dmaengine: dw: fix regression in dw_probe() function
The commit dbde5c29 "dw_dmac: use devm_* functions to simplify code" turns
probe function to use devm_* helpers and simultaneously brings a regression.
We have to 1) call clk_disable_unprepare() on error path, and 2) check error
code of clk_enable_prepare(). First part was done in the original code, second
one is an update.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index 009dc62..d539019 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -1496,7 +1496,9 @@
dw->clk = devm_clk_get(chip->dev, "hclk");
if (IS_ERR(dw->clk))
return PTR_ERR(dw->clk);
- clk_prepare_enable(dw->clk);
+ err = clk_prepare_enable(dw->clk);
+ if (err)
+ return err;
dw_params = dma_read_byaddr(chip->regs, DW_PARAMS);
autocfg = dw_params >> DW_PARAMS_EN & 0x1;
@@ -1505,15 +1507,19 @@
if (!pdata && autocfg) {
pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL);
- if (!pdata)
- return -ENOMEM;
+ if (!pdata) {
+ err = -ENOMEM;
+ goto err_pdata;
+ }
/* Fill platform data with the default values */
pdata->is_private = true;
pdata->chan_allocation_order = CHAN_ALLOCATION_ASCENDING;
pdata->chan_priority = CHAN_PRIORITY_ASCENDING;
- } else if (!pdata || pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS)
- return -EINVAL;
+ } else if (!pdata || pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS) {
+ err = -EINVAL;
+ goto err_pdata;
+ }
if (autocfg)
nr_channels = (dw_params >> DW_PARAMS_NR_CHAN & 0x7) + 1;
@@ -1522,8 +1528,10 @@
dw->chan = devm_kcalloc(chip->dev, nr_channels, sizeof(*dw->chan),
GFP_KERNEL);
- if (!dw->chan)
- return -ENOMEM;
+ if (!dw->chan) {
+ err = -ENOMEM;
+ goto err_pdata;
+ }
/* Get hardware configuration parameters */
if (autocfg) {
@@ -1553,7 +1561,8 @@
sizeof(struct dw_desc), 4, 0);
if (!dw->desc_pool) {
dev_err(chip->dev, "No memory for descriptors dma pool\n");
- return -ENOMEM;
+ err = -ENOMEM;
+ goto err_pdata;
}
tasklet_init(&dw->tasklet, dw_dma_tasklet, (unsigned long)dw);
@@ -1561,7 +1570,7 @@
err = request_irq(chip->irq, dw_dma_interrupt, IRQF_SHARED,
"dw_dmac", dw);
if (err)
- return err;
+ goto err_pdata;
INIT_LIST_HEAD(&dw->dma.channels);
for (i = 0; i < nr_channels; i++) {
@@ -1656,6 +1665,10 @@
dma_async_device_register(&dw->dma);
return 0;
+
+err_pdata:
+ clk_disable_unprepare(dw->clk);
+ return err;
}
EXPORT_SYMBOL_GPL(dw_dma_probe);
@@ -1676,6 +1689,8 @@
channel_clear_bit(dw, CH_EN, dwc->mask);
}
+ clk_disable_unprepare(dw->clk);
+
return 0;
}
EXPORT_SYMBOL_GPL(dw_dma_remove);