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Groups > linux.kernel > #1535040
| From | Pan Bian <bianpan2016@163.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 2/2] dmaengine: ioat: set error code on failures |
| Date | 2016-12-02 17:00 +0100 |
| Message-ID | <sJYpH-5KC-9@gated-at.bofh.it> (permalink) |
| Organization | linux.* mail to news gateway |
In function ioat_xor_val_self_test(), when the calls to
dma_mapping_error() fail, the value of return variable err is 0
(indicates no error). As a result, the return value may be inconsistent
with the execution status. This patch fixes the bug by assigning
"-ENOMEM" to err on the error path.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=188601
Signed-off-by: Pan Bian <bianpan2016@163.com>
---
drivers/dma/ioat/init.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/dma/ioat/init.c b/drivers/dma/ioat/init.c
index 32383ef..3d589f4 100644
--- a/drivers/dma/ioat/init.c
+++ b/drivers/dma/ioat/init.c
@@ -829,16 +829,20 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma)
op = IOAT_OP_XOR;
dest_dma = dma_map_page(dev, dest, 0, PAGE_SIZE, DMA_FROM_DEVICE);
- if (dma_mapping_error(dev, dest_dma))
+ if (dma_mapping_error(dev, dest_dma)) {
+ err = -ENOMEM;
goto free_resources;
+ }
for (i = 0; i < IOAT_NUM_SRC_TEST; i++)
dma_srcs[i] = DMA_ERROR_CODE;
for (i = 0; i < IOAT_NUM_SRC_TEST; i++) {
dma_srcs[i] = dma_map_page(dev, xor_srcs[i], 0, PAGE_SIZE,
DMA_TO_DEVICE);
- if (dma_mapping_error(dev, dma_srcs[i]))
+ if (dma_mapping_error(dev, dma_srcs[i])) {
+ err = -ENOMEM;
goto dma_unmap;
+ }
}
tx = dma->device_prep_dma_xor(dma_chan, dest_dma, dma_srcs,
IOAT_NUM_SRC_TEST, PAGE_SIZE,
@@ -906,8 +910,10 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma)
for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) {
dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
DMA_TO_DEVICE);
- if (dma_mapping_error(dev, dma_srcs[i]))
+ if (dma_mapping_error(dev, dma_srcs[i])) {
+ err = -ENOMEM;
goto dma_unmap;
+ }
}
tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
@@ -959,8 +965,10 @@ static int ioat_xor_val_self_test(struct ioatdma_device *ioat_dma)
for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) {
dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE,
DMA_TO_DEVICE);
- if (dma_mapping_error(dev, dma_srcs[i]))
+ if (dma_mapping_error(dev, dma_srcs[i])) {
+ err = -ENOMEM;
goto dma_unmap;
+ }
}
tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs,
IOAT_NUM_SRC_TEST + 1, PAGE_SIZE,
--
1.9.1
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[PATCH 2/2] dmaengine: ioat: set error code on failures Pan Bian <bianpan2016@163.com> - 2016-12-02 17:00 +0100
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