linux-kernel - [PATCH 1/2 v2] pch_dma: Fix suspend issue

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Message-Id: <1318337002-10041-1-git-send-email-tomoya-linux@dsn.lapis-semi.com>
Date:	Tue, 11 Oct 2011 21:43:21 +0900
From:	Tomoya MORINAGA <tomoya-linux@....lapis-semi.com>
To:	Dan Williams <dan.j.williams@...el.com>,
	Vinod Koul <vinod.koul@...el.com>, linux-kernel@...r.kernel.org
Cc:	qi.wang@...el.com, yong.y.wang@...el.com, joel.clark@...el.com,
	kok.howg.ewe@...el.com,
	Tomoya MORINAGA <tomoya-linux@....lapis-semi.com>
Subject: [PATCH 1/2 v2] pch_dma: Fix suspend issue

Currently, executing suspend/hibernation,
memory access violation occurs.

In pch_dma_save_regs() called by suspend(),
you can see the following code.

static void pch_dma_save_regs(struct pch_dma *pd)
{
snip...
        list_for_each_entry_safe(chan, _c, &pd->dma.channels, device_node) {
                pd_chan = to_pd_chan(chan);

                pd->ch_regs[i].dev_addr = channel_readl(pd_chan, DEV_ADDR);
                pd->ch_regs[i].mem_addr = channel_readl(pd_chan, MEM_ADDR);
                pd->ch_regs[i].size = channel_readl(pd_chan, SIZE);
                pd->ch_regs[i].next = channel_readl(pd_chan, NEXT);

                i++;
        }
}

Max loop count is 12 defined at pci_table.
So, this caused memory access violation.

This patch fixes the issue
 - Modify array size (MAX_CHAN_NR)

Signed-off-by: Tomoya MORINAGA <tomoya-linux@....lapis-semi.com>
---
 drivers/dma/pch_dma.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/dma/pch_dma.c b/drivers/dma/pch_dma.c
index ff5b38f..e72bfeb 100644
--- a/drivers/dma/pch_dma.c
+++ b/drivers/dma/pch_dma.c
@@ -59,7 +59,7 @@
 #define DMA_DESC_FOLLOW_WITHOUT_IRQ	0x2
 #define DMA_DESC_FOLLOW_WITH_IRQ	0x3
 
-#define MAX_CHAN_NR			8
+#define MAX_CHAN_NR			12
 
 static unsigned int init_nr_desc_per_channel = 64;
 module_param(init_nr_desc_per_channel, uint, 0644);
-- 
1.7.4.4

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