Revert "tty: hvc: Fix data abort due to race in hvc_open"

This reverts commit e2bd1dcbe1aa34ff5570b3427c530e4332ecf0fe.

In discussion on the mailing list, it has been determined that this is
not the correct type of fix for this issue.  Revert it so that we can do
this correctly.

Reported-by: Jiri Slaby <jslaby@suse.cz>
Reported-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20200428032601.22127-1-rananta@codeaurora.org
Cc: Raghavendra Rao Ananta <rananta@codeaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c
index ebe26fe5ac09dff48fa43281739961d9dd2a3c9b..436cc51c92c39765f9e9ba782fabecf62dda4830 100644 (file)
--- a/drivers/tty/hvc/hvc_console.c
+++ b/drivers/tty/hvc/hvc_console.c
@@ -75,8 +75,6 @@ static LIST_HEAD(hvc_structs);
  */
 static DEFINE_MUTEX(hvc_structs_mutex);
 
-/* Mutex to serialize hvc_open */
-static DEFINE_MUTEX(hvc_open_mutex);
 /*
  * This value is used to assign a tty->index value to a hvc_struct based
  * upon order of exposure via hvc_probe(), when we can not match it to
@@ -348,24 +346,16 @@ static int hvc_install(struct tty_driver *driver, struct tty_struct *tty)
  */
 static int hvc_open(struct tty_struct *tty, struct file * filp)
 {
-       struct hvc_struct *hp;
+       struct hvc_struct *hp = tty->driver_data;
        unsigned long flags;
        int rc = 0;
 
-       mutex_lock(&hvc_open_mutex);
-
-       hp = tty->driver_data;
-       if (!hp) {
-               rc = -EIO;
-               goto out;
-       }
-
        spin_lock_irqsave(&hp->port.lock, flags);
        /* Check and then increment for fast path open. */
        if (hp->port.count++ > 0) {
                spin_unlock_irqrestore(&hp->port.lock, flags);
                hvc_kick();
-               goto out;
+               return 0;
        } /* else count == 0 */
        spin_unlock_irqrestore(&hp->port.lock, flags);
 
@@ -394,8 +384,6 @@ static int hvc_open(struct tty_struct *tty, struct file * filp)
        /* Force wakeup of the polling thread */
        hvc_kick();
 
-out:
-       mutex_unlock(&hvc_open_mutex);
        return rc;
 }