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authorNicolas Pitre <nico@fluxnic.net>2009-09-22 16:45:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-23 07:39:38 -0700
commit95cdfb72b9bc568803f395c266152c71b034b461 (patch)
treeba4d10ee9eb595398d14cf44b433b82ea7802996 /drivers/mmc/core
parent17d33e14f7ffc05f8c81e4a3bdb9a8003a05dcce (diff)
downloadop-kernel-dev-95cdfb72b9bc568803f395c266152c71b034b461.zip
op-kernel-dev-95cdfb72b9bc568803f395c266152c71b034b461.tar.gz
mmc: propagate error codes back from bus drivers' suspend/resume methods
Especially for SDIO drivers which may have special conditions/errors to report, it is a good thing to relay the returned error code back to upper layers. This also allows for the rationalization of the resume path where code to "remove" a no-longer-existing or replaced card was duplicated into the MMC, SD and SDIO bus drivers. In the SDIO case, if a function suspend method returns an error, then all previously suspended functions are resumed and the error returned. An exception is made for -ENOSYS which the core interprets as "we don't support suspend so just kick the card out for suspend and return success". When resuming SDIO cards, the core code only validates the manufacturer and product IDs to make sure the same kind of card is still present before invoking functions resume methods. It's the function driver's responsibility to perform further tests to confirm that the actual same card is present (same MAC address, etc.) and return an error otherwise. Signed-off-by: Nicolas Pitre <nico@marvell.com> Cc: <linux-mmc@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/mmc/core')
-rw-r--r--drivers/mmc/core/core.c35
-rw-r--r--drivers/mmc/core/core.h4
-rw-r--r--drivers/mmc/core/mmc.c15
-rw-r--r--drivers/mmc/core/sd.c15
-rw-r--r--drivers/mmc/core/sdio.c54
5 files changed, 69 insertions, 54 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 0842f68..7dab2e5 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1236,6 +1236,8 @@ EXPORT_SYMBOL(mmc_card_can_sleep);
*/
int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
{
+ int err = 0;
+
if (host->caps & MMC_CAP_DISABLE)
cancel_delayed_work(&host->disable);
cancel_delayed_work(&host->detect);
@@ -1244,21 +1246,26 @@ int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
mmc_bus_get(host);
if (host->bus_ops && !host->bus_dead) {
if (host->bus_ops->suspend)
- host->bus_ops->suspend(host);
- if (!host->bus_ops->resume) {
+ err = host->bus_ops->suspend(host);
+ if (err == -ENOSYS || !host->bus_ops->resume) {
+ /*
+ * We simply "remove" the card in this case.
+ * It will be redetected on resume.
+ */
if (host->bus_ops->remove)
host->bus_ops->remove(host);
-
mmc_claim_host(host);
mmc_detach_bus(host);
mmc_release_host(host);
+ err = 0;
}
}
mmc_bus_put(host);
- mmc_power_off(host);
+ if (!err)
+ mmc_power_off(host);
- return 0;
+ return err;
}
EXPORT_SYMBOL(mmc_suspend_host);
@@ -1269,12 +1276,26 @@ EXPORT_SYMBOL(mmc_suspend_host);
*/
int mmc_resume_host(struct mmc_host *host)
{
+ int err = 0;
+
mmc_bus_get(host);
if (host->bus_ops && !host->bus_dead) {
mmc_power_up(host);
mmc_select_voltage(host, host->ocr);
BUG_ON(!host->bus_ops->resume);
- host->bus_ops->resume(host);
+ err = host->bus_ops->resume(host);
+ if (err) {
+ printk(KERN_WARNING "%s: error %d during resume "
+ "(card was removed?)\n",
+ mmc_hostname(host), err);
+ if (host->bus_ops->remove)
+ host->bus_ops->remove(host);
+ mmc_claim_host(host);
+ mmc_detach_bus(host);
+ mmc_release_host(host);
+ /* no need to bother upper layers */
+ err = 0;
+ }
}
mmc_bus_put(host);
@@ -1284,7 +1305,7 @@ int mmc_resume_host(struct mmc_host *host)
*/
mmc_detect_change(host, 1);
- return 0;
+ return err;
}
EXPORT_SYMBOL(mmc_resume_host);
diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
index c386348..67ae6ab 100644
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -20,8 +20,8 @@ struct mmc_bus_ops {
int (*sleep)(struct mmc_host *);
void (*remove)(struct mmc_host *);
void (*detect)(struct mmc_host *);
- void (*suspend)(struct mmc_host *);
- void (*resume)(struct mmc_host *);
+ int (*suspend)(struct mmc_host *);
+ int (*resume)(struct mmc_host *);
void (*power_save)(struct mmc_host *);
void (*power_restore)(struct mmc_host *);
};
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index ddddad4..bfefce3 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -530,7 +530,7 @@ static void mmc_detect(struct mmc_host *host)
/*
* Suspend callback from host.
*/
-static void mmc_suspend(struct mmc_host *host)
+static int mmc_suspend(struct mmc_host *host)
{
BUG_ON(!host);
BUG_ON(!host->card);
@@ -540,6 +540,8 @@ static void mmc_suspend(struct mmc_host *host)
mmc_deselect_cards(host);
host->card->state &= ~MMC_STATE_HIGHSPEED;
mmc_release_host(host);
+
+ return 0;
}
/*
@@ -548,7 +550,7 @@ static void mmc_suspend(struct mmc_host *host)
* This function tries to determine if the same card is still present
* and, if so, restore all state to it.
*/
-static void mmc_resume(struct mmc_host *host)
+static int mmc_resume(struct mmc_host *host)
{
int err;
@@ -559,14 +561,7 @@ static void mmc_resume(struct mmc_host *host)
err = mmc_init_card(host, host->ocr, host->card);
mmc_release_host(host);
- if (err) {
- mmc_remove(host);
-
- mmc_claim_host(host);
- mmc_detach_bus(host);
- mmc_release_host(host);
- }
-
+ return err;
}
static void mmc_power_restore(struct mmc_host *host)
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 13b3a6b..10b2a4d 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -564,7 +564,7 @@ static void mmc_sd_detect(struct mmc_host *host)
/*
* Suspend callback from host.
*/
-static void mmc_sd_suspend(struct mmc_host *host)
+static int mmc_sd_suspend(struct mmc_host *host)
{
BUG_ON(!host);
BUG_ON(!host->card);
@@ -574,6 +574,8 @@ static void mmc_sd_suspend(struct mmc_host *host)
mmc_deselect_cards(host);
host->card->state &= ~MMC_STATE_HIGHSPEED;
mmc_release_host(host);
+
+ return 0;
}
/*
@@ -582,7 +584,7 @@ static void mmc_sd_suspend(struct mmc_host *host)
* This function tries to determine if the same card is still present
* and, if so, restore all state to it.
*/
-static void mmc_sd_resume(struct mmc_host *host)
+static int mmc_sd_resume(struct mmc_host *host)
{
int err;
@@ -593,14 +595,7 @@ static void mmc_sd_resume(struct mmc_host *host)
err = mmc_sd_init_card(host, host->ocr, host->card);
mmc_release_host(host);
- if (err) {
- mmc_sd_remove(host);
-
- mmc_claim_host(host);
- mmc_detach_bus(host);
- mmc_release_host(host);
- }
-
+ return err;
}
static void mmc_sd_power_restore(struct mmc_host *host)
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index f4c8637..cdb845b 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -302,6 +302,7 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
goto err;
}
card = oldcard;
+ return 0;
}
/*
@@ -399,62 +400,65 @@ static void mmc_sdio_detect(struct mmc_host *host)
* Therefore all registered functions must have drivers with suspend
* and resume methods. Failing that we simply remove the whole card.
*/
-static void mmc_sdio_suspend(struct mmc_host *host)
+static int mmc_sdio_suspend(struct mmc_host *host)
{
- int i;
+ int i, err = 0;
- /* make sure all registered functions can suspend/resume */
for (i = 0; i < host->card->sdio_funcs; i++) {
struct sdio_func *func = host->card->sdio_func[i];
if (func && sdio_func_present(func) && func->dev.driver) {
const struct dev_pm_ops *pmops = func->dev.driver->pm;
if (!pmops || !pmops->suspend || !pmops->resume) {
- /* just remove the entire card in that case */
- mmc_sdio_remove(host);
- mmc_claim_host(host);
- mmc_detach_bus(host);
- mmc_release_host(host);
- return;
- }
+ /* force removal of entire card in that case */
+ err = -ENOSYS;
+ } else
+ err = pmops->suspend(&func->dev);
+ if (err)
+ break;
}
}
-
- /* now suspend them */
- for (i = 0; i < host->card->sdio_funcs; i++) {
+ while (err && --i >= 0) {
struct sdio_func *func = host->card->sdio_func[i];
if (func && sdio_func_present(func) && func->dev.driver) {
const struct dev_pm_ops *pmops = func->dev.driver->pm;
- pmops->suspend(&func->dev);
+ pmops->resume(&func->dev);
}
}
+
+ return err;
}
-static void mmc_sdio_resume(struct mmc_host *host)
+static int mmc_sdio_resume(struct mmc_host *host)
{
int i, err;
BUG_ON(!host);
BUG_ON(!host->card);
+ /* Basic card reinitialization. */
mmc_claim_host(host);
err = mmc_sdio_init_card(host, host->ocr, host->card);
mmc_release_host(host);
- if (err) {
- mmc_sdio_remove(host);
- mmc_claim_host(host);
- mmc_detach_bus(host);
- mmc_release_host(host);
- return;
- }
- /* resume all functions */
- for (i = 0; i < host->card->sdio_funcs; i++) {
+ /*
+ * If the card looked to be the same as before suspending, then
+ * we proceed to resume all card functions. If one of them returns
+ * an error then we simply return that error to the core and the
+ * card will be redetected as new. It is the responsibility of
+ * the function driver to perform further tests with the extra
+ * knowledge it has of the card to confirm the card is indeed the
+ * same as before suspending (same MAC address for network cards,
+ * etc.) and return an error otherwise.
+ */
+ for (i = 0; !err && i < host->card->sdio_funcs; i++) {
struct sdio_func *func = host->card->sdio_func[i];
if (func && sdio_func_present(func) && func->dev.driver) {
const struct dev_pm_ops *pmops = func->dev.driver->pm;
- pmops->resume(&func->dev);
+ err = pmops->resume(&func->dev);
}
}
+
+ return err;
}
static const struct mmc_bus_ops mmc_sdio_ops = {
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