linux-kernel - [PATCH] dma: pl330: ensure DMA descriptors are zero-initialised

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Date:	Fri, 29 Nov 2013 11:50:28 +0000
From:	Will Deacon <will.deacon@....com>
To:	dmaengine@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Will Deacon <will.deacon@....com>,
	Jassi Brar <jaswinder.singh@...aro.org>,
	Vinod Koul <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>
Subject: [PATCH] dma: pl330: ensure DMA descriptors are zero-initialised

I see the following splat with 3.13-rc1 when attempting to perform DMA:

[  253.004516] Alignment trap: not handling instruction e1902f9f at [<c0204b40>]
[  253.004583] Unhandled fault: alignment exception (0x221) at 0xdfdfdfd7
[  253.004646] Internal error: : 221 [#1] PREEMPT SMP ARM
[  253.004691] Modules linked in: dmatest(+) [last unloaded: dmatest]
[  253.004798] CPU: 0 PID: 671 Comm: kthreadd Not tainted 3.13.0-rc1+ #2
[  253.004864] task: df9b0900 ti: df03e000 task.ti: df03e000
[  253.004937] PC is at dmaengine_unmap_put+0x14/0x34
[  253.005010] LR is at pl330_tasklet+0x3c8/0x550
[  253.005087] pc : [<c0204b44>]    lr : [<c0207478>]    psr: a00e0193
[  253.005087] sp : df03fe48  ip : 00000000  fp : df03bf18
[  253.005178] r10: bf00e108  r9 : 00000001  r8 : 00000000
[  253.005245] r7 : df837040  r6 : dfb41800  r5 : df837048  r4 : df837000
[  253.005316] r3 : dfdfdfcf  r2 : dfb41f80  r1 : df837048  r0 : dfdfdfd7
[  253.005384] Flags: NzCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
[  253.005459] Control: 30c5387d  Table: 9fb9ba80  DAC: fffffffd
[  253.005520] Process kthreadd (pid: 671, stack limit = 0xdf03e248)

This is due to desc->txd.unmap containing garbage (uninitialised memory).

Rather than add another dummy initialisation to _init_desc, instead
ensure that the descriptors are zero-initialised during allocation and
remove the dummy, per-field initialisation.

Cc: Jassi Brar <jaswinder.singh@...aro.org>
Cc: Vinod Koul <vinod.koul@...el.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Will Deacon <will.deacon@....com>
---
 drivers/dma/pl330.c | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 98641eaca080..79e52a94f054 100644
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -2492,14 +2492,8 @@ static dma_cookie_t pl330_tx_submit(struct dma_async_tx_descriptor *tx)
 
 static inline void _init_desc(struct dma_pl330_desc *desc)
 {
-	desc->pchan = NULL;
 	desc->req.x = &desc->px;
 	desc->req.token = desc;
-	desc->rqcfg.swap = SWAP_NO;
-	desc->rqcfg.privileged = 0;
-	desc->rqcfg.insnaccess = 0;
-	desc->rqcfg.scctl = SCCTRL0;
-	desc->rqcfg.dcctl = DCCTRL0;
 	desc->req.cfg = &desc->rqcfg;
 	desc->req.xfer_cb = dma_pl330_rqcb;
 	desc->txd.tx_submit = pl330_tx_submit;
@@ -2517,7 +2511,7 @@ static int add_desc(struct dma_pl330_dmac *pdmac, gfp_t flg, int count)
 	if (!pdmac)
 		return 0;
 
-	desc = kmalloc(count * sizeof(*desc), flg);
+	desc = kzalloc(count * sizeof(*desc), flg);
 	if (!desc)
 		return 0;
 
-- 
1.8.2.2

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