linux-kernel - [PATCH 5.4 346/453] ALSA: core: memalloc: add page alignment for iram

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Date:   Mon, 28 Dec 2020 13:49:42 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Robin Gong <yibin.gong@....com>,
        Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 5.4 346/453] ALSA: core: memalloc: add page alignment for iram

From: Robin Gong <yibin.gong@....com>

commit 74c64efa1557fef731b59eb813f115436d18078e upstream.

Since mmap for userspace is based on page alignment, add page alignment
for iram alloc from pool, otherwise, some good data located in the same
page of dmab->area maybe touched wrongly by userspace like pulseaudio.

Signed-off-by: Robin Gong <yibin.gong@....com>
Cc: <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/1608221747-3474-1-git-send-email-yibin.gong@nxp.com
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/core/memalloc.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/sound/core/memalloc.c
+++ b/sound/core/memalloc.c
@@ -76,7 +76,8 @@ static void snd_malloc_dev_iram(struct s
 	/* Assign the pool into private_data field */
 	dmab->private_data = pool;
 
-	dmab->area = gen_pool_dma_alloc(pool, size, &dmab->addr);
+	dmab->area = gen_pool_dma_alloc_align(pool, size, &dmab->addr,
+					PAGE_SIZE);
 }
 
 /**