diff options
| author | Jonathan Corbet <corbet@lwn.net> | 2008-05-15 16:24:25 -0600 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2008-06-20 14:05:49 -0600 |
| commit | 20613f24bcd1cbfb08e64f0bb00c44481313b448 (patch) | |
| tree | 766f9e57841470ea3cfdabb10b844a2b4112f5c7 | |
| parent | 1bcaa0bd6fd5b510dd9f1ba2da114d3f1253af61 (diff) | |
usbcore: cdev lock_kernel() pushdown
usb_open() is protected by a down_read(&minor_rwsem), but I'm not sure I
trust it to protect everything including subsidiary open() functions.
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| -rw-r--r-- | drivers/usb/core/file.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/core/file.c b/drivers/usb/core/file.c index 8133c99c6c5..c6a95395e52 100644 --- a/drivers/usb/core/file.c +++ b/drivers/usb/core/file.c @@ -18,6 +18,7 @@ #include <linux/module.h> #include <linux/errno.h> #include <linux/rwsem.h> +#include <linux/smp_lock.h> #include <linux/usb.h> #include "usb.h" @@ -33,6 +34,7 @@ static int usb_open(struct inode * inode, struct file * file) int err = -ENODEV; const struct file_operations *old_fops, *new_fops = NULL; + lock_kernel(); down_read(&minor_rwsem); c = usb_minors[minor]; @@ -51,6 +53,7 @@ static int usb_open(struct inode * inode, struct file * file) fops_put(old_fops); done: up_read(&minor_rwsem); + unlock_kernel(); return err; } |