linux-kernel - [PATCH v3 0/1] tty: serial: samsung: add spin_lock in console

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Message-Id: <20220407071619.102249-1-jaewon02.kim@samsung.com>
Date:   Thu,  7 Apr 2022 16:16:18 +0900
From:   Jaewon Kim <jaewon02.kim@...sung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-samsung-soc@...r.kernel.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Chanho Park <chanho61.park@...sung.com>,
        Jaewon Kim <jaewon02.kim@...sung.com>
Subject: [PATCH v3 0/1] tty: serial: samsung: add spin_lock in console_write

When console and printk log are printed at the same time,
they are called through tty driver and console driver concurrently.
In this case, this could lead to potintial issue that
data loss or fifo full.

This issue also occurred with other drivers and has been fixed.
"serial: amba-pl011: lock console writes against interrupts"
 - https://lkml.org/lkml/2012/2/1/495

---
Changes since v2:
 - value of lock is chanaged to true/false

Changes since v1:
 - locked variable type changed bool from int
 - spin_lock() changed to spin_lock_irqsave()

Jaewon Kim (1):
  tty: serial: samsung: add spin_lock for interrupt and console_write

 drivers/tty/serial/samsung_tty.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

-- 
2.35.1