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authorKanigeri, Hari <h-kanigeri2@ti.com>2010-11-29 20:24:14 +0000
committerHari Kanigeri <h-kanigeri2@ti.com>2010-12-02 05:43:16 -0600
commit582563074a691eb45cb22d2eca70eed8f2091c5f (patch)
treea10cfb02f1dd2c35f773d7892e6a8f75c3c7544c /arch/arm/plat-omap/include/plat/mailbox.h
parenta42743c26a53a2a5f2b2018a9659ab3fb604d5bc (diff)
OMAP: mailbox: add notification support for multiple readers
In the current mailbox driver, the mailbox internal pointer for callback can be directly manipulated by the Users, so a second User can easily corrupt the first user's callback pointer. The initial effort to correct this issue can be referred here: https://patchwork.kernel.org/patch/107520/ Along with fixing the above stated issue, this patch adds the flexibility option to register notifications from multiple readers to the events received on a mailbox instance. The discussion regarding this can be referred here. http://www.mail-archive.com/linux-omap@vger.kernel.org/msg30671.html Signed-off-by: Hari Kanigeri <h-kanigeri2@ti.com> Signed-off-by: Fernando Guzman Lugo <x0095840@ti.com> Acked-by: Hiroshi Doyu <hiroshi.doyu@nokia.com>
Diffstat (limited to 'arch/arm/plat-omap/include/plat/mailbox.h')
-rw-r--r--arch/arm/plat-omap/include/plat/mailbox.h7
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/arm/plat-omap/include/plat/mailbox.h b/arch/arm/plat-omap/include/plat/mailbox.h
index 13f2ef3ea0f..cc3921e9059 100644
--- a/arch/arm/plat-omap/include/plat/mailbox.h
+++ b/arch/arm/plat-omap/include/plat/mailbox.h
@@ -46,7 +46,6 @@ struct omap_mbox_queue {
struct kfifo fifo;
struct work_struct work;
struct tasklet_struct tasklet;
- int (*callback)(void *);
struct omap_mbox *mbox;
bool full;
};
@@ -58,13 +57,15 @@ struct omap_mbox {
struct omap_mbox_ops *ops;
struct device *dev;
void *priv;
+ int use_count;
+ struct blocking_notifier_head notifier;
};
int omap_mbox_msg_send(struct omap_mbox *, mbox_msg_t msg);
void omap_mbox_init_seq(struct omap_mbox *);
-struct omap_mbox *omap_mbox_get(const char *);
-void omap_mbox_put(struct omap_mbox *);
+struct omap_mbox *omap_mbox_get(const char *, struct notifier_block *nb);
+void omap_mbox_put(struct omap_mbox *mbox, struct notifier_block *nb);
int omap_mbox_register(struct device *parent, struct omap_mbox **);
int omap_mbox_unregister(void);