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authorTejun Heo <tj@kernel.org>2009-04-23 11:05:20 +0900
committerJens Axboe <jens.axboe@oracle.com>2009-04-28 07:37:36 +0200
commitec24751a6b57e1373a12361e581b2458bc9bb791 (patch)
tree098ce79b89e10437d7660f3d65935a48f31a611c /arch/arm/plat-omap
parentf06d9a2b52e246a66b606130cea3f0d7b7be17a7 (diff)
arm-omap: don't abuse rq->data
omap mailbox uses rq->data as the second opaque pointer to carry mbox_msg_t and rq->special message argument which is needed only for tx. Add and use omap_msg_tx_data struct for tx and use rq->special for mbox_msg_t for rx such that only rq->special is used as opaque pointer. [ Impact: cleanup rq->data usage, extra kmalloc in msg_send ] Signed-off-by: Tejun Heo <tj@kernel.org> Cc: Russell King <rmk@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/plat-omap')
-rw-r--r--arch/arm/plat-omap/mailbox.c43
1 files changed, 31 insertions, 12 deletions
diff --git a/arch/arm/plat-omap/mailbox.c b/arch/arm/plat-omap/mailbox.c
index cf81bad8aec..538ba7541d3 100644
--- a/arch/arm/plat-omap/mailbox.c
+++ b/arch/arm/plat-omap/mailbox.c
@@ -147,24 +147,40 @@ static int __mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg, void *arg)
return ret;
}
+struct omap_msg_tx_data {
+ mbox_msg_t msg;
+ void *arg;
+};
+
+static void omap_msg_tx_end_io(struct request *rq, int error)
+{
+ kfree(rq->special);
+ __blk_put_request(rq->q, rq);
+}
+
int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg, void* arg)
{
+ struct omap_msg_tx_data *tx_data;
struct request *rq;
struct request_queue *q = mbox->txq->queue;
- int ret = 0;
+
+ tx_data = kmalloc(sizeof(*tx_data), GFP_ATOMIC);
+ if (unlikely(!tx_data))
+ return -ENOMEM;
rq = blk_get_request(q, WRITE, GFP_ATOMIC);
if (unlikely(!rq)) {
- ret = -ENOMEM;
- goto fail;
+ kfree(tx_data);
+ return -ENOMEM;
}
- rq->data = (void *)msg;
- blk_insert_request(q, rq, 0, arg);
+ tx_data->msg = msg;
+ tx_data->arg = arg;
+ rq->end_io = omap_msg_tx_end_io;
+ blk_insert_request(q, rq, 0, tx_data);
schedule_work(&mbox->txq->work);
- fail:
- return ret;
+ return 0;
}
EXPORT_SYMBOL(omap_mbox_msg_send);
@@ -178,6 +194,8 @@ static void mbox_tx_work(struct work_struct *work)
struct request_queue *q = mbox->txq->queue;
while (1) {
+ struct omap_msg_tx_data *tx_data;
+
spin_lock(q->queue_lock);
rq = elv_next_request(q);
spin_unlock(q->queue_lock);
@@ -185,7 +203,9 @@ static void mbox_tx_work(struct work_struct *work)
if (!rq)
break;
- ret = __mbox_msg_send(mbox, (mbox_msg_t) rq->data, rq->special);
+ tx_data = rq->special;
+
+ ret = __mbox_msg_send(mbox, tx_data->msg, tx_data->arg);
if (ret) {
enable_mbox_irq(mbox, IRQ_TX);
return;
@@ -222,7 +242,7 @@ static void mbox_rx_work(struct work_struct *work)
if (!rq)
break;
- msg = (mbox_msg_t) rq->data;
+ msg = (mbox_msg_t)rq->special;
blk_end_request_all(rq, 0);
mbox->rxq->callback((void *)msg);
}
@@ -260,7 +280,6 @@ static void __mbox_rx_interrupt(struct omap_mbox *mbox)
goto nomem;
msg = mbox_fifo_read(mbox);
- rq->data = (void *)msg;
if (unlikely(mbox_seq_test(mbox, msg))) {
pr_info("mbox: Illegal seq bit!(%08x)\n", msg);
@@ -268,7 +287,7 @@ static void __mbox_rx_interrupt(struct omap_mbox *mbox)
mbox->err_notify();
}
- blk_insert_request(q, rq, 0, NULL);
+ blk_insert_request(q, rq, 0, (void *)msg);
if (mbox->ops->type == OMAP_MBOX_TYPE1)
break;
}
@@ -331,7 +350,7 @@ omap_mbox_read(struct device *dev, struct device_attribute *attr, char *buf)
if (!rq)
break;
- *p = (mbox_msg_t) rq->data;
+ *p = (mbox_msg_t)rq->special;
blk_end_request_all(rq, 0);