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authorGustavo A. R. Silva <gustavo@embeddedor.com>2019-04-03 15:50:43 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-04-16 13:44:30 +0200
commite291fa1237a74dc4692995a4a598d4818a747191 (patch)
treed6a33a3c506686347065ba134e6bc659d2161b23 /drivers/staging/ralink-gdma/ralink-gdma.c
parent3b706841c29f1cf2f8f3484713288aa2c375677b (diff)
staging: ralink-gdma: 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; struct boo entry[]; }; size = sizeof(struct foo) + count * sizeof(struct boo); instance = kzalloc(size, GFP_KERNEL) Instead of leaving these open-coded and prone to type mistakes, we can now use the new struct_size() helper: size = struct_size(instance, entry, count); or instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL) Based on the above, replace gdma_dma_alloc_desc() with kzalloc() and use the new struct_size() helper. This code was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging/ralink-gdma/ralink-gdma.c')
-rw-r--r--drivers/staging/ralink-gdma/ralink-gdma.c12
1 files changed, 3 insertions, 9 deletions
diff --git a/drivers/staging/ralink-gdma/ralink-gdma.c b/drivers/staging/ralink-gdma/ralink-gdma.c
index d12ecdc01e61..de3e357b2640 100644
--- a/drivers/staging/ralink-gdma/ralink-gdma.c
+++ b/drivers/staging/ralink-gdma/ralink-gdma.c
@@ -164,12 +164,6 @@ static inline void gdma_dma_write(struct gdma_dma_dev *dma_dev,
writel(val, dma_dev->base + reg);
}
-static struct gdma_dma_desc *gdma_dma_alloc_desc(unsigned int num_sgs)
-{
- return kzalloc(sizeof(struct gdma_dma_desc) +
- sizeof(struct gdma_dma_sg) * num_sgs, GFP_ATOMIC);
-}
-
static enum gdma_dma_transfer_size gdma_dma_maxburst(u32 maxburst)
{
if (maxburst < 2)
@@ -526,7 +520,7 @@ static struct dma_async_tx_descriptor *gdma_dma_prep_slave_sg(
struct scatterlist *sg;
unsigned int i;
- desc = gdma_dma_alloc_desc(sg_len);
+ desc = kzalloc(struct_size(desc, sg, sg_len), GFP_ATOMIC);
if (!desc) {
dev_err(c->device->dev, "alloc sg decs error\n");
return NULL;
@@ -581,7 +575,7 @@ static struct dma_async_tx_descriptor *gdma_dma_prep_dma_memcpy(
xfer_count = GDMA_REG_CTRL0_TX_MASK;
num_periods = DIV_ROUND_UP(len, xfer_count);
- desc = gdma_dma_alloc_desc(num_periods);
+ desc = kzalloc(struct_size(desc, sg, num_periods), GFP_ATOMIC);
if (!desc) {
dev_err(c->device->dev, "alloc memcpy decs error\n");
return NULL;
@@ -626,7 +620,7 @@ static struct dma_async_tx_descriptor *gdma_dma_prep_dma_cyclic(
}
num_periods = buf_len / period_len;
- desc = gdma_dma_alloc_desc(num_periods);
+ desc = kzalloc(struct_size(desc, sg, num_periods), GFP_ATOMIC);
if (!desc) {
dev_err(c->device->dev, "alloc cyclic decs error\n");
return NULL;