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crypto: omap-sham - Only release DMA channel if successfully requested

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In omap_sham_probe() and omap_sham_remove(), 'dd->dma_lch'
is released without checking to see if it was successfully
requested or not.  This is a bug and was identified and
reported by Dan Carpenter here:

	http://www.spinics.net/lists/devicetree/msg11023.html

Add code to only release 'dd->dma_lch' when its not NULL
(that is, when it was successfully requested).

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
CC: Joel Fernandes <joelf@ti.com>
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Mark A. Greer 2013-11-12 13:12:27 -07:00 committed by Herbert Xu
parent f4875e12f3
commit f13ab86a61
1 changed files with 5 additions and 2 deletions
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3
drivers/crypto/omap-sham.c
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@ -1970,6 +1970,7 @@ err_algs:
crypto_unregister_ahash(
&dd->pdata->algs_info[i].algs_list[j]);
pm_runtime_disable(dev);
if (dd->dma_lch)
dma_release_channel(dd->dma_lch);
data_err:
dev_err(dev, "initialization failed.\n");
@ -1994,6 +1995,8 @@ static int omap_sham_remove(struct platform_device *pdev)
&dd->pdata->algs_info[i].algs_list[j]);
tasklet_kill(&dd->done_task);
pm_runtime_disable(&pdev->dev);
if (dd->dma_lch)
dma_release_channel(dd->dma_lch);
return 0;