Extra rtl_get_bbreg looks like redundant reading. The read has
already been done in the "else" branch. Compile test only.
Found by Linux Verification Center (linuxtesting.org) with SVACE.
Signed-off-by: Peter Kosyh <[email protected]>
---
If this code is important for the operation of the hardware, then it would
be nice to comment on it.
drivers/net/wireless/realtek/rtlwifi/rtl8192se/phy.c | 3 ---
1 file changed, 3 deletions(-)
diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192se/phy.c b/drivers/net/wireless/realtek/rtlwifi/rtl8192se/phy.c
index aaa004d4d6d0..09591a0b5a81 100644
--- a/drivers/net/wireless/realtek/rtlwifi/rtl8192se/phy.c
+++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192se/phy.c
@@ -115,9 +115,6 @@ static u32 _rtl92s_phy_rf_serial_read(struct ieee80211_hw *hw,
retvalue = rtl_get_bbreg(hw, pphyreg->rf_rb,
BLSSI_READBACK_DATA);
- retvalue = rtl_get_bbreg(hw, pphyreg->rf_rb,
- BLSSI_READBACK_DATA);
-
rtl_dbg(rtlpriv, COMP_RF, DBG_TRACE, "RFR-%d Addr[0x%x]=0x%x\n",
rfpath, pphyreg->rf_rb, retvalue);
--
2.38.1
> -----Original Message-----
> From: Peter Kosyh <[email protected]>
> Sent: Monday, December 5, 2022 4:54 PM
> To: Ping-Ke Shih <[email protected]>
> Cc: Peter Kosyh <[email protected]>; David S. Miller <[email protected]>; Eric Dumazet
> <[email protected]>; Kalle Valo <[email protected]>; Jakub Kicinski <[email protected]>; Paolo Abeni
> <[email protected]>; [email protected]; [email protected];
> [email protected]; [email protected]
> Subject: [PATCH] rtlwifi: rtl8192se: remove redundant rtl_get_bbreg call
>
> Extra rtl_get_bbreg looks like redundant reading. The read has
> already been done in the "else" branch. Compile test only.
Originally, the code is
01 if (rfpi_enable)
02 val = get_from_interface_A();
03 else
04 val = get_from_interface_B();
05
06 val = get_from_interface_B();
This patch is to remove line 06, and it looks like logic is changed. However,
'rfpi_enable' is decided by 0x820[8] and 0x828[8] set by rtl8192sephy_reg_2t2rarray[]
table, and 'rfpi_enable' is always false. I think this is why nobody can't
encounter problem and find this bug.
>
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>
> Signed-off-by: Peter Kosyh <[email protected]>
Acked-by: Ping-Ke Shih <[email protected]>
> ---
> If this code is important for the operation of the hardware, then it would
> be nice to comment on it.
>
> drivers/net/wireless/realtek/rtlwifi/rtl8192se/phy.c | 3 ---
> 1 file changed, 3 deletions(-)
>
> diff --git a/drivers/net/wireless/realtek/rtlwifi/rtl8192se/phy.c
> b/drivers/net/wireless/realtek/rtlwifi/rtl8192se/phy.c
> index aaa004d4d6d0..09591a0b5a81 100644
> --- a/drivers/net/wireless/realtek/rtlwifi/rtl8192se/phy.c
> +++ b/drivers/net/wireless/realtek/rtlwifi/rtl8192se/phy.c
> @@ -115,9 +115,6 @@ static u32 _rtl92s_phy_rf_serial_read(struct ieee80211_hw *hw,
> retvalue = rtl_get_bbreg(hw, pphyreg->rf_rb,
> BLSSI_READBACK_DATA);
>
> - retvalue = rtl_get_bbreg(hw, pphyreg->rf_rb,
> - BLSSI_READBACK_DATA);
> -
> rtl_dbg(rtlpriv, COMP_RF, DBG_TRACE, "RFR-%d Addr[0x%x]=0x%x\n",
> rfpath, pphyreg->rf_rb, retvalue);
>
> --
> 2.38.1
Peter Kosyh <[email protected]> wrote:
> Extra rtl_get_bbreg() call looks like redundant reading. The read has
> already been done in the "else" branch. Compile test only.
>
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
>
> Signed-off-by: Peter Kosyh <[email protected]>
> Acked-by: Ping-Ke Shih <[email protected]>
Patch applied to wireless-next.git, thanks.
49ebca0d9018 wifi: rtlwifi: rtl8192se: remove redundant rtl_get_bbreg() call
--
https://patchwork.kernel.org/project/linux-wireless/patch/[email protected]/
https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches