[PATCH] fsl/qe: ucc: copy and paste bug in ucc_get_tdm_sync_shift()

[PATCH] fsl/qe: ucc: copy and paste bug in ucc_get_tdm_sync_shift()

[Dan Carpenter]

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@oracle.com>
---
Static analysis work.  Not tested.  This affects the success path, so
we should probably test it.

diff --git a/drivers/soc/fsl/qe/ucc.c b/drivers/soc/fsl/qe/ucc.c
index c646d8713861..681f7d4b7724 100644
--- a/drivers/soc/fsl/qe/ucc.c
+++ b/drivers/soc/fsl/qe/ucc.c
@@ -626,7 +626,7 @@ static u32 ucc_get_tdm_sync_shift(enum comm_dir mode, u32 tdm_num)
 {
 	u32 shift;
 
-	shift = (mode == COMM_DIR_RX) ? RX_SYNC_SHIFT_BASE : RX_SYNC_SHIFT_BASE;
+	shift = (mode == COMM_DIR_RX) ? RX_SYNC_SHIFT_BASE : TX_SYNC_SHIFT_BASE;
 	shift -= tdm_num * 2;
 
 	return shift;

Re: [PATCH] fsl/qe: ucc: copy and paste bug in ucc_get_tdm_sync_shift()

[Mathieu Malaterre]

Where did the original go ?

https://patchwork.ozlabs.org/patch/868158/


On Mon, Jun 4, 2018 at 2:02 PM Dan Carpenter <dan.carpenter@oracle.com> 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@oracle.com>
> ---
> Static analysis work.  Not tested.  This affects the success path, so
> we should probably test it.
>
> diff --git a/drivers/soc/fsl/qe/ucc.c b/drivers/soc/fsl/qe/ucc.c
> index c646d8713861..681f7d4b7724 100644
> --- a/drivers/soc/fsl/qe/ucc.c
> +++ b/drivers/soc/fsl/qe/ucc.c
> @@ -626,7 +626,7 @@ static u32 ucc_get_tdm_sync_shift(enum comm_dir mode, u32 tdm_num)
>  {
>         u32 shift;
>
> -       shift = (mode == COMM_DIR_RX) ? RX_SYNC_SHIFT_BASE : RX_SYNC_SHIFT_BASE;
> +       shift = (mode == COMM_DIR_RX) ? RX_SYNC_SHIFT_BASE : TX_SYNC_SHIFT_BASE;
>         shift -= tdm_num * 2;
>
>         return shift;

Re: [PATCH] fsl/qe: ucc: copy and paste bug in ucc_get_tdm_sync_shift()

[Dan Carpenter]

On Mon, Jun 04, 2018 at 02:06:45PM +0200, Mathieu Malaterre wrote:
> Where did the original go ?
> 
> https://patchwork.ozlabs.org/patch/868158/
> 
> 

Btw, we still haven't pushed a patch for this bug.

regards,
dan carpenter

Re: [PATCH] fsl/qe: ucc: copy and paste bug in ucc_get_tdm_sync_shift()

[Li Yang]

On Wed, Aug 29, 2018 at 4:42 AM Dan Carpenter <dan.carpenter@oracle.com> wrote:
>
> On Mon, Jun 04, 2018 at 02:06:45PM +0200, Mathieu Malaterre wrote:
> > Where did the original go ?
> >
> > https://patchwork.ozlabs.org/patch/868158/
> >
> >
>
> Btw, we still haven't pushed a patch for this bug.

I will combine Zhao Qiang's patch with your description which is
better, and push as fix for 4.19.

Regards,
Leo

Re: [PATCH] fsl/qe: ucc: copy and paste bug in ucc_get_tdm_sync_shift()

[Julia Lawall]

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@oracle.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.

julia


>
> diff --git a/drivers/soc/fsl/qe/ucc.c b/drivers/soc/fsl/qe/ucc.c
> index c646d8713861..681f7d4b7724 100644
> --- a/drivers/soc/fsl/qe/ucc.c
> +++ b/drivers/soc/fsl/qe/ucc.c
> @@ -626,7 +626,7 @@ static u32 ucc_get_tdm_sync_shift(enum comm_dir mode, u32 tdm_num)
>  {
>  	u32 shift;
>
> -	shift = (mode == COMM_DIR_RX) ? RX_SYNC_SHIFT_BASE : RX_SYNC_SHIFT_BASE;
> +	shift = (mode == COMM_DIR_RX) ? RX_SYNC_SHIFT_BASE : TX_SYNC_SHIFT_BASE;
>  	shift -= tdm_num * 2;
>
>  	return shift;
> --
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Re: [PATCH] fsl/qe: ucc: copy and paste bug in ucc_get_tdm_sync_shift()

[Dan Carpenter]

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@oracle.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

Re: [PATCH] fsl/qe: ucc: copy and paste bug in ucc_get_tdm_sync_shift()

[Julia Lawall]

On Mon, 4 Jun 2018, Dan Carpenter wrote:

> 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@oracle.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.

OK, maybe I can report these in the next few days.

thanks,
julia