linux-kernel - [PATCH AUTOSEL 4.9 08/14] sound: enable interrupt after dma buffer initialization

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Message-Id: <20181005161704.20704-8-sashal@kernel.org>
Date:   Fri,  5 Oct 2018 12:16:58 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Yu Zhao <yuzhao@...gle.com>, Mark Brown <broonie@...nel.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.9 08/14] sound: enable interrupt after dma buffer initialization

From: Yu Zhao <yuzhao@...gle.com>

[ Upstream commit b61749a89f826eb61fc59794d9e4697bd246eb61 ]

In snd_hdac_bus_init_chip(), we enable interrupt before
snd_hdac_bus_init_cmd_io() initializing dma buffers. If irq has
been acquired and irq handler uses the dma buffer, kernel may crash
when interrupt comes in.

Fix the problem by postponing enabling irq after dma buffer
initialization. And warn once on null dma buffer pointer during the
initialization.

Reviewed-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Yu Zhao <yuzhao@...gle.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 sound/hda/hdac_controller.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/sound/hda/hdac_controller.c b/sound/hda/hdac_controller.c
index 8761877207ec..00c6af2ae1c2 100644
--- a/sound/hda/hdac_controller.c
+++ b/sound/hda/hdac_controller.c
@@ -40,6 +40,8 @@ static void azx_clear_corbrp(struct hdac_bus *bus)
  */
 void snd_hdac_bus_init_cmd_io(struct hdac_bus *bus)
 {
+	WARN_ON_ONCE(!bus->rb.area);
+
 	spin_lock_irq(&bus->reg_lock);
 	/* CORB set up */
 	bus->corb.addr = bus->rb.addr;
@@ -478,13 +480,15 @@ bool snd_hdac_bus_init_chip(struct hdac_bus *bus, bool full_reset)
 	/* reset controller */
 	azx_reset(bus, full_reset);
 
-	/* initialize interrupts */
+	/* clear interrupts */
 	azx_int_clear(bus);
-	azx_int_enable(bus);
 
 	/* initialize the codec command I/O */
 	snd_hdac_bus_init_cmd_io(bus);
 
+	/* enable interrupts after CORB/RIRB buffers are initialized above */
+	azx_int_enable(bus);
+
 	/* program the position buffer */
 	if (bus->use_posbuf && bus->posbuf.addr) {
 		snd_hdac_chip_writel(bus, DPLBASE, (u32)bus->posbuf.addr);
-- 
2.17.1