linux-kernel - Re: [PATCH] fsl/qe: ucc: copy and paste bug in ucc_get_tdm_sync

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Message-ID: <20180604134024.dmd7mn2wggqpmkcq@mwanda>
Date:   Mon, 4 Jun 2018 16:40:24 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Julia Lawall <julia.lawall@...6.fr>
Cc:     Qiang Zhao <qiang.zhao@....com>, Li Yang <leoyang.li@....com>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] fsl/qe: ucc: copy and paste bug in
 ucc_get_tdm_sync_shift()

On Mon, Jun 04, 2018 at 10:25:14PM +0900, Julia Lawall wrote:
> 
> 
> On Mon, 4 Jun 2018, Dan Carpenter wrote:
> 
> > There is a copy and paste bug so we accidentally use the RX_ shift when
> > we're in TX_ mode.
> >
> > Fixes: bb8b2062aff3 ("fsl/qe: setup clock source for TDM mode")
> > Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> > ---
> > Static analysis work.  Not tested.  This affects the success path, so
> > we should probably test it.
> 
> Maybe this is another one?  I don't have time to look into it at the
> moment...
> 
> drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c
> 
>  	/* For strict priority entries defines the number of consecutive
>  	 * slots for the highest priority.
>  	 */
> 	REG_WR(bp, (port) ? NIG_REG_P1_TX_ARB_NUM_STRICT_ARB_SLOTS :
> 		   NIG_REG_P1_TX_ARB_NUM_STRICT_ARB_SLOTS, 0x100);
>  	/* Mapping between the CREDIT_WEIGHT registers and actual client
>  	 * numbers
>  	 */
> 
> I find some others that choose between constants, such as ... ? 0 : 0.

I feel like it should warn about all of those because people shouldn't
be submitting unfinished written code to the kernel.  Coccinelle is a
lot better for this than Smatch is because it's pre-processor stuff.

regards,
dan carpenter