[PATCH] media: i2c: adv748x: Fix unsafe macros

[PATCH] media: i2c: adv748x: Fix unsafe macros

[Gustavo A. R. Silva]

Enclose multiple macro parameters in parentheses in order to
make such macros safer and fix the Clang warning below:

drivers/media/i2c/adv748x/adv748x-afe.c:452:12: warning: operator '?:'
has lower precedence than '|'; '|' will be evaluated first
[-Wbitwise-conditional-parentheses]

ret = sdp_clrset(state, ADV748X_SDP_FRP, ADV748X_SDP_FRP_MASK, enable
? ctrl->val - 1 : 0);

Fixes: 3e89586a64df ("media: i2c: adv748x: add adv748x driver")
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
 drivers/media/i2c/adv748x/adv748x.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/media/i2c/adv748x/adv748x.h b/drivers/media/i2c/adv748x/adv748x.h
index 5042f9e94aee..fccb388ce179 100644
--- a/drivers/media/i2c/adv748x/adv748x.h
+++ b/drivers/media/i2c/adv748x/adv748x.h
@@ -394,10 +394,10 @@ int adv748x_write_block(struct adv748x_state *state, int client_page,
 
 #define io_read(s, r) adv748x_read(s, ADV748X_PAGE_IO, r)
 #define io_write(s, r, v) adv748x_write(s, ADV748X_PAGE_IO, r, v)
-#define io_clrset(s, r, m, v) io_write(s, r, (io_read(s, r) & ~m) | v)
+#define io_clrset(s, r, m, v) io_write(s, r, (io_read(s, r) & ~(m)) | (v))
 
 #define hdmi_read(s, r) adv748x_read(s, ADV748X_PAGE_HDMI, r)
-#define hdmi_read16(s, r, m) (((hdmi_read(s, r) << 8) | hdmi_read(s, r+1)) & m)
+#define hdmi_read16(s, r, m) (((hdmi_read(s, r) << 8) | hdmi_read(s, (r)+1)) & (m))
 #define hdmi_write(s, r, v) adv748x_write(s, ADV748X_PAGE_HDMI, r, v)
 
 #define repeater_read(s, r) adv748x_read(s, ADV748X_PAGE_REPEATER, r)
@@ -405,11 +405,11 @@ int adv748x_write_block(struct adv748x_state *state, int client_page,
 
 #define sdp_read(s, r) adv748x_read(s, ADV748X_PAGE_SDP, r)
 #define sdp_write(s, r, v) adv748x_write(s, ADV748X_PAGE_SDP, r, v)
-#define sdp_clrset(s, r, m, v) sdp_write(s, r, (sdp_read(s, r) & ~m) | v)
+#define sdp_clrset(s, r, m, v) sdp_write(s, r, (sdp_read(s, r) & ~(m)) | (v))
 
 #define cp_read(s, r) adv748x_read(s, ADV748X_PAGE_CP, r)
 #define cp_write(s, r, v) adv748x_write(s, ADV748X_PAGE_CP, r, v)
-#define cp_clrset(s, r, m, v) cp_write(s, r, (cp_read(s, r) & ~m) | v)
+#define cp_clrset(s, r, m, v) cp_write(s, r, (cp_read(s, r) & ~(m)) | (v))
 
 #define tx_read(t, r) adv748x_read(t->state, t->page, r)
 #define tx_write(t, r, v) adv748x_write(t->state, t->page, r, v)
-- 
2.23.0

Re: [PATCH] media: i2c: adv748x: Fix unsafe macros

[Kieran Bingham]

Hi Gustavo,

On 22/10/2019 14:25, Gustavo A. R. Silva wrote:
> Enclose multiple macro parameters in parentheses in order to
> make such macros safer and fix the Clang warning below:
> 
> drivers/media/i2c/adv748x/adv748x-afe.c:452:12: warning: operator '?:'
> has lower precedence than '|'; '|' will be evaluated first
> [-Wbitwise-conditional-parentheses]
> 
> ret = sdp_clrset(state, ADV748X_SDP_FRP, ADV748X_SDP_FRP_MASK, enable
> ? ctrl->val - 1 : 0);
> 
> Fixes: 3e89586a64df ("media: i2c: adv748x: add adv748x driver")
> Reported-by: Dmitry Vyukov <dvyukov@google.com>
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>

Thanks,

You beat me to posting - but that looks incredibly close (identical I
think) to the one I had prepared.

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>

> ---
>  drivers/media/i2c/adv748x/adv748x.h | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/i2c/adv748x/adv748x.h b/drivers/media/i2c/adv748x/adv748x.h
> index 5042f9e94aee..fccb388ce179 100644
> --- a/drivers/media/i2c/adv748x/adv748x.h
> +++ b/drivers/media/i2c/adv748x/adv748x.h
> @@ -394,10 +394,10 @@ int adv748x_write_block(struct adv748x_state *state, int client_page,
>  
>  #define io_read(s, r) adv748x_read(s, ADV748X_PAGE_IO, r)
>  #define io_write(s, r, v) adv748x_write(s, ADV748X_PAGE_IO, r, v)
> -#define io_clrset(s, r, m, v) io_write(s, r, (io_read(s, r) & ~m) | v)
> +#define io_clrset(s, r, m, v) io_write(s, r, (io_read(s, r) & ~(m)) | (v))
>  
>  #define hdmi_read(s, r) adv748x_read(s, ADV748X_PAGE_HDMI, r)
> -#define hdmi_read16(s, r, m) (((hdmi_read(s, r) << 8) | hdmi_read(s, r+1)) & m)
> +#define hdmi_read16(s, r, m) (((hdmi_read(s, r) << 8) | hdmi_read(s, (r)+1)) & (m))
>  #define hdmi_write(s, r, v) adv748x_write(s, ADV748X_PAGE_HDMI, r, v)
>  
>  #define repeater_read(s, r) adv748x_read(s, ADV748X_PAGE_REPEATER, r)
> @@ -405,11 +405,11 @@ int adv748x_write_block(struct adv748x_state *state, int client_page,
>  
>  #define sdp_read(s, r) adv748x_read(s, ADV748X_PAGE_SDP, r)
>  #define sdp_write(s, r, v) adv748x_write(s, ADV748X_PAGE_SDP, r, v)
> -#define sdp_clrset(s, r, m, v) sdp_write(s, r, (sdp_read(s, r) & ~m) | v)
> +#define sdp_clrset(s, r, m, v) sdp_write(s, r, (sdp_read(s, r) & ~(m)) | (v))
>  
>  #define cp_read(s, r) adv748x_read(s, ADV748X_PAGE_CP, r)
>  #define cp_write(s, r, v) adv748x_write(s, ADV748X_PAGE_CP, r, v)
> -#define cp_clrset(s, r, m, v) cp_write(s, r, (cp_read(s, r) & ~m) | v)
> +#define cp_clrset(s, r, m, v) cp_write(s, r, (cp_read(s, r) & ~(m)) | (v))
>  
>  #define tx_read(t, r) adv748x_read(t->state, t->page, r)
>  #define tx_write(t, r, v) adv748x_write(t->state, t->page, r, v)
> 

Re: [PATCH] media: i2c: adv748x: Fix unsafe macros

[Nathan Chancellor]

On Tue, Oct 22, 2019 at 08:25:22AM -0500, Gustavo A. R. Silva wrote:
> Enclose multiple macro parameters in parentheses in order to
> make such macros safer and fix the Clang warning below:
> 
> drivers/media/i2c/adv748x/adv748x-afe.c:452:12: warning: operator '?:'
> has lower precedence than '|'; '|' will be evaluated first
> [-Wbitwise-conditional-parentheses]
> 
> ret = sdp_clrset(state, ADV748X_SDP_FRP, ADV748X_SDP_FRP_MASK, enable
> ? ctrl->val - 1 : 0);
> 
> Fixes: 3e89586a64df ("media: i2c: adv748x: add adv748x driver")
> Reported-by: Dmitry Vyukov <dvyukov@google.com>
> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com

It doesn't look like this was picked up? I still see this warning on
5.5-rc6 and next-20200113.

If it helps:

Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>

> ---
>  drivers/media/i2c/adv748x/adv748x.h | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/i2c/adv748x/adv748x.h b/drivers/media/i2c/adv748x/adv748x.h
> index 5042f9e94aee..fccb388ce179 100644
> --- a/drivers/media/i2c/adv748x/adv748x.h
> +++ b/drivers/media/i2c/adv748x/adv748x.h
> @@ -394,10 +394,10 @@ int adv748x_write_block(struct adv748x_state *state, int client_page,
>  
>  #define io_read(s, r) adv748x_read(s, ADV748X_PAGE_IO, r)
>  #define io_write(s, r, v) adv748x_write(s, ADV748X_PAGE_IO, r, v)
> -#define io_clrset(s, r, m, v) io_write(s, r, (io_read(s, r) & ~m) | v)
> +#define io_clrset(s, r, m, v) io_write(s, r, (io_read(s, r) & ~(m)) | (v))
>  
>  #define hdmi_read(s, r) adv748x_read(s, ADV748X_PAGE_HDMI, r)
> -#define hdmi_read16(s, r, m) (((hdmi_read(s, r) << 8) | hdmi_read(s, r+1)) & m)
> +#define hdmi_read16(s, r, m) (((hdmi_read(s, r) << 8) | hdmi_read(s, (r)+1)) & (m))
>  #define hdmi_write(s, r, v) adv748x_write(s, ADV748X_PAGE_HDMI, r, v)
>  
>  #define repeater_read(s, r) adv748x_read(s, ADV748X_PAGE_REPEATER, r)
> @@ -405,11 +405,11 @@ int adv748x_write_block(struct adv748x_state *state, int client_page,
>  
>  #define sdp_read(s, r) adv748x_read(s, ADV748X_PAGE_SDP, r)
>  #define sdp_write(s, r, v) adv748x_write(s, ADV748X_PAGE_SDP, r, v)
> -#define sdp_clrset(s, r, m, v) sdp_write(s, r, (sdp_read(s, r) & ~m) | v)
> +#define sdp_clrset(s, r, m, v) sdp_write(s, r, (sdp_read(s, r) & ~(m)) | (v))
>  
>  #define cp_read(s, r) adv748x_read(s, ADV748X_PAGE_CP, r)
>  #define cp_write(s, r, v) adv748x_write(s, ADV748X_PAGE_CP, r, v)
> -#define cp_clrset(s, r, m, v) cp_write(s, r, (cp_read(s, r) & ~m) | v)
> +#define cp_clrset(s, r, m, v) cp_write(s, r, (cp_read(s, r) & ~(m)) | (v))
>  
>  #define tx_read(t, r) adv748x_read(t->state, t->page, r)
>  #define tx_write(t, r, v) adv748x_write(t->state, t->page, r, v)
> -- 
> 2.23.0
> 

Re: [PATCH] media: i2c: adv748x: Fix unsafe macros

[Gustavo A. R. Silva]

Hi!

Quoting Nathan Chancellor <natechancellor@gmail.com>:

> On Tue, Oct 22, 2019 at 08:25:22AM -0500, Gustavo A. R. Silva wrote:
>> Enclose multiple macro parameters in parentheses in order to
>> make such macros safer and fix the Clang warning below:
>>
>> drivers/media/i2c/adv748x/adv748x-afe.c:452:12: warning: operator '?:'
>> has lower precedence than '|'; '|' will be evaluated first
>> [-Wbitwise-conditional-parentheses]
>>
>> ret = sdp_clrset(state, ADV748X_SDP_FRP, ADV748X_SDP_FRP_MASK, enable
>> ? ctrl->val - 1 : 0);
>>
>> Fixes: 3e89586a64df ("media: i2c: adv748x: add adv748x driver")
>> Reported-by: Dmitry Vyukov <dvyukov@google.com>
>> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com
>
> It doesn't look like this was picked up? I still see this warning on
> 5.5-rc6 and next-20200113.
>
> If it helps:
>
> Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
>

Thank you, Nathan! :)


Friendly ping:

Who can take this?

It's been almost three months now since I first sent this patch out.

Thanks!
--
Gustavo

>> ---
>>  drivers/media/i2c/adv748x/adv748x.h | 8 ++++----
>>  1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/media/i2c/adv748x/adv748x.h  
>> b/drivers/media/i2c/adv748x/adv748x.h
>> index 5042f9e94aee..fccb388ce179 100644
>> --- a/drivers/media/i2c/adv748x/adv748x.h
>> +++ b/drivers/media/i2c/adv748x/adv748x.h
>> @@ -394,10 +394,10 @@ int adv748x_write_block(struct adv748x_state  
>> *state, int client_page,
>>
>>  #define io_read(s, r) adv748x_read(s, ADV748X_PAGE_IO, r)
>>  #define io_write(s, r, v) adv748x_write(s, ADV748X_PAGE_IO, r, v)
>> -#define io_clrset(s, r, m, v) io_write(s, r, (io_read(s, r) & ~m) | v)
>> +#define io_clrset(s, r, m, v) io_write(s, r, (io_read(s, r) & ~(m)) | (v))
>>
>>  #define hdmi_read(s, r) adv748x_read(s, ADV748X_PAGE_HDMI, r)
>> -#define hdmi_read16(s, r, m) (((hdmi_read(s, r) << 8) |  
>> hdmi_read(s, r+1)) & m)
>> +#define hdmi_read16(s, r, m) (((hdmi_read(s, r) << 8) |  
>> hdmi_read(s, (r)+1)) & (m))
>>  #define hdmi_write(s, r, v) adv748x_write(s, ADV748X_PAGE_HDMI, r, v)
>>
>>  #define repeater_read(s, r) adv748x_read(s, ADV748X_PAGE_REPEATER, r)
>> @@ -405,11 +405,11 @@ int adv748x_write_block(struct adv748x_state  
>> *state, int client_page,
>>
>>  #define sdp_read(s, r) adv748x_read(s, ADV748X_PAGE_SDP, r)
>>  #define sdp_write(s, r, v) adv748x_write(s, ADV748X_PAGE_SDP, r, v)
>> -#define sdp_clrset(s, r, m, v) sdp_write(s, r, (sdp_read(s, r) & ~m) | v)
>> +#define sdp_clrset(s, r, m, v) sdp_write(s, r, (sdp_read(s, r) &  
>> ~(m)) | (v))
>>
>>  #define cp_read(s, r) adv748x_read(s, ADV748X_PAGE_CP, r)
>>  #define cp_write(s, r, v) adv748x_write(s, ADV748X_PAGE_CP, r, v)
>> -#define cp_clrset(s, r, m, v) cp_write(s, r, (cp_read(s, r) & ~m) | v)
>> +#define cp_clrset(s, r, m, v) cp_write(s, r, (cp_read(s, r) & ~(m)) | (v))
>>
>>  #define tx_read(t, r) adv748x_read(t->state, t->page, r)
>>  #define tx_write(t, r, v) adv748x_write(t->state, t->page, r, v)
>> --
>> 2.23.0
>>

Re: [PATCH] media: i2c: adv748x: Fix unsafe macros

[Nick Desaulniers]

On Thu, Jan 16, 2020 at 1:45 PM Gustavo A. R. Silva
<gustavo@embeddedor.com> wrote:
>
> Hi!
> Friendly ping:
>
> Who can take this?
>
> It's been almost three months now since I first sent this patch out.

Kieran is listed as maintainer of:
  998 F:  drivers/media/i2c/adv748x/*

but I'm guessing the tree would be Mauro's.  It would be good if
Kieran can review, then Mauro can pick up?

-- 
Thanks,
~Nick Desaulniers

Re: [PATCH] media: i2c: adv748x: Fix unsafe macros

[Kieran Bingham]

Hi Nick

On 16/01/2020 21:51, Nick Desaulniers wrote:
> On Thu, Jan 16, 2020 at 1:45 PM Gustavo A. R. Silva
> <gustavo@embeddedor.com> wrote:
>>
>> Hi!
>> Friendly ping:
>>
>> Who can take this?
>>
>> It's been almost three months now since I first sent this patch out.
> 
> Kieran is listed as maintainer of:
>   998 F:  drivers/media/i2c/adv748x/*
> 
> but I'm guessing the tree would be Mauro's.  It would be good if
> Kieran can review, then Mauro can pick up?

Already done on the 22nd October 2019:

https://lore.kernel.org/linux-media/22780ef3-514e-d013-1da8-9576780fde1c@ideasonboard.com/

Hans, Should this go through you?

Or are we just waiting for Mauro to pick it up?

-- 
Regards
--
Kieran

Re: [PATCH] media: i2c: adv748x: Fix unsafe macros

[Hans Verkuil]

On 1/14/20 12:14 AM, Nathan Chancellor wrote:
> On Tue, Oct 22, 2019 at 08:25:22AM -0500, Gustavo A. R. Silva wrote:
>> Enclose multiple macro parameters in parentheses in order to
>> make such macros safer and fix the Clang warning below:
>>
>> drivers/media/i2c/adv748x/adv748x-afe.c:452:12: warning: operator '?:'
>> has lower precedence than '|'; '|' will be evaluated first
>> [-Wbitwise-conditional-parentheses]
>>
>> ret = sdp_clrset(state, ADV748X_SDP_FRP, ADV748X_SDP_FRP_MASK, enable
>> ? ctrl->val - 1 : 0);
>>
>> Fixes: 3e89586a64df ("media: i2c: adv748x: add adv748x driver")
>> Reported-by: Dmitry Vyukov <dvyukov@google.com>
>> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com
> 
> It doesn't look like this was picked up? I still see this warning on
> 5.5-rc6 and next-20200113.

It's been picked up some time ago and will appear in 5.6.

Regards,

	Hans

> 
> If it helps:
> 
> Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
> 
>> ---
>>  drivers/media/i2c/adv748x/adv748x.h | 8 ++++----
>>  1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/media/i2c/adv748x/adv748x.h b/drivers/media/i2c/adv748x/adv748x.h
>> index 5042f9e94aee..fccb388ce179 100644
>> --- a/drivers/media/i2c/adv748x/adv748x.h
>> +++ b/drivers/media/i2c/adv748x/adv748x.h
>> @@ -394,10 +394,10 @@ int adv748x_write_block(struct adv748x_state *state, int client_page,
>>  
>>  #define io_read(s, r) adv748x_read(s, ADV748X_PAGE_IO, r)
>>  #define io_write(s, r, v) adv748x_write(s, ADV748X_PAGE_IO, r, v)
>> -#define io_clrset(s, r, m, v) io_write(s, r, (io_read(s, r) & ~m) | v)
>> +#define io_clrset(s, r, m, v) io_write(s, r, (io_read(s, r) & ~(m)) | (v))
>>  
>>  #define hdmi_read(s, r) adv748x_read(s, ADV748X_PAGE_HDMI, r)
>> -#define hdmi_read16(s, r, m) (((hdmi_read(s, r) << 8) | hdmi_read(s, r+1)) & m)
>> +#define hdmi_read16(s, r, m) (((hdmi_read(s, r) << 8) | hdmi_read(s, (r)+1)) & (m))
>>  #define hdmi_write(s, r, v) adv748x_write(s, ADV748X_PAGE_HDMI, r, v)
>>  
>>  #define repeater_read(s, r) adv748x_read(s, ADV748X_PAGE_REPEATER, r)
>> @@ -405,11 +405,11 @@ int adv748x_write_block(struct adv748x_state *state, int client_page,
>>  
>>  #define sdp_read(s, r) adv748x_read(s, ADV748X_PAGE_SDP, r)
>>  #define sdp_write(s, r, v) adv748x_write(s, ADV748X_PAGE_SDP, r, v)
>> -#define sdp_clrset(s, r, m, v) sdp_write(s, r, (sdp_read(s, r) & ~m) | v)
>> +#define sdp_clrset(s, r, m, v) sdp_write(s, r, (sdp_read(s, r) & ~(m)) | (v))
>>  
>>  #define cp_read(s, r) adv748x_read(s, ADV748X_PAGE_CP, r)
>>  #define cp_write(s, r, v) adv748x_write(s, ADV748X_PAGE_CP, r, v)
>> -#define cp_clrset(s, r, m, v) cp_write(s, r, (cp_read(s, r) & ~m) | v)
>> +#define cp_clrset(s, r, m, v) cp_write(s, r, (cp_read(s, r) & ~(m)) | (v))
>>  
>>  #define tx_read(t, r) adv748x_read(t->state, t->page, r)
>>  #define tx_write(t, r, v) adv748x_write(t->state, t->page, r, v)
>> -- 
>> 2.23.0
>>

Re: [PATCH] media: i2c: adv748x: Fix unsafe macros

[Nick Desaulniers]

On Thu, Jan 16, 2020 at 11:25 PM Hans Verkuil <hverkuil@xs4all.nl> wrote:
>
> On 1/14/20 12:14 AM, Nathan Chancellor wrote:
> > On Tue, Oct 22, 2019 at 08:25:22AM -0500, Gustavo A. R. Silva wrote:
> >> Enclose multiple macro parameters in parentheses in order to
> >> make such macros safer and fix the Clang warning below:
> >>
> >> drivers/media/i2c/adv748x/adv748x-afe.c:452:12: warning: operator '?:'
> >> has lower precedence than '|'; '|' will be evaluated first
> >> [-Wbitwise-conditional-parentheses]
> >>
> >> ret = sdp_clrset(state, ADV748X_SDP_FRP, ADV748X_SDP_FRP_MASK, enable
> >> ? ctrl->val - 1 : 0);
> >>
> >> Fixes: 3e89586a64df ("media: i2c: adv748x: add adv748x driver")
> >> Reported-by: Dmitry Vyukov <dvyukov@google.com>
> >> Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com
> >
> > It doesn't look like this was picked up? I still see this warning on
> > 5.5-rc6 and next-20200113.
>
> It's been picked up some time ago and will appear in 5.6.

https://git.linuxtv.org/media_tree.git/commit/?id=0d962e061abcf1b9105f88fb850158b5887fbca3

-- 
Thanks,
~Nick Desaulniers