linux-kernel - [PATCH v1 1/1] tty: serial: add missing spin_lock

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Date:   Sat,  9 May 2020 03:24:12 -0700
From:   Sagar Shrikant Kadam <sagar.kadam@...ive.com>
To:     gregkh@...uxfoundation.org, linux-serial@...r.kernel.org,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     palmer@...belt.com, paul.walmsley@...ive.com,
        aou@...s.berkeley.edu, atish.patra@....com, anup.patel@....com,
        Sagar Shrikant Kadam <sagar.kadam@...ive.com>
Subject: [PATCH v1 1/1] tty: serial: add missing spin_lock_init for SiFive serial console

An uninitialised spin lock for sifive serial console raises a bad
magic spin_lock error as reported and discussed here [1].
Initialising the spin lock resolves the issue.

The fix is tested on HiFive Unleashed A00 board with Linux 5.7-rc4
and OpenSBI v0.7

[1] https://lore.kernel.org/linux-riscv/b9fe49483a903f404e7acc15a6efbef756db28ae.camel@wdc.com

Fixes: 45c054d0815b ("tty: serial: add driver for the SiFive UART")
Reported-by: Atish Patra <Atish.Patra@....com>
Signed-off-by: Sagar Shrikant Kadam <sagar.kadam@...ive.com>
---
 drivers/tty/serial/sifive.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/tty/serial/sifive.c b/drivers/tty/serial/sifive.c
index 13eadcb..0b5110d 100644
--- a/drivers/tty/serial/sifive.c
+++ b/drivers/tty/serial/sifive.c
@@ -883,6 +883,7 @@ console_initcall(sifive_console_init);
 
 static void __ssp_add_console_port(struct sifive_serial_port *ssp)
 {
+	spin_lock_init(&ssp->port.lock);
 	sifive_serial_console_ports[ssp->port.line] = ssp;
 }
 
-- 
2.7.4