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Subject[PATCH][v2] check for dma mapping error in ioat_dma_self_test
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This patch fixes a warning in ioat_dma_self_test when DMA_API_DEBUG is enabled. The warning is:

[ 1.581984] ioatdma: Intel(R) QuickData Technology Driver 4.00
[ 1.582095] bus: 'pci': add driver ioatdma
[ 1.582102] bus: 'pci': driver_probe_device: matched device 0000:00:04.0 with driver ioatdma
[ 1.582104] bus: 'pci': really_probe: probing driver ioatdma with device 0000:00:04.0
[ 1.582175] ioatdma 0000:00:04.0: can't derive routing for PCI INT A
[ 1.582281] ioatdma 0000:00:04.0: PCI INT A: no GSI
[ 1.582552] ioatdma 0000:00:04.0: irq 52 for MSI/MSI-X
[ 1.582631] Set context mapping for 00:04.0
[ 1.582920] ------------[ cut here ]------------
[ 1.583027] WARNING: at lib/dma-debug.c:933 check_unmap+0x645/0x6f1()
[ 1.583132] Hardware name: To be filled by O.E.M.
[ 1.583236] ioatdma 0000:00:04.0: DMA-API: device driver failed to check map error[device address=0x00000000ffff9800] [size=2000 bytes] [mapped as single]Modules linked in:
[ 1.583240] Pid: 1, comm: swapper/0 Not tainted 3.9.0-rc1-dirty #248
[ 1.583241] Call Trace:
[ 1.583244] [<ffffffff8103d98e>] warn_slowpath_common+0x85/0x9f
[ 1.583246] [<ffffffff8103da4b>] warn_slowpath_fmt+0x46/0x48
[ 1.583248] [<ffffffff81257a7b>] check_unmap+0x645/0x6f1
[ 1.583251] [<ffffffff81505e10>] ? _raw_spin_unlock_irqrestore+0x3f/0x55
[ 1.583253] [<ffffffff81257d07>] debug_dma_unmap_page+0x59/0x5b
[ 1.583256] [<ffffffff812ea925>] dma_unmap_single_attrs.clone.2+0x6a/0x73
[ 1.583258] [<ffffffff812eb3b7>] ioat_dma_self_test+0x228/0x29d
[ 1.583260] [<ffffffff8150449a>] ? __wait_for_common+0xe7/0x15a
[ 1.583263] [<ffffffff812ef74d>] ioat3_dma_self_test+0x16/0x29
[ 1.583264] [<ffffffff812e9be9>] ioat_probe+0xbc/0xea
[ 1.583266] [<ffffffff812ed1fb>] ioat3_dma_probe+0x1d3/0x275
[ 1.583268] [<ffffffff812e9135>] ioat_pci_probe+0x14d/0x178
[ 1.583271] [<ffffffff812650a7>] local_pci_probe+0x3e/0x66
[ 1.583273] [<ffffffff81265179>] __pci_device_probe+0xaa/0xc3
[ 1.583275] [<ffffffff8131fce7>] ? get_device+0x19/0x1f
[ 1.583277] [<ffffffff81265c06>] pci_device_probe+0x35/0x50
[ 1.583280] [<ffffffff81323960>] really_probe+0xda/0x29c
[ 1.583282] [<ffffffff8132e2dd>] ? pm_runtime_barrier+0x70/0x99
[ 1.583284] [<ffffffff81323b96>] driver_probe_device+0x74/0x8d
[ 1.583286] [<ffffffff81323c10>] __driver_attach+0x61/0x85
[ 1.583288] [<ffffffff81323baf>] ? driver_probe_device+0x8d/0x8d
[ 1.583289] [<ffffffff81323baf>] ? driver_probe_device+0x8d/0x8d
[ 1.583291] [<ffffffff81321f3a>] bus_for_each_dev+0x58/0x96
[ 1.583293] [<ffffffff813236d5>] driver_attach+0x1e/0x20
[ 1.583295] [<ffffffff813230ba>] bus_add_driver+0xed/0x223
[ 1.583298] [<ffffffff81ce06b9>] ? dma_bus_init+0x19/0x19
[ 1.583300] [<ffffffff813241f0>] driver_register+0x8f/0x108
[ 1.583301] [<ffffffff81ce06b9>] ? dma_bus_init+0x19/0x19
[ 1.583303] [<ffffffff81265d10>] __pci_register_driver+0x64/0x68
[ 1.583305] [<ffffffff81ce0721>] ioat_init_module+0x68/0x80
[ 1.583307] [<ffffffff81cdf92e>] ? setup_erst_disable+0x12/0x12
[ 1.583310] [<ffffffff81000237>] do_one_initcall+0x7f/0x133
[ 1.583312] [<ffffffff81cb27a6>] do_basic_setup+0x9c/0xba
[ 1.583314] [<ffffffff81cb28f0>] ? kernel_init_freeable+0x12c/0x12c
[ 1.583316] [<ffffffff81cb2877>] kernel_init_freeable+0xb3/0x12c
[ 1.583318] [<ffffffff814f7324>] ? rest_init+0xd8/0xd8
[ 1.583320] [<ffffffff814f7332>] kernel_init+0xe/0xdb
[ 1.583322] [<ffffffff8150d4dc>] ret_from_fork+0x7c/0xb0
[ 1.583324] [<ffffffff814f7324>] ? rest_init+0xd8/0xd8
[ 1.583340] ---[ end trace a5a9423f147d46b4 ]---
[ 1.583443] Mapped at:
[ 1.583545] [<ffffffff81258192>] debug_dma_map_page+0x4c/0xec
[ 1.583547] [<ffffffff812ea8a8>] dma_map_single_attrs.clone.1+0xe3/0xf6
[ 1.583549] [<ffffffff812eb260>] ioat_dma_self_test+0xd1/0x29d
[ 1.583550] [<ffffffff812ef74d>] ioat3_dma_self_test+0x16/0x29
[ 1.583552] [<ffffffff812e9be9>] ioat_probe+0xbc/0xea

Applies to 3.9-rc1


Signed-off-by: Andrew Cooks <acooks@gmail.com>
---
drivers/dma/ioat/dma.c | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index 1879a59..5431ba8 100644
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -832,7 +832,18 @@ int ioat_dma_self_test(struct ioatdma_device *device)
}

dma_src = dma_map_single(dev, src, IOAT_TEST_SIZE, DMA_TO_DEVICE);
+ if (dma_mapping_error(dev, dma_src)) {
+ dev_err(dev, "dma mapping failed.\n");
+ goto free_resources;
+ }
+
dma_dest = dma_map_single(dev, dest, IOAT_TEST_SIZE, DMA_FROM_DEVICE);
+ if (dma_mapping_error(dev, dma_dest)) {
+ dev_err(dev, "dma mapping failed.\n");
+ dma_unmap_single(dev, dma_src, IOAT_TEST_SIZE, DMA_TO_DEVICE);
+ goto free_resources;
+ }
+
flags = DMA_COMPL_SKIP_SRC_UNMAP | DMA_COMPL_SKIP_DEST_UNMAP |
DMA_PREP_INTERRUPT;
tx = device->common.device_prep_dma_memcpy(dma_chan, dma_dest, dma_src,
--
1.7.1


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