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SubjectRe: [PATCH] staging: rtl8188eu: remove dead code in do-while conditional step
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On 9/23/19 2:48 PM, Connor Kuehl wrote:
> The local variable 'bcmd_down' is always set to true almost immediately
> before the do-while's condition is checked. As a result, !bcmd_down
> evaluates to false which short circuits the logical AND operator meaning
> that the second operand is never reached and is therefore dead code.
>
> Addresses-Coverity: ("Logically dead code")
>
> Signed-off-by: Connor Kuehl <connor.kuehl@canonical.com>
> ---
> drivers/staging/rtl8188eu/hal/rtl8188e_cmd.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/staging/rtl8188eu/hal/rtl8188e_cmd.c b/drivers/staging/rtl8188eu/hal/rtl8188e_cmd.c
> index 47352f210c0b..a4b317937b23 100644
> --- a/drivers/staging/rtl8188eu/hal/rtl8188e_cmd.c
> +++ b/drivers/staging/rtl8188eu/hal/rtl8188e_cmd.c
> @@ -48,7 +48,6 @@ static u8 _is_fw_read_cmd_down(struct adapter *adapt, u8 msgbox_num)
> static s32 FillH2CCmd_88E(struct adapter *adapt, u8 ElementID, u32 CmdLen, u8 *pCmdBuffer)
> {
> u8 bcmd_down = false;
> - s32 retry_cnts = 100;
> u8 h2c_box_num;
> u32 msgbox_addr;
> u32 msgbox_ex_addr;
> @@ -103,7 +102,7 @@ static s32 FillH2CCmd_88E(struct adapter *adapt, u8 ElementID, u32 CmdLen, u8 *p
> adapt->HalData->LastHMEBoxNum =
> (h2c_box_num+1) % RTL88E_MAX_H2C_BOX_NUMS;
>
> - } while ((!bcmd_down) && (retry_cnts--));
> + } while (!bcmd_down);
>
> ret = _SUCCESS;

This patch is correct; however, the do..while loop will always be executed once,
thus you could remove the loop and the loop variable bcmd_down.

@greg: If you would prefer a two-step process, then this one is OK.

Larry

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