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authorRussell King <rmk+kernel@arm.linux.org.uk>2013-12-13 03:59:08 +0400
committerDan Williams <dan.j.williams@intel.com>2013-12-13 10:48:53 +0400
commit0be8253fa2b4385e6246387db1d6067366e987ba (patch)
treee798be82ec569d306f4eae19a4c87544b30fb3b8 /drivers/dma/mv_xor.c
parentd16695a75019ac4baad7a117dc86d1d292e09115 (diff)
downloadlinux-0be8253fa2b4385e6246387db1d6067366e987ba.tar.xz
dmaengine: mv_xor: fix oops when channels fail to initialise
When a channel fails to initialise, we error out and clean up any previously unregistered channels by walking the entire xordev->channels array. Unfortunately, there are paths which end up storing an error pointer in this array, which we then try and dereference in the cleanup code, which causes an oops. Fix this by avoiding writing invalid pointers to this array in the first place. Tested-by: Aaro Koskinen <aaro.koskinen@iki.fi> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma/mv_xor.c')
-rw-r--r--drivers/dma/mv_xor.c24
1 files changed, 13 insertions, 11 deletions
diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
index 79620887d637..53fb0c8365b0 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -1199,6 +1199,7 @@ static int mv_xor_probe(struct platform_device *pdev)
int i = 0;
for_each_child_of_node(pdev->dev.of_node, np) {
+ struct mv_xor_chan *chan;
dma_cap_mask_t cap_mask;
int irq;
@@ -1216,21 +1217,21 @@ static int mv_xor_probe(struct platform_device *pdev)
goto err_channel_add;
}
- xordev->channels[i] =
- mv_xor_channel_add(xordev, pdev, i,
- cap_mask, irq);
- if (IS_ERR(xordev->channels[i])) {
- ret = PTR_ERR(xordev->channels[i]);
- xordev->channels[i] = NULL;
+ chan = mv_xor_channel_add(xordev, pdev, i,
+ cap_mask, irq);
+ if (IS_ERR(chan)) {
+ ret = PTR_ERR(chan);
irq_dispose_mapping(irq);
goto err_channel_add;
}
+ xordev->channels[i] = chan;
i++;
}
} else if (pdata && pdata->channels) {
for (i = 0; i < MV_XOR_MAX_CHANNELS; i++) {
struct mv_xor_channel_data *cd;
+ struct mv_xor_chan *chan;
int irq;
cd = &pdata->channels[i];
@@ -1245,13 +1246,14 @@ static int mv_xor_probe(struct platform_device *pdev)
goto err_channel_add;
}
- xordev->channels[i] =
- mv_xor_channel_add(xordev, pdev, i,
- cd->cap_mask, irq);
- if (IS_ERR(xordev->channels[i])) {
- ret = PTR_ERR(xordev->channels[i]);
+ chan = mv_xor_channel_add(xordev, pdev, i,
+ cd->cap_mask, irq);
+ if (IS_ERR(chan)) {
+ ret = PTR_ERR(chan);
goto err_channel_add;
}
+
+ xordev->channels[i] = chan;
}
}