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soc: qcom: smd: Introduce callback setter 

Introduce a setter for the callback function pointer to clarify the
locking around the operation and to reduce some duplication.

Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>
This commit is contained in:
Bjorn Andersson 2016-02-17 22:39:02 -08:00 committed by Andy Gross
parent 3b904b046c
commit 39f0db298e
2 changed files with 20 additions and 9 deletions
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25
drivers/soc/qcom/smd.c
View File

@ -186,7 +186,7 @@ struct qcom_smd_channel {
int fifo_size;
void *bounce_buffer;
int (*cb)(struct qcom_smd_device *, const void *, size_t);
qcom_smd_cb_t cb;
spinlock_t recv_lock;
@ -377,6 +377,19 @@ static void qcom_smd_channel_reset(struct qcom_smd_channel *channel)
channel->pkt_size = 0;
}
/*
* Set the callback for a channel, with appropriate locking
*/
static void qcom_smd_channel_set_callback(struct qcom_smd_channel *channel,
qcom_smd_cb_t cb)
{
unsigned long flags;
spin_lock_irqsave(&channel->recv_lock, flags);
channel->cb = cb;
spin_unlock_irqrestore(&channel->recv_lock, flags);
};
/*
* Calculate the amount of data available in the rx fifo
*/
@ -814,8 +827,7 @@ static int qcom_smd_dev_probe(struct device *dev)
if (!channel->bounce_buffer)
return -ENOMEM;
channel->cb = qsdrv->callback;
qcom_smd_channel_set_callback(channel, qsdrv->callback);
qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENING);
qcom_smd_channel_set_state(channel, SMD_CHANNEL_OPENED);
@ -831,7 +843,7 @@ static int qcom_smd_dev_probe(struct device *dev)
err:
dev_err(&qsdev->dev, "probe failed\n");
channel->cb = NULL;
qcom_smd_channel_set_callback(channel, NULL);
kfree(channel->bounce_buffer);
channel->bounce_buffer = NULL;
@ -850,16 +862,13 @@ static int qcom_smd_dev_remove(struct device *dev)
struct qcom_smd_device *qsdev = to_smd_device(dev);
struct qcom_smd_driver *qsdrv = to_smd_driver(dev);
struct qcom_smd_channel *channel = qsdev->channel;
unsigned long flags;
qcom_smd_channel_set_state(channel, SMD_CHANNEL_CLOSING);
/*
* Make sure we don't race with the code receiving data.
*/
spin_lock_irqsave(&channel->recv_lock, flags);
channel->cb = NULL;
spin_unlock_irqrestore(&channel->recv_lock, flags);
qcom_smd_channel_set_callback(channel, NULL);
/* Wake up any sleepers in qcom_smd_send() */
wake_up_interruptible(&channel->fblockread_event);

4
include/linux/soc/qcom/smd.h
View File

@ -26,6 +26,8 @@ struct qcom_smd_device {
struct qcom_smd_channel *channel;
};
typedef int (*qcom_smd_cb_t)(struct qcom_smd_device *, const void *, size_t);
/**
* struct qcom_smd_driver - smd driver struct
* @driver: underlying device driver
@ -42,7 +44,7 @@ struct qcom_smd_driver {
int (*probe)(struct qcom_smd_device *dev);
void (*remove)(struct qcom_smd_device *dev);
int (*callback)(struct qcom_smd_device *, const void *, size_t);
qcom_smd_cb_t callback;
};
int qcom_smd_driver_register(struct qcom_smd_driver *drv);