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Subject[PATCH 09/13] crypto: omap-des - Support for deferred probing when requesting DMA channels
Date
Switch to use ma_request_slave_channel_compat_reason() to request the DMA
channels. Only fall back to pio mode if the error code returned is not
-EPROBE_DEFER, otherwise return from the probe with the -EPROBE_DEFER.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
CC: Herbert Xu <herbert@gondor.apana.org.au>
CC: David S. Miller <davem@davemloft.net>
CC: Lokesh Vutla <lokeshvutla@ti.com>
---
drivers/crypto/omap-des.c | 38 ++++++++++++++++++++------------------
1 file changed, 20 insertions(+), 18 deletions(-)

diff --git a/drivers/crypto/omap-des.c b/drivers/crypto/omap-des.c
index 46307098f8ba..06be02f520da 100644
--- a/drivers/crypto/omap-des.c
+++ b/drivers/crypto/omap-des.c
@@ -340,7 +340,7 @@ static void omap_des_dma_out_callback(void *data)

static int omap_des_dma_init(struct omap_des_dev *dd)
{
- int err = -ENOMEM;
+ int err;
dma_cap_mask_t mask;

dd->dma_lch_out = NULL;
@@ -349,21 +349,20 @@ static int omap_des_dma_init(struct omap_des_dev *dd)
dma_cap_zero(mask);
dma_cap_set(DMA_SLAVE, mask);

- dd->dma_lch_in = dma_request_slave_channel_compat(mask,
- omap_dma_filter_fn,
- &dd->dma_in,
- dd->dev, "rx");
- if (!dd->dma_lch_in) {
+ dd->dma_lch_in = dma_request_slave_channel_compat_reason(mask,
+ omap_dma_filter_fn, &dd->dma_in,
+ dd->dev, "rx");
+ if (IS_ERR(dd->dma_lch_in)) {
dev_err(dd->dev, "Unable to request in DMA channel\n");
- goto err_dma_in;
+ return PTR_ERR(dd->dma_lch_in);
}

- dd->dma_lch_out = dma_request_slave_channel_compat(mask,
- omap_dma_filter_fn,
- &dd->dma_out,
- dd->dev, "tx");
- if (!dd->dma_lch_out) {
+ dd->dma_lch_out = dma_request_slave_channel_compat_reason(mask,
+ omap_dma_filter_fn, &dd->dma_out,
+ dd->dev, "tx");
+ if (IS_ERR(dd->dma_lch_out)) {
dev_err(dd->dev, "Unable to request out DMA channel\n");
+ err = PTR_ERR(dd->dma_lch_out);
goto err_dma_out;
}

@@ -371,14 +370,15 @@ static int omap_des_dma_init(struct omap_des_dev *dd)

err_dma_out:
dma_release_channel(dd->dma_lch_in);
-err_dma_in:
- if (err)
- pr_err("error: %d\n", err);
+
return err;
}

static void omap_des_dma_cleanup(struct omap_des_dev *dd)
{
+ if (dd->pio_only)
+ return;
+
dma_release_channel(dd->dma_lch_out);
dma_release_channel(dd->dma_lch_in);
}
@@ -1110,7 +1110,9 @@ static int omap_des_probe(struct platform_device *pdev)
tasklet_init(&dd->queue_task, omap_des_queue_task, (unsigned long)dd);

err = omap_des_dma_init(dd);
- if (err && DES_REG_IRQ_STATUS(dd) && DES_REG_IRQ_ENABLE(dd)) {
+ if (err == -EPROBE_DEFER) {
+ goto err_irq;
+ } else if (err && DES_REG_IRQ_STATUS(dd) && DES_REG_IRQ_ENABLE(dd)) {
dd->pio_only = 1;

irq = platform_get_irq(pdev, 0);
@@ -1154,8 +1156,8 @@ err_algs:
for (j = dd->pdata->algs_info[i].registered - 1; j >= 0; j--)
crypto_unregister_alg(
&dd->pdata->algs_info[i].algs_list[j]);
- if (!dd->pio_only)
- omap_des_dma_cleanup(dd);
+
+ omap_des_dma_cleanup(dd);
err_irq:
tasklet_kill(&dd->done_task);
tasklet_kill(&dd->queue_task);
--
2.3.5


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