From: Johan Hovold <jhovold@xxxxxxxxx>
Kill custom fifo implementation.
Compile-only tested.
Signed-off-by: Johan Hovold <jhovold@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
drivers/usb/serial/ti_usb_3410_5052.c | 179 +++------------------------------
1 files changed, 14 insertions(+), 165 deletions(-)
diff --git a/drivers/usb/serial/ti_usb_3410_5052.c b/drivers/usb/serial/ti_usb_3410_5052.c
index e1bfda3..90979a1 100644
--- a/drivers/usb/serial/ti_usb_3410_5052.c
+++ b/drivers/usb/serial/ti_usb_3410_5052.c
@@ -30,7 +30,7 @@
#include <linux/spinlock.h>
#include <linux/ioctl.h>
#include <linux/serial.h>
-#include <linux/circ_buf.h>
+#include <linux/kfifo.h>
#include <linux/mutex.h>
#include <linux/uaccess.h>
#include <linux/usb.h>
@@ -40,7 +40,7 @@
/* Defines */
-#define TI_DRIVER_VERSION "v0.9"
+#define TI_DRIVER_VERSION "v0.10"
#define TI_DRIVER_AUTHOR "Al Borchers <alborchers@xxxxxxxxxxxxxxxx>"
#define TI_DRIVER_DESC "TI USB 3410/5052 Serial Driver"
@@ -82,7 +82,7 @@ struct ti_port {
spinlock_t tp_lock;
int tp_read_urb_state;
int tp_write_urb_in_use;
- struct circ_buf *tp_write_buf;
+ struct kfifo write_fifo;
};
struct ti_device {
@@ -144,15 +144,6 @@ static int ti_write_byte(struct ti_device *tdev, unsigned long addr,
static int ti_download_firmware(struct ti_device *tdev);
-/* circular buffer */
-static struct circ_buf *ti_buf_alloc(void);
-static void ti_buf_free(struct circ_buf *cb);
-static void ti_buf_clear(struct circ_buf *cb);
-static int ti_buf_data_avail(struct circ_buf *cb);
-static int ti_buf_space_avail(struct circ_buf *cb);
-static int ti_buf_put(struct circ_buf *cb, const char *buf, int count);
-static int ti_buf_get(struct circ_buf *cb, char *buf, int count);
-
/* Data */
@@ -450,8 +441,8 @@ static int ti_startup(struct usb_serial *serial)
tport->tp_closing_wait = closing_wait;
init_waitqueue_head(&tport->tp_msr_wait);
init_waitqueue_head(&tport->tp_write_wait);
- tport->tp_write_buf = ti_buf_alloc();
- if (tport->tp_write_buf == NULL) {
+ if (kfifo_alloc(&tport->write_fifo, TI_WRITE_BUF_SIZE,
+ GFP_KERNEL)) {
dev_err(&dev->dev, "%s - out of memory\n", __func__);
kfree(tport);
status = -ENOMEM;
@@ -468,7 +459,7 @@ static int ti_startup(struct usb_serial *serial)
free_tports:
for (--i; i >= 0; --i) {
tport = usb_get_serial_port_data(serial->port[i]);
- ti_buf_free(tport->tp_write_buf);
+ kfifo_free(&tport->write_fifo);
kfree(tport);
usb_set_serial_port_data(serial->port[i], NULL);
}
@@ -490,7 +481,7 @@ static void ti_release(struct usb_serial *serial)
for (i = 0; i < serial->num_ports; ++i) {
tport = usb_get_serial_port_data(serial->port[i]);
if (tport) {
- ti_buf_free(tport->tp_write_buf);
+ kfifo_free(&tport->write_fifo);
kfree(tport);
}
}
@@ -701,7 +692,6 @@ static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
const unsigned char *data, int count)
{
struct ti_port *tport = usb_get_serial_port_data(port);
- unsigned long flags;
dbg("%s - port %d", __func__, port->number);
@@ -713,10 +703,8 @@ static int ti_write(struct tty_struct *tty, struct usb_serial_port *port,
if (tport == NULL || !tport->tp_is_open)
return -ENODEV;
- spin_lock_irqsave(&tport->tp_lock, flags);
- count = ti_buf_put(tport->tp_write_buf, data, count);
- spin_unlock_irqrestore(&tport->tp_lock, flags);
-
+ count = kfifo_in_locked(&tport->write_fifo, data, count,
+ &tport->tp_lock);
ti_send(tport);
return count;
@@ -736,7 +724,7 @@ static int ti_write_room(struct tty_struct *tty)
return 0;
spin_lock_irqsave(&tport->tp_lock, flags);
- room = ti_buf_space_avail(tport->tp_write_buf);
+ room = kfifo_avail(&tport->write_fifo);
spin_unlock_irqrestore(&tport->tp_lock, flags);
dbg("%s - returns %d", __func__, room);
@@ -757,7 +745,7 @@ static int ti_chars_in_buffer(struct tty_struct *tty)
return 0;
spin_lock_irqsave(&tport->tp_lock, flags);
- chars = ti_buf_data_avail(tport->tp_write_buf);
+ chars = kfifo_len(&tport->write_fifo);
spin_unlock_irqrestore(&tport->tp_lock, flags);
dbg("%s - returns %d", __func__, chars);
@@ -1309,7 +1297,7 @@ static void ti_send(struct ti_port *tport)
if (tport->tp_write_urb_in_use)
goto unlock;
- count = ti_buf_get(tport->tp_write_buf,
+ count = kfifo_out(&tport->write_fifo,
port->write_urb->transfer_buffer,
port->bulk_out_size);
@@ -1504,7 +1492,7 @@ static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush)
add_wait_queue(&tport->tp_write_wait, &wait);
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
- if (ti_buf_data_avail(tport->tp_write_buf) == 0
+ if (kfifo_len(&tport->write_fifo) == 0
|| timeout == 0 || signal_pending(current)
|| tdev->td_urb_error
|| port->serial->disconnected) /* disconnect */
@@ -1518,7 +1506,7 @@ static void ti_drain(struct ti_port *tport, unsigned long timeout, int flush)
/* flush any remaining data in the buffer */
if (flush)
- ti_buf_clear(tport->tp_write_buf);
+ kfifo_reset_out(&tport->write_fifo);
spin_unlock_irq(&tport->tp_lock);
@@ -1761,142 +1749,3 @@ static int ti_download_firmware(struct ti_device *tdev)
return 0;
}
-
-
-/* Circular Buffer Functions */
-
-/*
- * ti_buf_alloc
- *
- * Allocate a circular buffer and all associated memory.
- */
-
-static struct circ_buf *ti_buf_alloc(void)
-{
- struct circ_buf *cb;
-
- cb = kmalloc(sizeof(struct circ_buf), GFP_KERNEL);
- if (cb == NULL)
- return NULL;
-
- cb->buf = kmalloc(TI_WRITE_BUF_SIZE, GFP_KERNEL);
- if (cb->buf == NULL) {
- kfree(cb);
- return NULL;
- }
-
- ti_buf_clear(cb);
-
- return cb;
-}
-
-
-/*
- * ti_buf_free
- *
- * Free the buffer and all associated memory.
- */
-
-static void ti_buf_free(struct circ_buf *cb)
-{
- kfree(cb->buf);
- kfree(cb);
-}
-
-
-/*
- * ti_buf_clear
- *
- * Clear out all data in the circular buffer.
- */
-
-static void ti_buf_clear(struct circ_buf *cb)
-{
- cb->head = cb->tail = 0;
-}
-
-
-/*
- * ti_buf_data_avail
- *
- * Return the number of bytes of data available in the circular
- * buffer.
- */
-
-static int ti_buf_data_avail(struct circ_buf *cb)
-{
- return CIRC_CNT(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
-}
-
-
-/*
- * ti_buf_space_avail
- *
- * Return the number of bytes of space available in the circular
- * buffer.
- */
-
-static int ti_buf_space_avail(struct circ_buf *cb)
-{
- return CIRC_SPACE(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
-}
-
-
-/*
- * ti_buf_put
- *
- * Copy data data from a user buffer and put it into the circular buffer.
- * Restrict to the amount of space available.
- *
- * Return the number of bytes copied.
- */
-
-static int ti_buf_put(struct circ_buf *cb, const char *buf, int count)
-{
- int c, ret = 0;
-
- while (1) {
- c = CIRC_SPACE_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
- if (count < c)
- c = count;
- if (c <= 0)
- break;
- memcpy(cb->buf + cb->head, buf, c);
- cb->head = (cb->head + c) & (TI_WRITE_BUF_SIZE-1);
- buf += c;
- count -= c;
- ret += c;
- }
-
- return ret;
-}
-
-
-/*
- * ti_buf_get
- *
- * Get data from the circular buffer and copy to the given buffer.
- * Restrict to the amount of data available.
- *
- * Return the number of bytes copied.
- */
-
-static int ti_buf_get(struct circ_buf *cb, char *buf, int count)
-{
- int c, ret = 0;
-
- while (1) {
- c = CIRC_CNT_TO_END(cb->head, cb->tail, TI_WRITE_BUF_SIZE);
- if (count < c)
- c = count;
- if (c <= 0)
- break;
- memcpy(buf, cb->buf + cb->tail, c);
- cb->tail = (cb->tail + c) & (TI_WRITE_BUF_SIZE-1);
- buf += c;
- count -= c;
- ret += c;
- }
-
- return ret;
-}
--
1.7.1
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
