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mmc: use sysfs groups to handle conditional attributes
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Suppressing uevents turned out to be a bad idea as it screws up the
order of events, making user space very confused. Change the system to
use sysfs groups instead.

This is a regression that, for some odd reason, has gone unnoticed for
some time. It confuses hal so that the block devices (which have the
mmc device as a parent) are not registered. End result being that
desktop magic when cards are inserted won't work.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Pierre Ossman authored and Linus Torvalds committed Mar 23, 2008
1 parent 03c086a commit 51ec92e
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Showing 9 changed files with 96 additions and 198 deletions.
2 changes: 1 addition & 1 deletion drivers/mmc/core/Makefile
Original file line number Diff line number Diff line change
Expand Up @@ -7,7 +7,7 @@ ifeq ($(CONFIG_MMC_DEBUG),y)
endif

obj-$(CONFIG_MMC) += mmc_core.o
mmc_core-y := core.o sysfs.o bus.o host.o \
mmc_core-y := core.o bus.o host.o \
mmc.o mmc_ops.o sd.o sd_ops.o \
sdio.o sdio_ops.o sdio_bus.o \
sdio_cis.o sdio_io.o sdio_irq.o
Expand Down
23 changes: 3 additions & 20 deletions drivers/mmc/core/bus.c
Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,6 @@
#include <linux/mmc/card.h>
#include <linux/mmc/host.h>

#include "sysfs.h"
#include "core.h"
#include "sdio_cis.h"
#include "bus.h"
Expand All @@ -43,7 +42,7 @@ static ssize_t mmc_type_show(struct device *dev,
}

static struct device_attribute mmc_dev_attrs[] = {
MMC_ATTR_RO(type),
__ATTR(type, S_IRUGO, mmc_type_show, NULL),
__ATTR_NULL,
};

Expand Down Expand Up @@ -189,7 +188,7 @@ static void mmc_release_card(struct device *dev)
/*
* Allocate and initialise a new MMC card structure.
*/
struct mmc_card *mmc_alloc_card(struct mmc_host *host)
struct mmc_card *mmc_alloc_card(struct mmc_host *host, struct device_type *type)
{
struct mmc_card *card;

Expand All @@ -204,6 +203,7 @@ struct mmc_card *mmc_alloc_card(struct mmc_host *host)
card->dev.parent = mmc_classdev(host);
card->dev.bus = &mmc_bus_type;
card->dev.release = mmc_release_card;
card->dev.type = type;

return card;
}
Expand Down Expand Up @@ -248,24 +248,10 @@ int mmc_add_card(struct mmc_card *card)
type, card->rca);
}

card->dev.uevent_suppress = 1;

ret = device_add(&card->dev);
if (ret)
return ret;

if (card->host->bus_ops->sysfs_add) {
ret = card->host->bus_ops->sysfs_add(card->host, card);
if (ret) {
device_del(&card->dev);
return ret;
}
}

card->dev.uevent_suppress = 0;

kobject_uevent(&card->dev.kobj, KOBJ_ADD);

mmc_card_set_present(card);

return 0;
Expand All @@ -285,9 +271,6 @@ void mmc_remove_card(struct mmc_card *card)
printk(KERN_INFO "%s: card %04x removed\n",
mmc_hostname(card->host), card->rca);
}

if (card->host->bus_ops->sysfs_remove)
card->host->bus_ops->sysfs_remove(card->host, card);
device_del(&card->dev);
}

Expand Down
11 changes: 10 additions & 1 deletion drivers/mmc/core/bus.h
Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,16 @@
#ifndef _MMC_CORE_BUS_H
#define _MMC_CORE_BUS_H

struct mmc_card *mmc_alloc_card(struct mmc_host *host);
#define MMC_DEV_ATTR(name, fmt, args...) \
static ssize_t mmc_##name##_show (struct device *dev, struct device_attribute *attr, char *buf) \
{ \
struct mmc_card *card = container_of(dev, struct mmc_card, dev); \
return sprintf(buf, fmt, args); \
} \
static DEVICE_ATTR(name, S_IRUGO, mmc_##name##_show, NULL)

struct mmc_card *mmc_alloc_card(struct mmc_host *host,
struct device_type *type);
int mmc_add_card(struct mmc_card *card);
void mmc_remove_card(struct mmc_card *card);

Expand Down
2 changes: 0 additions & 2 deletions drivers/mmc/core/core.h
Original file line number Diff line number Diff line change
Expand Up @@ -18,8 +18,6 @@
struct mmc_bus_ops {
void (*remove)(struct mmc_host *);
void (*detect)(struct mmc_host *);
int (*sysfs_add)(struct mmc_host *, struct mmc_card *card);
void (*sysfs_remove)(struct mmc_host *, struct mmc_card *card);
void (*suspend)(struct mmc_host *);
void (*resume)(struct mmc_host *);
};
Expand Down
90 changes: 39 additions & 51 deletions drivers/mmc/core/mmc.c
Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,6 @@
#include <linux/mmc/mmc.h>

#include "core.h"
#include "sysfs.h"
#include "bus.h"
#include "mmc_ops.h"

Expand Down Expand Up @@ -248,6 +247,44 @@ static int mmc_read_ext_csd(struct mmc_card *card)
return err;
}

MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
card->raw_cid[2], card->raw_cid[3]);
MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
card->raw_csd[2], card->raw_csd[3]);
MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);

static struct attribute *mmc_std_attrs[] = {
&dev_attr_cid.attr,
&dev_attr_csd.attr,
&dev_attr_date.attr,
&dev_attr_fwrev.attr,
&dev_attr_hwrev.attr,
&dev_attr_manfid.attr,
&dev_attr_name.attr,
&dev_attr_oemid.attr,
&dev_attr_serial.attr,
NULL,
};

static struct attribute_group mmc_std_attr_group = {
.attrs = mmc_std_attrs,
};

static struct attribute_group *mmc_attr_groups[] = {
&mmc_std_attr_group,
NULL,
};

static struct device_type mmc_type = {
.groups = mmc_attr_groups,
};

/*
* Handle the detection and initialisation of a card.
*
Expand Down Expand Up @@ -308,7 +345,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
/*
* Allocate card structure.
*/
card = mmc_alloc_card(host);
card = mmc_alloc_card(host, &mmc_type);
if (IS_ERR(card)) {
err = PTR_ERR(card);
goto err;
Expand Down Expand Up @@ -459,53 +496,6 @@ static void mmc_detect(struct mmc_host *host)
}
}

MMC_ATTR_FN(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
card->raw_cid[2], card->raw_cid[3]);
MMC_ATTR_FN(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
card->raw_csd[2], card->raw_csd[3]);
MMC_ATTR_FN(date, "%02d/%04d\n", card->cid.month, card->cid.year);
MMC_ATTR_FN(fwrev, "0x%x\n", card->cid.fwrev);
MMC_ATTR_FN(hwrev, "0x%x\n", card->cid.hwrev);
MMC_ATTR_FN(manfid, "0x%06x\n", card->cid.manfid);
MMC_ATTR_FN(name, "%s\n", card->cid.prod_name);
MMC_ATTR_FN(oemid, "0x%04x\n", card->cid.oemid);
MMC_ATTR_FN(serial, "0x%08x\n", card->cid.serial);

static struct device_attribute mmc_dev_attrs[] = {
MMC_ATTR_RO(cid),
MMC_ATTR_RO(csd),
MMC_ATTR_RO(date),
MMC_ATTR_RO(fwrev),
MMC_ATTR_RO(hwrev),
MMC_ATTR_RO(manfid),
MMC_ATTR_RO(name),
MMC_ATTR_RO(oemid),
MMC_ATTR_RO(serial),
__ATTR_NULL,
};

/*
* Adds sysfs entries as relevant.
*/
static int mmc_sysfs_add(struct mmc_host *host, struct mmc_card *card)
{
int ret;

ret = mmc_add_attrs(card, mmc_dev_attrs);
if (ret < 0)
return ret;

return 0;
}

/*
* Removes the sysfs entries added by mmc_sysfs_add().
*/
static void mmc_sysfs_remove(struct mmc_host *host, struct mmc_card *card)
{
mmc_remove_attrs(card, mmc_dev_attrs);
}

#ifdef CONFIG_MMC_UNSAFE_RESUME

/*
Expand Down Expand Up @@ -560,8 +550,6 @@ static void mmc_resume(struct mmc_host *host)
static const struct mmc_bus_ops mmc_ops = {
.remove = mmc_remove,
.detect = mmc_detect,
.sysfs_add = mmc_sysfs_add,
.sysfs_remove = mmc_sysfs_remove,
.suspend = mmc_suspend,
.resume = mmc_resume,
};
Expand Down
95 changes: 42 additions & 53 deletions drivers/mmc/core/sd.c
Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,6 @@
#include <linux/mmc/sd.h>

#include "core.h"
#include "sysfs.h"
#include "bus.h"
#include "mmc_ops.h"
#include "sd_ops.h"
Expand Down Expand Up @@ -283,6 +282,47 @@ static int mmc_switch_hs(struct mmc_card *card)
return err;
}

MMC_DEV_ATTR(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
card->raw_cid[2], card->raw_cid[3]);
MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
card->raw_csd[2], card->raw_csd[3]);
MMC_DEV_ATTR(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);


static struct attribute *sd_std_attrs[] = {
&dev_attr_cid.attr,
&dev_attr_csd.attr,
&dev_attr_scr.attr,
&dev_attr_date.attr,
&dev_attr_fwrev.attr,
&dev_attr_hwrev.attr,
&dev_attr_manfid.attr,
&dev_attr_name.attr,
&dev_attr_oemid.attr,
&dev_attr_serial.attr,
NULL,
};

static struct attribute_group sd_std_attr_group = {
.attrs = sd_std_attrs,
};

static struct attribute_group *sd_attr_groups[] = {
&sd_std_attr_group,
NULL,
};

static struct device_type sd_type = {
.groups = sd_attr_groups,
};

/*
* Handle the detection and initialisation of a card.
*
Expand Down Expand Up @@ -352,7 +392,7 @@ static int mmc_sd_init_card(struct mmc_host *host, u32 ocr,
/*
* Allocate card structure.
*/
card = mmc_alloc_card(host);
card = mmc_alloc_card(host, &sd_type);
if (IS_ERR(card)) {
err = PTR_ERR(card);
goto err;
Expand Down Expand Up @@ -518,55 +558,6 @@ static void mmc_sd_detect(struct mmc_host *host)
}
}

MMC_ATTR_FN(cid, "%08x%08x%08x%08x\n", card->raw_cid[0], card->raw_cid[1],
card->raw_cid[2], card->raw_cid[3]);
MMC_ATTR_FN(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
card->raw_csd[2], card->raw_csd[3]);
MMC_ATTR_FN(scr, "%08x%08x\n", card->raw_scr[0], card->raw_scr[1]);
MMC_ATTR_FN(date, "%02d/%04d\n", card->cid.month, card->cid.year);
MMC_ATTR_FN(fwrev, "0x%x\n", card->cid.fwrev);
MMC_ATTR_FN(hwrev, "0x%x\n", card->cid.hwrev);
MMC_ATTR_FN(manfid, "0x%06x\n", card->cid.manfid);
MMC_ATTR_FN(name, "%s\n", card->cid.prod_name);
MMC_ATTR_FN(oemid, "0x%04x\n", card->cid.oemid);
MMC_ATTR_FN(serial, "0x%08x\n", card->cid.serial);

static struct device_attribute mmc_sd_dev_attrs[] = {
MMC_ATTR_RO(cid),
MMC_ATTR_RO(csd),
MMC_ATTR_RO(scr),
MMC_ATTR_RO(date),
MMC_ATTR_RO(fwrev),
MMC_ATTR_RO(hwrev),
MMC_ATTR_RO(manfid),
MMC_ATTR_RO(name),
MMC_ATTR_RO(oemid),
MMC_ATTR_RO(serial),
__ATTR_NULL,
};

/*
* Adds sysfs entries as relevant.
*/
static int mmc_sd_sysfs_add(struct mmc_host *host, struct mmc_card *card)
{
int ret;

ret = mmc_add_attrs(card, mmc_sd_dev_attrs);
if (ret < 0)
return ret;

return 0;
}

/*
* Removes the sysfs entries added by mmc_sysfs_add().
*/
static void mmc_sd_sysfs_remove(struct mmc_host *host, struct mmc_card *card)
{
mmc_remove_attrs(card, mmc_sd_dev_attrs);
}

#ifdef CONFIG_MMC_UNSAFE_RESUME

/*
Expand Down Expand Up @@ -621,8 +612,6 @@ static void mmc_sd_resume(struct mmc_host *host)
static const struct mmc_bus_ops mmc_sd_ops = {
.remove = mmc_sd_remove,
.detect = mmc_sd_detect,
.sysfs_add = mmc_sd_sysfs_add,
.sysfs_remove = mmc_sd_sysfs_remove,
.suspend = mmc_sd_suspend,
.resume = mmc_sd_resume,
};
Expand Down
2 changes: 1 addition & 1 deletion drivers/mmc/core/sdio.c
Original file line number Diff line number Diff line change
Expand Up @@ -287,7 +287,7 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
/*
* Allocate card structure.
*/
card = mmc_alloc_card(host);
card = mmc_alloc_card(host, NULL);
if (IS_ERR(card)) {
err = PTR_ERR(card);
goto err;
Expand Down
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