[PATCH] IB/qib: Use kcalloc instead of kzalloc to allocate array

[PATCH] IB/qib: Use kcalloc instead of kzalloc to allocate array

[Thomas Meyer]

The advantage of kcalloc is, that will prevent integer overflows which could
result from the multiplication of number of elements and size and it is also
a bit nicer to read.

The semantic patch that makes this change is available
in https://lkml.org/lkml/2011/11/25/107

Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
---

diff -u -p a/drivers/infiniband/hw/qib/qib_init.c b/drivers/infiniband/hw/qib/qib_init.c
--- a/drivers/infiniband/hw/qib/qib_init.c 2011-11-13 11:07:26.730159415 +0100
+++ b/drivers/infiniband/hw/qib/qib_init.c 2011-11-28 19:51:23.644920442 +0100
@@ -116,7 +116,7 @@ int qib_create_ctxts(struct qib_devdata
 	 * Allocate full ctxtcnt array, rather than just cfgctxts, because
 	 * cleanup iterates across all possible ctxts.
 	 */
-	dd->rcd = kzalloc(sizeof(*dd->rcd) * dd->ctxtcnt, GFP_KERNEL);
+	dd->rcd = kcalloc(dd->ctxtcnt, sizeof(*dd->rcd), GFP_KERNEL);
 	if (!dd->rcd) {
 		qib_dev_err(dd, "Unable to allocate ctxtdata array, "
 			    "failing\n");
@@ -1435,9 +1435,8 @@ int qib_setup_eagerbufs(struct qib_ctxtd
 	egrperchunk = rcd->rcvegrbufs_perchunk;
 	size = rcd->rcvegrbuf_size;
 	if (!rcd->rcvegrbuf) {
-		rcd->rcvegrbuf =
-			kzalloc(chunk * sizeof(rcd->rcvegrbuf[0]),
-				GFP_KERNEL);
+		rcd->rcvegrbuf = kcalloc(chunk, sizeof(rcd->rcvegrbuf[0]),
+					 GFP_KERNEL);
 		if (!rcd->rcvegrbuf)
 			goto bail;
 	}

RE: [PATCH] IB/qib: Use kcalloc instead of kzalloc to allocate array

[Mike Marciniszyn]

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> Subject: [PATCH] IB/qib: Use kcalloc instead of kzalloc to allocate
> array
>
> The advantage of kcalloc is, that will prevent integer overflows which
> could
> result from the multiplication of number of elements and size and it is
> also
> a bit nicer to read.
>
> The semantic patch that makes this change is available
> in https://lkml.org/lkml/2011/11/25/107
>
> Signed-off-by: Thomas Meyer <thomas@m3y3r.de>

Thanks for the patch!

Acked-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>

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