dmaengine: at_hdmac: Use devm_kzalloc() and struct_size()

Use the resource-managed kzalloc to simplify error logic. Memory allocated
with this function is automatically freed on driver detach. Use
struct_size() helper to calculate the size of the atdma structure with its
trailing flexible array. While here, move the mem allocation higher in the
probe method, as failing to allocate memory indicates a serious system
issue, and everything else does not matter anyway. All these help the code
look a bit cleaner.
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20221025090306.297886-1-tudor.ambarus@microchip.com
Link: https://lore.kernel.org/r/20221025090306.297886-23-tudor.ambarus@microchip.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/at_hdmac.c

@@ -19,6 +19,7 @@
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/of.h>
+#include <linux/overflow.h>
 #include <linux/of_device.h>
 #include <linux/of_dma.h>
 
@@ -1786,6 +1787,12 @@ static int __init at_dma_probe(struct platform_device *pdev)
 	if (!plat_dat)
 		return -ENODEV;
 
+	atdma = devm_kzalloc(&pdev->dev,
+			     struct_size(atdma, chan, plat_dat->nr_channels),
+			     GFP_KERNEL);
+	if (!atdma)
+		return -ENOMEM;
+
 	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!io)
 		return -EINVAL;
@@ -1794,21 +1801,13 @@ static int __init at_dma_probe(struct platform_device *pdev)
 	if (irq < 0)
 		return irq;
 
-	size = sizeof(struct at_dma);
-	size += plat_dat->nr_channels * sizeof(struct at_dma_chan);
-	atdma = kzalloc(size, GFP_KERNEL);
-	if (!atdma)
-		return -ENOMEM;
-
 	/* discover transaction capabilities */
 	atdma->dma_common.cap_mask = plat_dat->cap_mask;
 	atdma->all_chan_mask = (1 << plat_dat->nr_channels) - 1;
 
 	size = resource_size(io);
-	if (!request_mem_region(io->start, size, pdev->dev.driver->name)) {
-		err = -EBUSY;
-		goto err_kfree;
-	}
+	if (!request_mem_region(io->start, size, pdev->dev.driver->name))
+		return -EBUSY;
 
 	atdma->regs = ioremap(io->start, size);
 	if (!atdma->regs) {
@@ -1963,8 +1962,6 @@ static int __init at_dma_probe(struct platform_device *pdev)
 	atdma->regs = NULL;
 err_release_r:
 	release_mem_region(io->start, size);
-err_kfree:
-	kfree(atdma);
 	return err;
 }
 
@@ -2003,8 +2000,6 @@ static int at_dma_remove(struct platform_device *pdev)
 	io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	release_mem_region(io->start, resource_size(io));
 
-	kfree(atdma);
-
 	return 0;
 }