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ipack/devices/ipoctal: remove wait_queue and atomic_t board_write

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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>
This commit is contained in:
Samuel Iglesias Gonsalvez 2012-12-10 11:50:00 +01:00 • committed by Greg Kroah-Hartman
parent 7e5730d7c2
commit a1da13a67a
1 changed files with 3 additions and 16 deletions
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19
drivers/ipack/devices/ipoctal.c
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@ -20,7 +20,6 @@
#include <linux/serial.h> #include <linux/serial.h>
#include <linux/tty_flip.h> #include <linux/tty_flip.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/atomic.h>
#include <linux/io.h> #include <linux/io.h>
#include <linux/ipack.h> #include <linux/ipack.h>
#include "ipoctal.h" #include "ipoctal.h"
@ -42,7 +41,6 @@ struct ipoctal_channel {
union scc2698_channel __iomem *regs; union scc2698_channel __iomem *regs;
union scc2698_block __iomem *block_regs; union scc2698_block __iomem *block_regs;
unsigned int board_id; unsigned int board_id;
unsigned char *board_write;
u8 isr_rx_rdy_mask; u8 isr_rx_rdy_mask;
u8 isr_tx_rdy_mask; u8 isr_tx_rdy_mask;
}; };
@ -51,7 +49,6 @@ struct ipoctal {
struct ipack_device *dev; struct ipack_device *dev;
unsigned int board_id; unsigned int board_id;
struct ipoctal_channel channel[NR_CHANNELS]; struct ipoctal_channel channel[NR_CHANNELS];
unsigned char write;
struct tty_driver *tty_drv; struct tty_driver *tty_drv;
u8 __iomem *mem8_space; u8 __iomem *mem8_space;
u8 __iomem *int_space; u8 __iomem *int_space;
@ -181,10 +178,8 @@ static void ipoctal_irq_tx(struct ipoctal_channel *channel)
channel->nb_bytes--; channel->nb_bytes--;
if (channel->nb_bytes == 0 && if (channel->nb_bytes == 0 &&
channel->board_id != IPACK1_DEVICE_ID_SBS_OCTAL_485) { channel->board_id != IPACK1_DEVICE_ID_SBS_OCTAL_485)
*channel->board_write = 1; iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
wake_up_interruptible(&channel->queue);
}
} }
static void ipoctal_irq_channel(struct ipoctal_channel *channel) 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_DISABLE_TX, &channel->regs->w.cr);
iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr); iowrite8(CR_CMD_NEGATE_RTSN, &channel->regs->w.cr);
iowrite8(CR_ENABLE_RX, &channel->regs->w.cr); iowrite8(CR_ENABLE_RX, &channel->regs->w.cr);
*channel->board_write = 1; iowrite8(CR_DISABLE_TX, &channel->regs->w.cr);
wake_up_interruptible(&channel->queue);
} }
/* RX data */ /* 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]; struct ipoctal_channel *channel = &ipoctal->channel[i];
channel->regs = chan_regs + i; channel->regs = chan_regs + i;
channel->block_regs = block_regs + (i >> 1); channel->block_regs = block_regs + (i >> 1);
channel->board_write = &ipoctal->write;
channel->board_id = ipoctal->board_id; channel->board_id = ipoctal->board_id;
if (i & 1) { if (i & 1) {
channel->isr_tx_rdy_mask = ISR_TxRDY_B; 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); ipoctal_reset_stats(&channel->stats);
channel->nb_bytes = 0; channel->nb_bytes = 0;
init_waitqueue_head(&channel->queue);
spin_lock_init(&channel->lock); spin_lock_init(&channel->lock);
channel->pointer_read = 0; channel->pointer_read = 0;
channel->pointer_write = 0; channel->pointer_write = 0;
@ -450,10 +441,6 @@ static int ipoctal_write_tty(struct tty_struct *tty,
* operations * operations
*/ */
iowrite8(CR_ENABLE_TX, &channel->regs->w.cr); 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; return char_copied;
} }