[PATCH 17/37] drivers/pci/hotplug: Use kmemdup

From: Julia Lawall
Date: Sat May 15 2010 - 17:18:27 EST


From: Julia Lawall <julia@xxxxxxx>

Use kmemdup when some other buffer is immediately copied into the
allocated region.

A simplified version of the semantic patch that makes this change is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression from,to,size,flag;
statement S;
@@

- to = \(kmalloc\|kzalloc\)(size,flag);
+ to = kmemdup(from,size,flag);
if (to==NULL || ...) S
- memcpy(to, from, size);
// </smpl>

Signed-off-by: Julia Lawall <julia@xxxxxxx>

---
drivers/pci/hotplug/cpqphp_core.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff -u -p a/drivers/pci/hotplug/cpqphp_core.c b/drivers/pci/hotplug/cpqphp_core.c
--- a/drivers/pci/hotplug/cpqphp_core.c
+++ b/drivers/pci/hotplug/cpqphp_core.c
@@ -1075,13 +1075,12 @@ static int cpqhpc_probe(struct pci_dev *

/* make our own copy of the pci bus structure,
* as we like tweaking it a lot */
- ctrl->pci_bus = kmalloc(sizeof(*ctrl->pci_bus), GFP_KERNEL);
+ ctrl->pci_bus = kmemdup(pdev->bus, sizeof(*ctrl->pci_bus), GFP_KERNEL);
if (!ctrl->pci_bus) {
err("out of memory\n");
rc = -ENOMEM;
goto err_free_ctrl;
}
- memcpy(ctrl->pci_bus, pdev->bus, sizeof(*ctrl->pci_bus));

ctrl->bus = pdev->bus->number;
ctrl->rev = pdev->revision;
--
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