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Message-Id: <f8cba16cad68c9b9ee7fecae48a1b91708e8e482.1286756123.git.sameo@linux.intel.com>
Date: Mon, 11 Oct 2010 02:24:59 +0200
From: Samuel Ortiz <samuel@...tiz.org>
To: "David S. Miller" <davem@...emloft.net>
Cc: netdev@...r.kernel.org, Samuel Ortiz <samuel@...tiz.org>
Subject: [PATCH net-next 2/5] irda: Remove BKL instances from irnet
The code intends to lock the irnet_socket, so adding a mutex to it allows
for a complet BKL removal.
Signed-off-by: Samuel Ortiz <samuel@...tiz.org>
---
net/irda/irnet/irnet.h | 2 +
net/irda/irnet/irnet_ppp.c | 61 ++++++++++++++++++++++++++++++-------------
2 files changed, 44 insertions(+), 19 deletions(-)
diff --git a/net/irda/irnet/irnet.h b/net/irda/irnet/irnet.h
index 4300df3..0d82ff5 100644
--- a/net/irda/irnet/irnet.h
+++ b/net/irda/irnet/irnet.h
@@ -458,6 +458,8 @@ typedef struct irnet_socket
int disco_index; /* Last read in the discovery log */
int disco_number; /* Size of the discovery log */
+ struct mutex lock;
+
} irnet_socket;
/*
diff --git a/net/irda/irnet/irnet_ppp.c b/net/irda/irnet/irnet_ppp.c
index 69f1fa6..0993bd4 100644
--- a/net/irda/irnet/irnet_ppp.c
+++ b/net/irda/irnet/irnet_ppp.c
@@ -480,7 +480,6 @@ dev_irnet_open(struct inode * inode,
ap = kzalloc(sizeof(*ap), GFP_KERNEL);
DABORT(ap == NULL, -ENOMEM, FS_ERROR, "Can't allocate struct irnet...\n");
- lock_kernel();
/* initialize the irnet structure */
ap->file = file;
@@ -502,18 +501,20 @@ dev_irnet_open(struct inode * inode,
{
DERROR(FS_ERROR, "Can't setup IrDA link...\n");
kfree(ap);
- unlock_kernel();
+
return err;
}
/* For the control channel */
ap->event_index = irnet_events.index; /* Cancel all past events */
+ mutex_init(&ap->lock);
+
/* Put our stuff where we will be able to find it later */
file->private_data = ap;
DEXIT(FS_TRACE, " - ap=0x%p\n", ap);
- unlock_kernel();
+
return 0;
}
@@ -664,7 +665,9 @@ dev_irnet_ioctl(
{
DEBUG(FS_INFO, "Entering PPP discipline.\n");
/* PPP channel setup (ap->chan in configued in dev_irnet_open())*/
- lock_kernel();
+ if (mutex_lock_interruptible(&ap->lock))
+ return -EINTR;
+
err = ppp_register_channel(&ap->chan);
if(err == 0)
{
@@ -677,14 +680,17 @@ dev_irnet_ioctl(
}
else
DERROR(FS_ERROR, "Can't setup PPP channel...\n");
- unlock_kernel();
+
+ mutex_unlock(&ap->lock);
}
else
{
/* In theory, should be N_TTY */
DEBUG(FS_INFO, "Exiting PPP discipline.\n");
/* Disconnect from the generic PPP layer */
- lock_kernel();
+ if (mutex_lock_interruptible(&ap->lock))
+ return -EINTR;
+
if(ap->ppp_open)
{
ap->ppp_open = 0;
@@ -693,24 +699,31 @@ dev_irnet_ioctl(
else
DERROR(FS_ERROR, "Channel not registered !\n");
err = 0;
- unlock_kernel();
+
+ mutex_unlock(&ap->lock);
}
break;
/* Query PPP channel and unit number */
case PPPIOCGCHAN:
- lock_kernel();
+ if (mutex_lock_interruptible(&ap->lock))
+ return -EINTR;
+
if(ap->ppp_open && !put_user(ppp_channel_index(&ap->chan),
(int __user *)argp))
err = 0;
- unlock_kernel();
+
+ mutex_unlock(&ap->lock);
break;
case PPPIOCGUNIT:
- lock_kernel();
+ if (mutex_lock_interruptible(&ap->lock))
+ return -EINTR;
+
if(ap->ppp_open && !put_user(ppp_unit_number(&ap->chan),
(int __user *)argp))
err = 0;
- unlock_kernel();
+
+ mutex_unlock(&ap->lock);
break;
/* All these ioctls can be passed both directly and from ppp_generic,
@@ -730,9 +743,12 @@ dev_irnet_ioctl(
if(!capable(CAP_NET_ADMIN))
err = -EPERM;
else {
- lock_kernel();
+ if (mutex_lock_interruptible(&ap->lock))
+ return -EINTR;
+
err = ppp_irnet_ioctl(&ap->chan, cmd, arg);
- unlock_kernel();
+
+ mutex_unlock(&ap->lock);
}
break;
@@ -740,7 +756,9 @@ dev_irnet_ioctl(
/* Get termios */
case TCGETS:
DEBUG(FS_INFO, "Get termios.\n");
- lock_kernel();
+ if (mutex_lock_interruptible(&ap->lock))
+ return -EINTR;
+
#ifndef TCGETS2
if(!kernel_termios_to_user_termios((struct termios __user *)argp, &ap->termios))
err = 0;
@@ -748,12 +766,15 @@ dev_irnet_ioctl(
if(kernel_termios_to_user_termios_1((struct termios __user *)argp, &ap->termios))
err = 0;
#endif
- unlock_kernel();
+
+ mutex_unlock(&ap->lock);
break;
/* Set termios */
case TCSETSF:
DEBUG(FS_INFO, "Set termios.\n");
- lock_kernel();
+ if (mutex_lock_interruptible(&ap->lock))
+ return -EINTR;
+
#ifndef TCGETS2
if(!user_termios_to_kernel_termios(&ap->termios, (struct termios __user *)argp))
err = 0;
@@ -761,7 +782,8 @@ dev_irnet_ioctl(
if(!user_termios_to_kernel_termios_1(&ap->termios, (struct termios __user *)argp))
err = 0;
#endif
- unlock_kernel();
+
+ mutex_unlock(&ap->lock);
break;
/* Set DTR/RTS */
@@ -784,9 +806,10 @@ dev_irnet_ioctl(
* We should also worry that we don't accept junk here and that
* we get rid of our own buffers */
#ifdef FLUSH_TO_PPP
- lock_kernel();
+ if (mutex_lock_interruptible(&ap->lock))
+ return -EINTR;
ppp_output_wakeup(&ap->chan);
- unlock_kernel();
+ mutex_unlock(&ap->lock);
#endif /* FLUSH_TO_PPP */
err = 0;
break;
--
1.7.1
--
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