From mboxrd@z Thu Jan 1 00:00:00 1970 From: h-kanigeri2@ti.com (Hari Kanigeri) Date: Thu, 18 Nov 2010 13:15:41 -0600 Subject: [PATCH v3 4/5] OMAP: mailbox: send message in process context In-Reply-To: <1290107742-16760-1-git-send-email-h-kanigeri2@ti.com> References: <1290107742-16760-1-git-send-email-h-kanigeri2@ti.com> Message-ID: <1290107742-16760-5-git-send-email-h-kanigeri2@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Schedule the Tasklet to send only when mailbox fifo is full and there are pending messages in kifo, else send the message directly in the Process context. This would avoid needless scheduling of Tasklet for every message transfer Signed-off-by: Hari Kanigeri --- arch/arm/plat-omap/mailbox.c | 9 +++++++-- 1 files changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/arm/plat-omap/mailbox.c b/arch/arm/plat-omap/mailbox.c index abfc495..b14bc34 100644 --- a/arch/arm/plat-omap/mailbox.c +++ b/arch/arm/plat-omap/mailbox.c @@ -92,20 +92,25 @@ int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg) struct omap_mbox_queue *mq = mbox->txq; int ret = 0, len; - spin_lock(&mq->lock); + spin_lock_bh(&mq->lock); if (kfifo_avail(&mq->fifo) < sizeof(msg)) { ret = -ENOMEM; goto out; } + if (kfifo_is_empty(&mq->fifo) && !__mbox_poll_for_space(mbox)) { + mbox_fifo_write(mbox, msg); + goto out; + } + len = kfifo_in(&mq->fifo, (unsigned char *)&msg, sizeof(msg)); WARN_ON(len != sizeof(msg)); tasklet_schedule(&mbox->txq->tasklet); out: - spin_unlock(&mq->lock); + spin_unlock_bh(&mq->lock); return ret; } EXPORT_SYMBOL(omap_mbox_msg_send); -- 1.7.0