[PATCH] dmaengine: at_hdmac: do exception handling appropriately in at_dma_xlate()
From: Yu Kuai <hidden>
Date: 2020-07-29 12:29:02
Also in:
dmaengine, lkml
Subsystem:
dma generic offload engine subsystem, microchip at91 dma drivers, the rest · Maintainers:
Vinod Koul, Ludovic Desroches, Linus Torvalds
Do several things for exception handing:
a. check return value of of_find_device_by_node().
b. call put_device() if memory allocation for 'atslave' failed.
c. if dma_request_channel() failed, call put_device() and kfree().
Fixes: bbe89c8e3d59 ("at_hdmac: move to generic DMA binding")
Signed-off-by: Yu Kuai <redacted>
---
drivers/dma/at_hdmac.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index 45bbcd6146fd..a2cf25c6e3b3 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c@@ -1650,13 +1650,17 @@ static struct dma_chan *at_dma_xlate(struct of_phandle_args *dma_spec, return NULL; dmac_pdev = of_find_device_by_node(dma_spec->np); + if (!dmac_pdev) + return NULL; dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); atslave = kmalloc(sizeof(*atslave), GFP_KERNEL); - if (!atslave) + if (!atslave) { + put_device(&dmac_pdev->dev); return NULL; + } atslave->cfg = ATC_DST_H2SEL_HW | ATC_SRC_H2SEL_HW; /*
@@ -1685,8 +1689,11 @@ static struct dma_chan *at_dma_xlate(struct of_phandle_args *dma_spec, atslave->dma_dev = &dmac_pdev->dev; chan = dma_request_channel(mask, at_dma_filter, atslave); - if (!chan) + if (!chan) { + put_device(&dmac_pdev->dev); + kfree(atslave); return NULL; + } atchan = to_at_dma_chan(chan); atchan->per_if = dma_spec->args[0] & 0xff;
--
2.25.4
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