[PATCH 26/33] dmaengine: at_hdmac: Use devm_kzalloc() and struct_size()
From: Tudor Ambarus <hidden>
Date: 2022-08-20 13:00:37
Also in:
dmaengine, lkml
Subsystem:
dma generic offload engine subsystem, microchip at91 dma drivers, the rest · Maintainers:
Vinod Koul, Ludovic Desroches, Linus Torvalds
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 <redacted> --- drivers/dma/at_hdmac.c | 23 +++++++++-------------- 1 file changed, 9 insertions(+), 14 deletions(-)
diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c
index f2c645e60619..85808cfda3cc 100644
--- a/drivers/dma/at_hdmac.c
+++ b/drivers/dma/at_hdmac.c@@ -20,6 +20,7 @@ #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>
@@ -2229,6 +2230,12 @@ 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;
@@ -2237,21 +2244,13 @@ 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_device.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) {
@@ -2401,8 +2400,6 @@ 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; }
@@ -2441,8 +2438,6 @@ 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; }
--
2.25.1
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