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spi: amlogic: spifc-a4: Fix DMA mapping error handling

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Fix three bugs in aml_sfc_dma_buffer_setup() error paths:
1. Unnecessary goto: When the first DMA mapping (sfc->daddr) fails,
   nothing needs cleanup. Use direct return instead of goto.
2. Double-unmap bug: When info DMA mapping failed, the code would
   unmap sfc->daddr inline, then fall through to out_map_data which
   would unmap it again, causing a double-unmap.
3. Wrong unmap size: The out_map_info label used datalen instead of
   infolen when unmapping sfc->iaddr, which could lead to incorrect
   DMA sync behavior.

Fixes: 4670db6f32 ("spi: amlogic: add driver for Amlogic SPI Flash Controller")
Signed-off-by: Felix Gu <ustc.gu@gmail.com>
Link: https://patch.msgid.link/20260306-spifc-a4-v1-1-f22c9965f64a@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Felix Gu 2026-03-06 01:24:32 +08:00 committed by Mark Brown
parent 1f318b96cc
commit b20b437666
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GPG Key ID: 24D68B725D5487D0
1 changed files with 2 additions and 3 deletions
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5
drivers/spi/spi-amlogic-spifc-a4.c
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@ -411,7 +411,7 @@ static int aml_sfc_dma_buffer_setup(struct aml_sfc *sfc, void *databuf,
ret = dma_mapping_error(sfc->dev, sfc->daddr);
if (ret) {
dev_err(sfc->dev, "DMA mapping error\n");
goto out_map_data;
return ret;
}
cmd = CMD_DATA_ADDRL(sfc->daddr);
@ -429,7 +429,6 @@ static int aml_sfc_dma_buffer_setup(struct aml_sfc *sfc, void *databuf,
ret = dma_mapping_error(sfc->dev, sfc->iaddr);
if (ret) {
dev_err(sfc->dev, "DMA mapping error\n");
dma_unmap_single(sfc->dev, sfc->daddr, datalen, dir);
goto out_map_data;
}
@ -448,7 +447,7 @@ static int aml_sfc_dma_buffer_setup(struct aml_sfc *sfc, void *databuf,
return 0;
out_map_info:
dma_unmap_single(sfc->dev, sfc->iaddr, datalen, dir);
dma_unmap_single(sfc->dev, sfc->iaddr, infolen, dir);
out_map_data:
dma_unmap_single(sfc->dev, sfc->daddr, datalen, dir);