linux-kernel - Re: [PATCH] tty: owl-uart: fix call balance of owl

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Message-ID: <20250219174846.t4eso3o2aug6rb47@thinkpad>
Date: Wed, 19 Feb 2025 23:18:46 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Fedor Pchelkin <pchelkin@...ras.ru>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Vitalii Mordan <mordan@...ras.ru>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	Andreas Färber <afaerber@...e.de>,
	Jeff Johnson <quic_jjohnson@...cinc.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Uwe Kleine-König <u.kleine-koenig@...libre.com>,
	Amit Singh Tomar <amittomer25@...il.com>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-actions@...ts.infradead.org,
	Alexey Khoroshilov <khoroshilov@...ras.ru>,
	Vadim Mutilin <mutilin@...ras.ru>, lvc-project@...uxtesting.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] tty: owl-uart: fix call balance of owl_port->clk
 handling routines

On Fri, Feb 14, 2025 at 09:39:09PM +0300, Fedor Pchelkin wrote:
> On Fri, 14. Feb 22:44, Manivannan Sadhasivam wrote:
> > On Thu, Feb 13, 2025 at 02:24:16PM +0300, Vitalii Mordan wrote:
> > > If owl_port->clk was enabled in owl_uart_probe(), it must be disabled in
> > > all error paths to ensure proper cleanup. However, if uart_add_one_port()
> > > returns an error in owl_uart_probe(), the owl_port->clk clock will not be
> > > disabled.
> > > 
> > > Use the devm_clk_get_enabled() helper function to ensure proper call
> > > balance for owl_port->clk.
> > > 
> > 
> > Do not use newly introduced APIs to fix old bugs. The bug should be fixed
> > separately to allow backporting and the conversion should be done on top.
> 
> These relatively new helpers are already available in all currently
> supported stable kernels including 5.4.y.
> 
> Commit 7ef9651e9792 ("clk: Provide new devm_clk helpers for prepared and
> enabled clocks") was conveniently backported there as a dependency for
> the similar bug fixes.

Ah, then fine with me.

- Mani

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