diff mbox series

brcmsmac: fix shift on 4 bit masked value

Message ID 20210318164513.19600-1-colin.king@canonical.com
State New
Headers show
Series brcmsmac: fix shift on 4 bit masked value | expand

Commit Message

Colin King March 18, 2021, 4:45 p.m. UTC
From: Colin Ian King <colin.king@canonical.com>

The calculation of offtune_val seems incorrect, the u16 value in
pi->tx_rx_cal_radio_saveregs[2] is being masked with 0xf0 and then
shifted 8 places right so that always ends up as a zero result. I
believe the intended shift was 4 bits to the right. Fix this.

[Note: not tested, I don't have the H/W]

Addresses-Coverity: ("Operands don't affect result")
Fixes: 5b435de0d786 ("net: wireless: add brcm80211 drivers")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Kalle Valo April 7, 2021, 11:37 a.m. UTC | #1
Colin King <colin.king@canonical.com> writes:

> From: Colin Ian King <colin.king@canonical.com>

>

> The calculation of offtune_val seems incorrect, the u16 value in

> pi->tx_rx_cal_radio_saveregs[2] is being masked with 0xf0 and then

> shifted 8 places right so that always ends up as a zero result. I

> believe the intended shift was 4 bits to the right. Fix this.

>

> [Note: not tested, I don't have the H/W]

>

> Addresses-Coverity: ("Operands don't affect result")

> Fixes: 5b435de0d786 ("net: wireless: add brcm80211 drivers")

> Signed-off-by: Colin Ian King <colin.king@canonical.com>


Can someone ack this?

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
Kalle Valo April 18, 2021, 6:10 a.m. UTC | #2
Colin King <colin.king@canonical.com> wrote:

> From: Colin Ian King <colin.king@canonical.com>
> 
> The calculation of offtune_val seems incorrect, the u16 value in
> pi->tx_rx_cal_radio_saveregs[2] is being masked with 0xf0 and then
> shifted 8 places right so that always ends up as a zero result. I
> believe the intended shift was 4 bits to the right. Fix this.
> 
> [Note: not tested, I don't have the H/W]
> 
> Addresses-Coverity: ("Operands don't affect result")
> Fixes: 5b435de0d786 ("net: wireless: add brcm80211 drivers")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>

I think this needs review from someone familiar with the hardware.

Patch set to Changes Requested.
Joe Perches April 18, 2021, 7:58 a.m. UTC | #3
On Sun, 2021-04-18 at 06:10 +0000, Kalle Valo wrote:
> Colin King <colin.king@canonical.com> wrote:

> 

> > From: Colin Ian King <colin.king@canonical.com>

> > 

> > The calculation of offtune_val seems incorrect, the u16 value in

> > pi->tx_rx_cal_radio_saveregs[2] is being masked with 0xf0 and then

> > shifted 8 places right so that always ends up as a zero result. I

> > believe the intended shift was 4 bits to the right. Fix this.

> > 

> > [Note: not tested, I don't have the H/W]

> > 

> > Addresses-Coverity: ("Operands don't affect result")

> > Fixes: 5b435de0d786 ("net: wireless: add brcm80211 drivers")

> > Signed-off-by: Colin Ian King <colin.king@canonical.com>

> 

> I think this needs review from someone familiar with the hardware.

> 

> Patch set to Changes Requested.


What "change" are you requesting here?

Likely there needs to be some other setting for the patch.

Perhaps "deferred" as you seem to be requesting a review
and there's no actual change necessary, just approval from
someone with the hardware and that someone test the patch.
Kalle Valo April 21, 2021, 9:07 a.m. UTC | #4
Joe Perches <joe@perches.com> writes:

> On Sun, 2021-04-18 at 06:10 +0000, Kalle Valo wrote:

>> Colin King <colin.king@canonical.com> wrote:

>> 

>> > From: Colin Ian King <colin.king@canonical.com>

>> > 

>> > The calculation of offtune_val seems incorrect, the u16 value in

>> > pi->tx_rx_cal_radio_saveregs[2] is being masked with 0xf0 and then

>> > shifted 8 places right so that always ends up as a zero result. I

>> > believe the intended shift was 4 bits to the right. Fix this.

>> > 

>> > [Note: not tested, I don't have the H/W]

>> > 

>> > Addresses-Coverity: ("Operands don't affect result")

>> > Fixes: 5b435de0d786 ("net: wireless: add brcm80211 drivers")

>> > Signed-off-by: Colin Ian King <colin.king@canonical.com>

>> 

>> I think this needs review from someone familiar with the hardware.

>> 

>> Patch set to Changes Requested.

>

> What "change" are you requesting here?


Don't take patchwork states literally, a better name for this state
would be "Needs work" or something like that.

> Likely there needs to be some other setting for the patch.

>

> Perhaps "deferred" as you seem to be requesting a review

> and there's no actual change necessary, just approval from

> someone with the hardware and that someone test the patch.


I already asked for help on April 7th and nobody replied, so I'm
dropping this now. The patch can be resent if/when the change is
confirmed to be correct.

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
diff mbox series

Patch

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c
index 8580a2754789..2c04bae6e21c 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c
@@ -26329,7 +26329,7 @@  static void wlc_phy_rxcal_radio_setup_nphy(struct brcms_phy *pi, u8 rx_core)
 
 					offtune_val =
 						(pi->tx_rx_cal_radio_saveregs
-						 [2] & 0xF0) >> 8;
+						 [2] & 0xF0) >> 4;
 					offtune_val =
 						(offtune_val <= 0x7) ? 0xF : 0;