On Fri, Feb 15, 2013 at 02:26:27PM -0500, John W. Linville wrote:
> I still get the warning when building wireless-next on my F17 box
> with this patch applied...
I have no warning of F17 with:
gcc-4.7.2-2.fc17.x86_64
perhaps you use i686 or kernel config is different.
This warning must be a false positive. The code looks like below:
secondlen = skb->len - hdr_len;
if (secondlen > 0) {
phys_addr =
pci_map_single(il->pci_dev, skb->data + hdr_len, secondlen,
PCI_DMA_TODEVICE);
if (unlikely(pci_dma_mapping_error(il->pci_dev, phys_addr)))
goto drop_unlock;
}
/* */
if (secondlen > 0)
il->ops->txq_attach_buf_to_tfd(il, txq, phys_addr, secondlen,
0, 0);
and there are no other places where phys_addr is used.
I just realized that secondlen is u16, so there is no difference between
"if (secondlen)" and "if (secondlen > 0)". So this patch can be dropped.
Stanislaw
> On Fri, Feb 15, 2013 at 10:52:21AM +0100, Stanislaw Gruszka wrote:
> > This should fix:
> >
> > drivers/net/wireless/iwlegacy/4965-mac.c:1847:33: warning: 'phys_addr' may be used uninitialized in this function [-Wmaybe-uninitialized]
> >
> > Reported-by: Fengguang Wu <fengguang.wu@xxxxxxxxx>
> > Signed-off-by: Stanislaw Gruszka <sgruszka@xxxxxxxxxx>
> > ---
> > drivers/net/wireless/iwlegacy/4965-mac.c | 2 +-
> > 1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/wireless/iwlegacy/4965-mac.c b/drivers/net/wireless/iwlegacy/4965-mac.c
> > index 7941eb3..d2ab1cf 100644
> > --- a/drivers/net/wireless/iwlegacy/4965-mac.c
> > +++ b/drivers/net/wireless/iwlegacy/4965-mac.c
> > @@ -1843,7 +1843,7 @@ il4965_tx_skb(struct il_priv *il,
> > il->ops->txq_attach_buf_to_tfd(il, txq, txcmd_phys, firstlen, 1, 0);
> > dma_unmap_addr_set(out_meta, mapping, txcmd_phys);
> > dma_unmap_len_set(out_meta, len, firstlen);
> > - if (secondlen)
> > + if (secondlen > 0)
> > il->ops->txq_attach_buf_to_tfd(il, txq, phys_addr, secondlen,
> > 0, 0);
> >
> > --
> > 1.7.11.7
> >
> >
>
> --
> John W. Linville Someday the world will need a hero, and you
> linville@xxxxxxxxxxxxx might be all we have. Be ready.
--
To unsubscribe from this list: send the line "unsubscribe linux-wireless" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
