linux-kernel - [tip:bkl/drivers] agp: Remove the BKL from agp

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Date:	Wed, 14 Oct 2009 15:51:46 GMT
From:	tip-bot for John Kacur <jkacur@...hat.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	jkacur@...hat.com, airlied@...ux.ie, tglx@...utronix.de
Subject: [tip:bkl/drivers] agp: Remove the BKL from agp_open

Commit-ID:  55e858c8483af427144f33b42b818b30612b82b0
Gitweb:     http://git.kernel.org/tip/55e858c8483af427144f33b42b818b30612b82b0
Author:     John Kacur <jkacur@...hat.com>
AuthorDate: Sun, 11 Oct 2009 22:24:25 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 14 Oct 2009 17:36:54 +0200

agp: Remove the BKL from agp_open

- Remove the BKL from agp_open
- Perform a few clean-ups.

Analysis:
---------
int minor is local to the function.

The following are protected by agp_fe.agp_mutex
struct agp_file_private *priv;
struct agp_client *client;

Call-outs:

kzalloc should be safe to call under the mutex_lock

agp_find_client_by_pid:
	- agp_mmap calls that under agp_fe.agp_mutex which we hold in agp_open
	- agpioc_reserve_wrap calls it without any locking what-so-ever.
		- Is that an error? Or is that okay because it has pid that is
		  a unique handle?

agp_insert_file_private:
	- This function only manipulates struct agp_file_private, once again
	  while agp_fe.agp_mutex is held

Signed-off-by: John Kacur <jkacur@...hat.com>
Acked-by: David Airlie <airlied@...ux.ie>
LKML-Reference: <alpine.LFD.2.00.0910112216060.12574@...alhost.localdomain>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 drivers/char/agp/frontend.c |   28 +++++++++++-----------------
 1 files changed, 11 insertions(+), 17 deletions(-)

diff --git a/drivers/char/agp/frontend.c b/drivers/char/agp/frontend.c
index a96f319..43412c0 100644
--- a/drivers/char/agp/frontend.c
+++ b/drivers/char/agp/frontend.c
@@ -676,25 +676,25 @@ static int agp_open(struct inode *inode, struct file *file)
 	int minor = iminor(inode);
 	struct agp_file_private *priv;
 	struct agp_client *client;
-	int rc = -ENXIO;
-
-	lock_kernel();
-	mutex_lock(&(agp_fe.agp_mutex));
 
 	if (minor != AGPGART_MINOR)
-		goto err_out;
+		return -ENXIO;
+
+	mutex_lock(&(agp_fe.agp_mutex));
 
 	priv = kzalloc(sizeof(struct agp_file_private), GFP_KERNEL);
-	if (priv == NULL)
-		goto err_out_nomem;
+	if (priv == NULL) {
+		mutex_unlock(&(agp_fe.agp_mutex));
+		return -ENOMEM;
+	}
 
 	set_bit(AGP_FF_ALLOW_CLIENT, &priv->access_flags);
 	priv->my_pid = current->pid;
 
-	if (capable(CAP_SYS_RAWIO)) {
+	if (capable(CAP_SYS_RAWIO))
 		/* Root priv, can be controller */
 		set_bit(AGP_FF_ALLOW_CONTROLLER, &priv->access_flags);
-	}
+
 	client = agp_find_client_by_pid(current->pid);
 
 	if (client != NULL) {
@@ -704,16 +704,10 @@ static int agp_open(struct inode *inode, struct file *file)
 	file->private_data = (void *) priv;
 	agp_insert_file_private(priv);
 	DBG("private=%p, client=%p", priv, client);
-	mutex_unlock(&(agp_fe.agp_mutex));
-	unlock_kernel();
-	return 0;
 
-err_out_nomem:
-	rc = -ENOMEM;
-err_out:
 	mutex_unlock(&(agp_fe.agp_mutex));
-	unlock_kernel();
-	return rc;
+
+	return 0;
 }
 
 
--
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