From patchwork Mon Oct 11 00:24:59 2010 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Samuel Ortiz X-Patchwork-Id: 67371 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 264B9B70A3 for ; Mon, 11 Oct 2010 11:25:52 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752573Ab0JKAZr (ORCPT ); Sun, 10 Oct 2010 20:25:47 -0400 Received: from mga02.intel.com ([134.134.136.20]:23906 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750842Ab0JKAZq (ORCPT ); Sun, 10 Oct 2010 20:25:46 -0400 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga101.jf.intel.com with ESMTP; 10 Oct 2010 17:25:45 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.57,311,1283756400"; d="scan'208";a="562583455" Received: from unknown (HELO sortiz-mobl) ([10.255.18.201]) by orsmga002.jf.intel.com with ESMTP; 10 Oct 2010 17:25:44 -0700 From: Samuel Ortiz To: "David S. Miller" Cc: netdev@vger.kernel.org, Samuel Ortiz Subject: [PATCH net-next 2/5] irda: Remove BKL instances from irnet Date: Mon, 11 Oct 2010 02:24:59 +0200 Message-Id: X-Mailer: git-send-email 1.7.1 In-Reply-To: References: In-Reply-To: References: Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org 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 --- 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;