linux-kernel - [PATCH 12/14] epca: Kill the big kernel lock

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Message-ID: <20100401160648.8882.29963.stgit@localhost.localdomain>
Date:	Thu, 01 Apr 2010 17:06:52 +0100
From:	Alan Cox <alan@...ux.intel.com>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH 12/14] epca: Kill the big kernel lock

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

Signed-off-by: Alan Cox <alan@...ux.intel.com>
---

 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)))

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