drivers/media/video/uvc: Use kmemdup
in [Kernel]
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From: Laurent Pinchart on 19 May 2010 18:10 Hi Julia, Thanks for the patch. On Saturday 15 May 2010 23:17:59 Julia Lawall wrote: > From: Julia Lawall <julia(a)diku.dk> > > 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(a)diku.dk> > > --- > drivers/media/video/uvc/uvc_driver.c | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) > > diff -u -p a/drivers/media/video/uvc/uvc_driver.c > b/drivers/media/video/uvc/uvc_driver.c --- > a/drivers/media/video/uvc/uvc_driver.c > +++ b/drivers/media/video/uvc/uvc_driver.c > @@ -637,14 +637,13 @@ static int uvc_parse_streaming(struct uv > } > streaming->header.bControlSize = n; > > - streaming->header.bmaControls = kmalloc(p*n, GFP_KERNEL); > + streaming->header.bmaControls = kmemdup(&buffer[size], p * n, I'm puzzled, how did the above semantic patch transform 'p*n' into 'p * n' ? As a side note, keeping 'p*n' would have allowed the statement to fit in one line :-) > + GFP_KERNEL); > if (streaming->header.bmaControls == NULL) { > ret = -ENOMEM; > goto error; > } > > - memcpy(streaming->header.bmaControls, &buffer[size], p*n); > - > buflen -= buffer[0]; > buffer += buffer[0]; -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |