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From: Stephen Boyd <swboyd@chromium.org>
To: Daniel Thompson <daniel.thompson@linaro.org>,
	Douglas Anderson <dianders@chromium.org>,
	Jason Wessel <jason.wessel@windriver.com>,
	gregkh@linuxfoundation.org, mingo@kernel.org, tglx@linutronix.de
Cc: linux-arm-msm@vger.kernel.org,
	kgdb-bugreport@lists.sourceforge.net,
	Douglas Anderson <dianders@chromium.org>,
	linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org,
	jslaby@suse.com
Subject: Re: [PATCH 1/7] serial: qcom_geni_serial: Finish supporting sysrq
Date: Fri, 02 Nov 2018 09:47:07 -0700	[thread overview]
Message-ID: <154117722795.88331.829582703808332252@swboyd.mtv.corp.google.com> (raw)
In-Reply-To: <20181029180707.207546-2-dianders@chromium.org>

Quoting Douglas Anderson (2018-10-29 11:07:01)
> The geni serial driver already had some sysrq code in it, but since
> SUPPORT_SYSRQ wasn't defined the code didn't do anything useful.
> Let's make it useful by adding that define using the same formula
> found in other serial drivers.
> 
> In order to prevent deadlock, we'll take a page from the
> 'msm_serial.c' where the spinlock is released around
> uart_handle_sysrq_char().  This seemed better than copying from
> '8250_port.c' where we skip locking in the console_write function
> since the '8250_port.c' method can cause lockdep warnings when
> dropping into kgdb.
> 
> Signed-off-by: Douglas Anderson <dianders@chromium.org>

Given that it's the same as msm_serial.c, and I wrote the msm_serial.c
"hack" then:

Reviewed-by: Stephen Boyd <swboyd@chromium.org>


  reply	other threads:[~2018-11-02 16:47 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-29 18:07 [PATCH 0/7] serial: Finish kgdb on qcom_geni; fix many lockdep splats w/ kgdb Douglas Anderson
2018-10-29 18:07 ` [PATCH 1/7] serial: qcom_geni_serial: Finish supporting sysrq Douglas Anderson
2018-11-02 16:47   ` Stephen Boyd [this message]
2018-10-29 18:07 ` [PATCH 2/7] serial: core: Allow processing sysrq at port unlock time Douglas Anderson
2018-10-30  5:31   ` Doug Anderson
2018-10-29 18:07 ` [PATCH 3/7] serial: qcom_geni_serial: Process " Douglas Anderson
2018-10-29 18:07 ` [PATCH 4/7] serial: core: Include console.h from serial_core.h Douglas Anderson
2018-10-29 18:07 ` [PATCH 5/7] serial: 8250: Process sysrq at port unlock time Douglas Anderson
2018-10-29 18:07 ` [PATCH 6/7] smp: Don't yell about IRQs disabled in kgdb_roundup_cpus() Douglas Anderson
2018-10-30  8:25   ` Peter Zijlstra
2018-10-30  9:41   ` Daniel Thompson
2018-10-30 22:21     ` Doug Anderson
2018-10-29 18:07 ` [PATCH 7/7] kgdb: Remove irq flags and local_irq_enable/disable from roundup Douglas Anderson
2018-10-30 11:46   ` Daniel Thompson
2018-10-30 22:22     ` Doug Anderson
2018-10-30 11:56 ` [PATCH 0/7] serial: Finish kgdb on qcom_geni; fix many lockdep splats w/ kgdb Daniel Thompson
2018-10-30 12:31   ` Russell King - ARM Linux
2018-10-30 12:36 ` Andy Shevchenko

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