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    Subject[PATCH 20/68] epca: Kill the big kernel lock
    Date
    From: Alan Cox <alan@linux.intel.com>

    The lock is no longer needed for wait until sent paths so this can go

    Signed-off-by: Alan Cox <alan@linux.intel.com>
    Cc: Arnd Bergmann <arnd@arndb.de>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    ---
    drivers/char/epca.c | 4 +---
    1 files changed, 1 insertions(+), 3 deletions(-)

    diff --git a/drivers/char/epca.c b/drivers/char/epca.c
    index 6f5ffe1..d9df46a 100644
    --- a/drivers/char/epca.c
    +++ b/drivers/char/epca.c
    @@ -36,7 +36,7 @@
    #include <linux/ctype.h>
    #include <linux/tty.h>
    #include <linux/tty_flip.h>
    -#include <linux/smp_lock.h>
    +#include <linux/slab.h>
    #include <linux/ioport.h>
    #include <linux/interrupt.h>
    #include <linux/uaccess.h>
    @@ -2105,7 +2105,6 @@ static int pc_ioctl(struct tty_struct *tty, struct file *file,
    break;
    case DIGI_SETAW:
    case DIGI_SETAF:
    - lock_kernel();
    if (cmd == DIGI_SETAW) {
    /* Setup an event to indicate when the transmit
    buffer empties */
    @@ -2118,7 +2117,6 @@ static int pc_ioctl(struct tty_struct *tty, struct file *file,
    if (tty->ldisc->ops->flush_buffer)
    tty->ldisc->ops->flush_buffer(tty);
    }
    - unlock_kernel();
    /* Fall Thru */
    case DIGI_SETA:
    if (copy_from_user(&ch->digiext, argp, sizeof(digi_t)))
    --
    1.7.2


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