From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Jiri Slaby (SUSE)" <jirislaby@kernel.org>,
linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org
Cc: "Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>,
"Andy Shevchenko" <andriy.shevchenko@linux.intel.com>
Subject: [PATCH v1 1/1] serial: 8250_port: Drop duplicate NULL check
Date: Wed, 28 Jan 2026 15:27:26 +0100 [thread overview]
Message-ID: <20260128142726.128175-1-andriy.shevchenko@linux.intel.com> (raw)
serial8250_release_dma() is NULL-aware, no need to check this in the caller.
While at it, make sure DMA won't be used again, by NULLifying the pointer.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
drivers/tty/serial/8250/8250_port.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 21fdf84f118f..c40d750d5a4b 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -2366,8 +2366,8 @@ void serial8250_do_shutdown(struct uart_port *port)
synchronize_irq(port->irq);
- if (up->dma)
- serial8250_release_dma(up);
+ serial8250_release_dma(up);
+ up->dma = NULL;
scoped_guard(uart_port_lock_irqsave, port) {
if (port->flags & UPF_FOURPORT) {
--
2.50.1
next reply other threads:[~2026-01-28 14:27 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-28 14:27 Andy Shevchenko [this message]
2026-01-28 15:09 ` [PATCH v1 1/1] serial: 8250_port: Drop duplicate NULL check Ilpo Järvinen
2026-01-28 15:44 ` Andy Shevchenko
-- strict thread matches above, loose matches on Subject: below --
2026-03-02 15:27 Andy Shevchenko
2026-03-03 5:25 ` Jiri Slaby
2026-03-03 7:55 ` Andy Shevchenko
2026-03-03 8:26 ` Andy Shevchenko
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