[RFC PATCH 08/11] mmc: core: Add MMC abort interface

From: Venkatraman S
Date: Wed Apr 18 2012 - 02:27:35 EST

HPI (and possibly other) procedures require that an ongoing
mmc request issued to a controller be aborted in the middle
of a transaction. Define a abort interface function to the
controller so that individual host controllers can safely
abort a request, stop the dma and cleanup their statemachine
etc. The implementation is controller dependant

Signed-off-by: Venkatraman S <svenkatr@xxxxxx>
drivers/mmc/core/core.c | 8 ++++++++
include/linux/mmc/host.h | 1 +
2 files changed, 9 insertions(+)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 6cefa01..1963305 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -328,6 +328,14 @@ static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,

+static int mmc_abort_req(struct mmc_host *host, struct mmc_request *req)
+ if (host->ops->abort_req)
+ return host->ops->abort_req(host, req);
+ return -ENOSYS;
* mmc_start_req - start a non-blocking request
* @host: MMC host to start command
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index cbde4b7..826e34d 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -98,6 +98,7 @@ struct mmc_host_ops {
int err);
void (*pre_req)(struct mmc_host *host, struct mmc_request *req,
bool is_first_req);
+ int (*abort_req)(struct mmc_host *host, struct mmc_request *req);
void (*request)(struct mmc_host *host, struct mmc_request *req);
* Avoid calling these three functions too often or in a "fast path",

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