[PATCH] mmc: add module parameter to set whether cards are assumed removable

Ben Hutchings
2009-11-11T04:44:34Z

Some people run general-purpose distribution kernels on netbooks with
a card that is physically non-removable or logically non-removable
(e.g. used for /home) and cannot be cleanly unmounted during suspend.
Add a module parameter to set whether cards are assumed removable or
non-removable, with the default set by CONFIG_MMC_UNSAFE_RESUME.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/mmc/core/Kconfig | 4 +++-
drivers/mmc/core/core.c | 16 ++++++++++++++++
drivers/mmc/core/core.h | 2 ++
drivers/mmc/core/mmc.c | 23 +----------------------
drivers/mmc/core/sd.c | 21 +--------------------
5 files changed, 23 insertions(+), 43 deletions(-)

diff --git a/drivers/mmc/core/Kconfig b/drivers/mmc/core/Kconfig
index ab37a6d..bb22ffd 100644
--- a/drivers/mmc/core/Kconfig
+++ b/drivers/mmc/core/Kconfig
@@ -3,7 +3,7 @@
#

config MMC_UNSAFE_RESUME
- bool "Allow unsafe resume (DANGEROUS)"
+ bool "Assume MMC/SD cards are non-removable (DANGEROUS)"
help
If you say Y here, the MMC layer will assume that all cards
stayed in their respective slots during the suspend. The
@@ -14,3 +14,5 @@ config MMC_UNSAFE_RESUME
This option is usually just for embedded systems which use
a MMC/SD card for rootfs. Most people should say N here.

+ This option sets a default which can be overridden by the
+ module parameter "removable=0" or "removable=1".
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index d98b0e2..010c964 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -48,6 +48,22 @@ int use_spi_crc = 1;
module_param(use_spi_crc, bool, 0);

/*
+ * We normally treat cards as removed during suspend if they are not
+ * known to be on a non-removable bus, to avoid the risk of writing
+ * back data to a different card after resume. Allow this to be
+ * overridden if necessary.
+ */
+#ifdef CONFIG_MMC_UNSAFE_RESUME
+int mmc_assume_removable;
+#else
+int mmc_assume_removable = 1;
+#endif
+module_param_named(removable, mmc_assume_removable, bool, 0644);
+MODULE_PARM_DESC(
+ removable,
+ "MMC/SD cards are removable and may be removed during suspend");
+
+/*
* Internal function. Schedule delayed work in the MMC work queue.
*/
static int mmc_schedule_delayed_work(struct delayed_work *work,
diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
index 1c68783..d20b7bc 100644
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -64,7 +64,9 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr);
int mmc_attach_sd(struct mmc_host *host, u32 ocr);
int mmc_attach_sdio(struct mmc_host *host, u32 ocr);

+/* Module parameters */
extern int use_spi_crc;
+extern int mmc_assume_removable;

/* Debugfs information for hosts and cards */
void mmc_add_host_debugfs(struct mmc_host *host);
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index bfefce3..c111894 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -602,25 +602,6 @@ static int mmc_awake(struct mmc_host *host)
return err;
}

-#ifdef CONFIG_MMC_UNSAFE_RESUME
-
-static const struct mmc_bus_ops mmc_ops = {
- .awake = mmc_awake,
- .sleep = mmc_sleep,
- .remove = mmc_remove,
- .detect = mmc_detect,
- .suspend = mmc_suspend,
- .resume = mmc_resume,
- .power_restore = mmc_power_restore,
-};
-
-static void mmc_attach_bus_ops(struct mmc_host *host)
-{
- mmc_attach_bus(host, &mmc_ops);
-}
-
-#else
-
static const struct mmc_bus_ops mmc_ops = {
.awake = mmc_awake,
.sleep = mmc_sleep,
@@ -645,15 +626,13 @@ static void mmc_attach_bus_ops(struct mmc_host *host)
{
const struct mmc_bus_ops *bus_ops;

- if (host->caps & MMC_CAP_NONREMOVABLE)
+ if (host->caps & MMC_CAP_NONREMOVABLE || !mmc_assume_removable)
bus_ops = &mmc_ops_unsafe;
else
bus_ops = &mmc_ops;
mmc_attach_bus(host, bus_ops);
}

-#endif
-
/*
* Starting point for MMC card init.
*/
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 10b2a4d..fdd414e 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -606,23 +606,6 @@ static void mmc_sd_power_restore(struct mmc_host *host)
mmc_release_host(host);
}

-#ifdef CONFIG_MMC_UNSAFE_RESUME
-
-static const struct mmc_bus_ops mmc_sd_ops = {
- .remove = mmc_sd_remove,
- .detect = mmc_sd_detect,
- .suspend = mmc_sd_suspend,
- .resume = mmc_sd_resume,
- .power_restore = mmc_sd_power_restore,
-};
-
-static void mmc_sd_attach_bus_ops(struct mmc_host *host)
-{
- mmc_attach_bus(host, &mmc_sd_ops);
-}
-
-#else
-
static const struct mmc_bus_ops mmc_sd_ops = {
.remove = mmc_sd_remove,
.detect = mmc_sd_detect,
@@ -643,15 +626,13 @@ static void mmc_sd_attach_bus_ops(struct mmc_host *host)
{
const struct mmc_bus_ops *bus_ops;

- if (host->caps & MMC_CAP_NONREMOVABLE)
+ if (host->caps & MMC_CAP_NONREMOVABLE || !mmc_assume_removable)
bus_ops = &mmc_sd_ops_unsafe;
else
bus_ops = &mmc_sd_ops;
mmc_attach_bus(host, bus_ops);
}

-#endif
-
/*
* Starting point for SD card init.
*/
--
1.6.5.2