf(ctx->cd_label, len, "%s cd", dev_name(host->parent));
snprintf(ctx->ro_label, len, "%s ro", dev_name(host->parent));
host->slot.handler_priv = ctx;
}
if (ctx) {
ctx->ro_label = ctx->cd_label + len;
snprintf(ctx->cd_label, len, "%s cd", dev_name(host->parent));
snprintf(ctx->ro_label, len, "%s ro", dev_name(host->parent));
host->slot.handler_priv = ctx;
host->slot.cd_irq = -EINVAL;
}
mutex_unlock(&host->slot.lock);
return ctx ? 0 : -ENOMEM;
}
@ -111,18 +99,12 @@ EXPORT_SYMBOL(mmc_gpio_get_cd);
*/
int mmc_gpio_request_ro(struct mmc_host *host, unsigned int gpio)
{
struct mmc_gpio *ctx;
struct mmc_gpio *ctx = host->slot.handler_priv;
int ret;
if (!gpio_is_valid(gpio))
return -EINVAL;
ret = mmc_gpio_alloc(host);
if (ret < 0)
return ret;
ctx = host->slot.handler_priv;
ret = devm_gpio_request_one(host->parent, gpio, GPIOF_DIR_IN,
ctx->ro_label);
if (ret < 0)
@ -187,15 +169,9 @@ EXPORT_SYMBOL(mmc_gpiod_request_cd_irq);
int mmc_gpio_request_cd(struct mmc_host *host, unsigned int gpio,
unsigned int debounce)
{
struct mmc_gpio *ctx;
struct mmc_gpio *ctx = host->slot.handler_priv;
int ret;
ret = mmc_gpio_alloc(host);
if (ret < 0)
return ret;
ctx = host->slot.handler_priv;
ret = devm_gpio_request_one(host->parent, gpio, GPIOF_DIR_IN,
ctx->cd_label);
if (ret < 0)
@ -239,16 +215,10 @@ int mmc_gpiod_request_cd(struct mmc_host *host, const char *con_id,
unsigned int idx, bool override_active_level,
unsigned int debounce, bool *gpio_invert)
{
struct mmc_gpio *ctx;
struct mmc_gpio *ctx = host->slot.handler_priv;
struct gpio_desc *desc;
int ret;
ret = mmc_gpio_alloc(host);
if (ret < 0)
return ret;
ctx = host->slot.handler_priv;
if (!con_id)
con_id = ctx->cd_label;
@ -291,16 +261,10 @@ int mmc_gpiod_request_ro(struct mmc_host *host, const char *con_id,
unsigned int idx, bool override_active_level,
unsigned int debounce, bool *gpio_invert)
{
struct mmc_gpio *ctx;
struct mmc_gpio *ctx = host->slot.handler_priv;
struct gpio_desc *desc;
int ret;
ret = mmc_gpio_alloc(host);
if (ret < 0)
return ret;
ctx = host->slot.handler_priv;
if (!con_id)
con_id = ctx->ro_label;

2
include/linux/mmc/host.h
View File

@ -166,7 +166,6 @@ struct mmc_async_req {
* struct mmc_slot - MMC slot functions
*
* @cd_irq: MMC/SD-card slot hotplug detection IRQ or -EINVAL
* @lock: protect the @handler_priv pointer
* @handler_priv: MMC/SD-card slot context
*
* Some MMC/SD host controllers implement slot-functions like card and
@ -176,7 +175,6 @@ struct mmc_async_req {
*/
struct mmc_slot {
int cd_irq;
struct mutex lock;
void *handler_priv;
};