diff options
author | Clark Williams <williams@redhat.com> | 2012-04-04 10:52:26 -0500 |
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committer | Clark Williams <williams@redhat.com> | 2012-04-04 10:52:26 -0500 |
commit | 2d93eaf2d4ace5853a74a4b0596f601aa62cb840 (patch) | |
tree | b0a2e2083c1749c4e3b8ae23db7bb13a7ca9aafe /fs/proc/proc_sysctl.c | |
parent | 003133585fc61d7bd36d3a097d7fde62e64a9550 (diff) | |
parent | 23d8c3f8f494c8516c9b4c05529e118e6a485956 (diff) |
Merge commit 'v3.2.14' into rt-3.2.14-rt23v3.2.14-rt23
Diffstat (limited to 'fs/proc/proc_sysctl.c')
-rw-r--r-- | fs/proc/proc_sysctl.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/fs/proc/proc_sysctl.c b/fs/proc/proc_sysctl.c index a6b62173d4c3..53c3bcea56cf 100644 --- a/fs/proc/proc_sysctl.c +++ b/fs/proc/proc_sysctl.c @@ -188,20 +188,32 @@ static ssize_t proc_sys_write(struct file *filp, const char __user *buf, static int proc_sys_open(struct inode *inode, struct file *filp) { + struct ctl_table_header *head = grab_header(inode); struct ctl_table *table = PROC_I(inode)->sysctl_entry; + /* sysctl was unregistered */ + if (IS_ERR(head)) + return PTR_ERR(head); + if (table->poll) filp->private_data = proc_sys_poll_event(table->poll); + sysctl_head_finish(head); + return 0; } static unsigned int proc_sys_poll(struct file *filp, poll_table *wait) { struct inode *inode = filp->f_path.dentry->d_inode; + struct ctl_table_header *head = grab_header(inode); struct ctl_table *table = PROC_I(inode)->sysctl_entry; - unsigned long event = (unsigned long)filp->private_data; unsigned int ret = DEFAULT_POLLMASK; + unsigned long event; + + /* sysctl was unregistered */ + if (IS_ERR(head)) + return POLLERR | POLLHUP; if (!table->proc_handler) goto out; @@ -209,6 +221,7 @@ static unsigned int proc_sys_poll(struct file *filp, poll_table *wait) if (!table->poll) goto out; + event = (unsigned long)filp->private_data; poll_wait(filp, &table->poll->wait, wait); if (event != atomic_read(&table->poll->event)) { @@ -217,6 +230,8 @@ static unsigned int proc_sys_poll(struct file *filp, poll_table *wait) } out: + sysctl_head_finish(head); + return ret; } |