Input: do not corrupt system-wide procfs fops.

entry->proc_fops is a pointer to struct file_operations. When we
call create_proc_entry(...), it pointis to proc_file_operations,
deep in fs/proc/generic.c. By adding a 'poll' member to this struct
we effectively force the 'poll' member on every file in /proc,
which is wrong (they all fail select(...) calls).

This patch changes a copy of entry->proc_fops and reassigns it rather
than changing the original member.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/input/input.c b/drivers/input/input.c
index 1885f369e3e2..c1dbc04cf54a 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -697,6 +697,8 @@ static int input_handlers_read(char *buf, char **start, off_t pos, int count, in
         return (count > cnt) ? cnt : count;
 }
 
+static struct file_operations input_fileops;
+
 static int __init input_proc_init(void)
 {
         struct proc_dir_entry *entry;
@@ -711,6 +713,8 @@ static int __init input_proc_init(void)
                 return -ENOMEM;
         }
         entry->owner = THIS_MODULE;
+        input_fileops = *entry->proc_fops;
+        entry->proc_fops = &input_fileops;
         entry->proc_fops->poll = input_devices_poll;
         entry = create_proc_read_entry("handlers", 0, proc_bus_input_dir, input_handlers_read, NULL);
         if (entry == NULL) {