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Date: Sat, 30 Aug 2014 13:32:16 -0700 From: Greg KH <gregkh@...uxfoundation.org> To: Mark Einon <mark.einon@...il.com> Cc: devel@...verdev.osuosl.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 3/8] staging: et131x: Use for loop to initialise contiguous registers to zero On Wed, Aug 20, 2014 at 11:17:53PM +0100, Mark Einon wrote: > Replace a long list of contiguous writel() calls with a for loop iterating > over the same values. > > Signed-off-by: Mark Einon <mark.einon@...il.com> > --- > drivers/staging/et131x/et131x.c | 27 +++------------------------ > 1 file changed, 3 insertions(+), 24 deletions(-) > > diff --git a/drivers/staging/et131x/et131x.c b/drivers/staging/et131x/et131x.c > index fffe763..44cc684 100644 > --- a/drivers/staging/et131x/et131x.c > +++ b/drivers/staging/et131x/et131x.c > @@ -1138,6 +1138,7 @@ static void et1310_config_rxmac_regs(struct et131x_adapter *adapter) > u32 sa_lo; > u32 sa_hi = 0; > u32 pf_ctrl = 0; > + u32 *wolw; > > /* Disable the MAC while it is being configured (also disable WOL) */ > writel(0x8, &rxmac->ctrl); > @@ -1151,30 +1152,8 @@ static void et1310_config_rxmac_regs(struct et131x_adapter *adapter) > * its default Values of 0x00000000 because there are not WOL masks > * as of this time. > */ > - writel(0, &rxmac->mask0_word0); > - writel(0, &rxmac->mask0_word1); > - writel(0, &rxmac->mask0_word2); > - writel(0, &rxmac->mask0_word3); > - > - writel(0, &rxmac->mask1_word0); > - writel(0, &rxmac->mask1_word1); > - writel(0, &rxmac->mask1_word2); > - writel(0, &rxmac->mask1_word3); > - > - writel(0, &rxmac->mask2_word0); > - writel(0, &rxmac->mask2_word1); > - writel(0, &rxmac->mask2_word2); > - writel(0, &rxmac->mask2_word3); > - > - writel(0, &rxmac->mask3_word0); > - writel(0, &rxmac->mask3_word1); > - writel(0, &rxmac->mask3_word2); > - writel(0, &rxmac->mask3_word3); > - > - writel(0, &rxmac->mask4_word0); > - writel(0, &rxmac->mask4_word1); > - writel(0, &rxmac->mask4_word2); > - writel(0, &rxmac->mask4_word3); > + for (wolw = &rxmac->mask0_word0; wolw <= &rxmac->mask4_word3; wolw++) > + writel(0, wolw); You are now only writing to all locations 1 time, instead of 4 times, like before, are you sure that is ok? Hardware is flaky, sometimes it wants to be written to multiple times... greg k-h -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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