linux-kernel - [PATCH] RDMA/ucm: BKL is not needed for ib_ucm

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Message-ID: <adaprpedfwq.fsf@cisco.com>
Date:	Tue, 15 Jul 2008 13:57:25 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	general@...ts.openfabrics.org, linux-kernel@...r.kernel.org
Cc:	Jonathan Corbet <corbet@....net>, sean.hefty@...el.com
Subject: [PATCH] RDMA/ucm: BKL is not needed for ib_ucm_open()

Remove explicit cycle_kernel_lock() call and document why the code is safe.

Signed-off-by: Roland Dreier <rolandd@...co.com>
---
And merge this too...

 drivers/infiniband/core/ucm.c |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/core/ucm.c b/drivers/infiniband/core/ucm.c
index 9494005..e603736 100644
--- a/drivers/infiniband/core/ucm.c
+++ b/drivers/infiniband/core/ucm.c
@@ -43,7 +43,6 @@
 #include <linux/cdev.h>
 #include <linux/idr.h>
 #include <linux/mutex.h>
-#include <linux/smp_lock.h>
 
 #include <asm/uaccess.h>
 
@@ -1154,11 +1153,18 @@ static unsigned int ib_ucm_poll(struct file *filp,
 	return mask;
 }
 
+/*
+ * ib_ucm_open() does not need the BKL:
+ *
+ *  - no global state is referred to;
+ *  - there is no ioctl method to race against;
+ *  - no further module initialization is required for open to work
+ *    after the device is registered.
+ */
 static int ib_ucm_open(struct inode *inode, struct file *filp)
 {
 	struct ib_ucm_file *file;
 
-	cycle_kernel_lock();
 	file = kmalloc(sizeof(*file), GFP_KERNEL);
 	if (!file)
 		return -ENOMEM;
-- 
1.5.6.2

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