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| author | Will Deacon <will.deacon@arm.com> | 2013-12-02 19:01:30 +0100 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2013-12-18 19:08:56 +0100 |
| commit | 0baf8f6a2ac86c2c40ed0cacab8ea3d17371a1bb (patch) | |
| tree | 421872d20b46c4c1ddb1094d24e9fa087e48dc50 /drivers | |
| parent | dmaengine: fix sleep in atomic (diff) | |
| download | linux-0baf8f6a2ac86c2c40ed0cacab8ea3d17371a1bb.tar.xz linux-0baf8f6a2ac86c2c40ed0cacab8ea3d17371a1bb.zip | |
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: Andriy Shevchenko <andriy.shevchenko@intel.com>
Acked-by: Jassi Brar <jassisinghbrar@gmail.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/dma/pl330.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c index cdf0483b8f2d..536632f6479c 100644 --- a/drivers/dma/pl330.c +++ b/drivers/dma/pl330.c @@ -2492,12 +2492,9 @@ 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; @@ -2517,7 +2514,7 @@ 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 = kcalloc(count, sizeof(*desc), flg); if (!desc) return 0; |