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[media] lirc_zilog: Remove unneeded rx->buf_lock

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Remove the rx->buf_lock that protected the rx->buf lirc_buffer.  The
underlying operations on the objects within the lirc_buffer are already
protected by spinlocks, or the objects are constant (e.g. chunk_size).

Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Andy Walls 2011-01-27 02:34:13 -03:00 committed by Mauro Carvalho Chehab
parent 915e54733d
commit 8152b760ef
1 changed files with 9 additions and 14 deletions
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23
drivers/staging/lirc/lirc_zilog.c
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@ -67,9 +67,8 @@ struct IR_rx {
/* RX device */ /* RX device */
struct i2c_client *c; struct i2c_client *c;
/* RX device buffer & lock */ /* RX device buffer */
struct lirc_buffer buf; struct lirc_buffer buf;
struct mutex buf_lock;
/* RX polling thread data */ /* RX polling thread data */
struct task_struct *task; struct task_struct *task;
@ -718,18 +717,15 @@ static ssize_t read(struct file *filep, char *outbuf, size_t n, loff_t *ppos)
struct IR *ir = filep->private_data; struct IR *ir = filep->private_data;
struct IR_rx *rx = ir->rx; struct IR_rx *rx = ir->rx;
int ret = 0, written = 0; int ret = 0, written = 0;
unsigned int m;
DECLARE_WAITQUEUE(wait, current); DECLARE_WAITQUEUE(wait, current);
dprintk("read called\n"); dprintk("read called\n");
if (rx == NULL) if (rx == NULL)
return -ENODEV; return -ENODEV;
if (mutex_lock_interruptible(&rx->buf_lock))
return -ERESTARTSYS;
if (n % rx->buf.chunk_size) { if (n % rx->buf.chunk_size) {
dprintk("read result = -EINVAL\n"); dprintk("read result = -EINVAL\n");
mutex_unlock(&rx->buf_lock);
return -EINVAL; return -EINVAL;
} }
@ -767,19 +763,19 @@ static ssize_t read(struct file *filep, char *outbuf, size_t n, loff_t *ppos)
set_current_state(TASK_INTERRUPTIBLE); set_current_state(TASK_INTERRUPTIBLE);
} else { } else {
unsigned char buf[rx->buf.chunk_size]; unsigned char buf[rx->buf.chunk_size];
lirc_buffer_read(&rx->buf, buf); m = lirc_buffer_read(&rx->buf, buf);
ret = copy_to_user((void *)outbuf+written, buf, if (m == rx->buf.chunk_size) {
rx->buf.chunk_size); ret = copy_to_user((void *)outbuf+written, buf,
written += rx->buf.chunk_size; rx->buf.chunk_size);
written += rx->buf.chunk_size;
}
} }
} }
remove_wait_queue(&rx->buf.wait_poll, &wait); remove_wait_queue(&rx->buf.wait_poll, &wait);
set_current_state(TASK_RUNNING); set_current_state(TASK_RUNNING);
mutex_unlock(&rx->buf_lock);
dprintk("read result = %s (%d)\n", dprintk("read result = %d (%s)\n", ret, ret ? "Error" : "OK");
ret ? "-EFAULT" : "OK", ret);
return ret ? ret : written; return ret ? ret : written;
} }
@ -1327,7 +1323,6 @@ static int ir_probe(struct i2c_client *client, const struct i2c_device_id *id)
if (ret) if (ret)
goto out_free_xx; goto out_free_xx;
mutex_init(&ir->rx->buf_lock);
ir->rx->c = client; ir->rx->c = client;
ir->rx->hdpvr_data_fmt = ir->rx->hdpvr_data_fmt =
(id->driver_data & ID_FLAG_HDPVR) ? true : false; (id->driver_data & ID_FLAG_HDPVR) ? true : false;