linux-kernel - [PATCH] drivers: of: of_reserved_mem: fixup the CMA alignment not to affect dma-coherent

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [day] [month] [year] [list]

Message-id: <1931335297.775331463393198643.JavaMail.weblogic@ep2mlwas08b>
Date:	Mon, 16 May 2016 10:06:40 +0000 (GMT)
From:	Jaewon Kim <jaewon31.kim@...sung.com>
To:	robh+dt@...nel.org
Cc:	r64343@...escale.com, m.szyprowski@...sung.com,
	grant.likely@...aro.org, jaewon31.kim@...il.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH] drivers: of: of_reserved_mem: fixup the CMA alignment not to
 affect dma-coherent

There was an alignment mismatch issue for CMA and it was fixed by
commit 1cc8e3458b51 ("drivers: of: of_reserved_mem: fixup the alignment with CMA setup").
However the way of the commit considers not only dma-contiguous(CMA) but also
dma-coherent which has no that requirement.

This patch checks more to distinguish dma-contiguous(CMA) from dma-coherent.

Signed-off-by: Jaewon <jaewon31.kim@...sung.com>
---
 drivers/of/of_reserved_mem.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index ed01c01..45b873e 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c
@@ -127,7 +127,10 @@ static int __init __reserved_mem_alloc_size(unsigned long node,
 	}
 
 	/* Need adjust the alignment to satisfy the CMA requirement */
-	if (IS_ENABLED(CONFIG_CMA) && of_flat_dt_is_compatible(node, "shared-dma-pool"))
+	if (IS_ENABLED(CONFIG_CMA)
+	    && of_flat_dt_is_compatible(node, "shared-dma-pool")
+	    && of_get_flat_dt_prop(node, "reusable", NULL)
+	    && !of_get_flat_dt_prop(node, "no-map", NULL)) {
 		align = max(align, (phys_addr_t)PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order));
 
 	prop = of_get_flat_dt_prop(node, "alloc-ranges", &len);