ipack/devices/ipoctal: remove wait_queue and atomic_t board_write

Don't block the TTY client when sending characters.

Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 3 insertions, 16 deletions

diff --git a/drivers/ipack/devices/ipoctal.c b/drivers/ipack/devices/ipoctal.c
index 8d0a86631908..18f9cf1ffe2b 100644
--- a/drivers/ipack/devices/ipoctal.c
+++ b/drivers/ipack/devices/ipoctal.c
@@ -20,7 +20,6 @@
 #include <linux/serial.h>
 #include <linux/tty_flip.h>
 #include <linux/slab.h>
-#include <linux/atomic.h>
 #include <linux/io.h>
 #include <linux/ipack.h>
 #include "ipoctal.h"
@@ -42,7 +41,6 @@ struct ipoctal_channel {
         union scc2698_channel __iomem   *regs;
         union scc2698_block __iomem     *block_regs;
         unsigned int                    board_id;
-        unsigned char                   *board_write;
         u8                              isr_rx_rdy_mask;
         u8                              isr_tx_rdy_mask;
 };
@@ -51,7 +49,6 @@ struct ipoctal {
         struct ipack_device             *dev;
         unsigned int                    board_id;
         struct ipoctal_channel          channel[NR_CHANNELS];
-        unsigned char                   write;
         struct tty_driver               *tty_drv;
         u8 __iomem                      *mem8_space;
         u8 __iomem                      *int_space;
@@ -181,10 +178,8 @@ static void ipoctal_irq_tx(struct ipoctal_channel *channel)
         channel->nb_bytes--;
 
         if (channel->nb_bytes == 0 &&
-            channel->board_id != IPACK1_DEVICE_ID_SBS_OCTAL_485) {
-                *channel->board_write = 1;
-                wake_up_interruptible(&channel->queue);
-        }
+            channel->board_id != IPACK1_DEVICE_ID_SBS_OCTAL_485)
+                iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
 }
 
 static void ipoctal_irq_channel(struct ipoctal_channel *channel)
@@ -207,8 +202,7 @@ static void ipoctal_irq_channel(struct ipoctal_channel *channel)
                 iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
                 iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
                 iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
-                *channel->board_write = 1;
-                wake_up_interruptible(&channel->queue);
+                iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
         }
 
         /* RX data */
@@ -302,7 +296,6 @@ static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
                 struct ipoctal_channel *channel = &ipoctal->channel[i];
                 channel->regs = chan_regs + i;
                 channel->block_regs = block_regs + (i >> 1);
-                channel->board_write = &ipoctal->write;
                 channel->board_id = ipoctal->board_id;
                 if (i & 1) {
                         channel->isr_tx_rdy_mask = ISR_TxRDY_B;
@@ -385,8 +378,6 @@ static int ipoctal_inst_slot(struct ipoctal *ipoctal, unsigned int bus_nr,
 
                 ipoctal_reset_stats(&channel->stats);
                 channel->nb_bytes = 0;
-                init_waitqueue_head(&channel->queue);
-
                 spin_lock_init(&channel->lock);
                 channel->pointer_read = 0;
                 channel->pointer_write = 0;
@@ -450,10 +441,6 @@ static int ipoctal_write_tty(struct tty_struct *tty,
          * operations
          */
         iowrite8(CR_ENABLE_TX, &channel->regs->w.cr);
-        wait_event_interruptible(channel->queue, *channel->board_write);
-        iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
-
-        *channel->board_write = 0;
         return char_copied;
 }