From: Gustavo A. R. Silva Date: Wed, 9 Jan 2019 14:44:37 +0000 (-0600) Subject: dmaengine: axi-dmac: Use struct_size() in kzalloc() X-Git-Tag: v5.1-rc1~32^2~25 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=48b02a85fe2e6a0927acaa754ba3bef4a20a5e37;p=linux.git dmaengine: axi-dmac: Use struct_size() in kzalloc() One of the more common cases of allocation size calculations is finding the size of a structure that has a zero-sized array at the end, along with memory for some number of elements for that array. For example: struct foo { int stuff; void *entry[]; }; instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL); Instead of leaving these open-coded and prone to type mistakes, we can now use the new struct_size() helper: instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL); This code was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva Signed-off-by: Vinod Koul --- diff --git a/drivers/dma/dma-axi-dmac.c b/drivers/dma/dma-axi-dmac.c index 15b2453d2647..ffc0adc2f6ce 100644 --- a/drivers/dma/dma-axi-dmac.c +++ b/drivers/dma/dma-axi-dmac.c @@ -367,8 +367,7 @@ static struct axi_dmac_desc *axi_dmac_alloc_desc(unsigned int num_sgs) struct axi_dmac_desc *desc; unsigned int i; - desc = kzalloc(sizeof(struct axi_dmac_desc) + - sizeof(struct axi_dmac_sg) * num_sgs, GFP_NOWAIT); + desc = kzalloc(struct_size(desc, sg, num_sgs), GFP_NOWAIT); if (!desc) return NULL;