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RDMA/ucma: BKL is not needed for ucma_open()

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Remove explicit lock_kernel() calls and document why the code is safe.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Roland Dreier 2008-07-24 20:36:59 -07:00
parent fb2e405fc1
commit f7a6117ee5
1 changed files with 8 additions and 3 deletions
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11
drivers/infiniband/core/ucma.c
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@ -38,7 +38,6 @@
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/miscdevice.h>
#include <linux/smp_lock.h>
#include <rdma/rdma_user_cm.h>
#include <rdma/ib_marshall.h>
@ -1149,6 +1148,14 @@ static unsigned int ucma_poll(struct file *filp, struct poll_table_struct *wait)
return mask;
}
/*
* ucma_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 ucma_open(struct inode *inode, struct file *filp)
{
struct ucma_file *file;
@ -1157,7 +1164,6 @@ static int ucma_open(struct inode *inode, struct file *filp)
if (!file)
return -ENOMEM;
lock_kernel();
INIT_LIST_HEAD(&file->event_list);
INIT_LIST_HEAD(&file->ctx_list);
init_waitqueue_head(&file->poll_wait);
@ -1165,7 +1171,6 @@ static int ucma_open(struct inode *inode, struct file *filp)
filp->private_data = file;
file->filp = filp;
unlock_kernel();
return 0;
}