Patch "n_tty: Rename tail to old_tail in n_tty_read()" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    n_tty: Rename tail to old_tail in n_tty_read()

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     n_tty-rename-tail-to-old_tail-in-n_tty_read.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 46947742388959c672d059772208ccb938fef065
Author: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Date:   Fri Nov 11 16:25:02 2022 +0200

    n_tty: Rename tail to old_tail in n_tty_read()
    
    [ Upstream commit 947d66b68f3c4e7cf8f3f3500807b9d2a0de28ce ]
    
    The local tail variable in n_tty_read() is used for one purpose, it
    keeps the old tail. Thus, rename it appropriately to improve code
    readability.
    
    Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
    Reviewed-by: Jiri Slaby <jirislaby@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/22b37499-ff9a-7fc1-f6e0-58411328d122@xxxxxxxxxxxxxxx
    Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
    Stable-dep-of: 4903fde8047a ("tty: fix hang on tty device with no_room set")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 891036bd9f897..8f57448e1ce46 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -2100,7 +2100,7 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
 	ssize_t retval = 0;
 	long timeout;
 	bool packet;
-	size_t tail;
+	size_t old_tail;
 
 	/*
 	 * Is this a continuation of a read started earler?
@@ -2163,7 +2163,7 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
 	}
 
 	packet = tty->ctrl.packet;
-	tail = ldata->read_tail;
+	old_tail = ldata->read_tail;
 
 	add_wait_queue(&tty->read_wait, &wait);
 	while (nr) {
@@ -2252,7 +2252,7 @@ static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
 		if (time)
 			timeout = time;
 	}
-	if (tail != ldata->read_tail)
+	if (old_tail != ldata->read_tail)
 		n_tty_kick_worker(tty);
 	up_read(&tty->termios_rwsem);