In preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.
This patch fixes the following warnings:
drivers/firewire/core-device.c: In function ‘set_broadcast_channel’:
drivers/firewire/core-device.c:969:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
if (data & cpu_to_be32(1 << 31)) {
^
drivers/firewire/core-device.c:974:3: note: here
case RCODE_ADDRESS_ERROR:
^~~~
drivers/firewire/core-iso.c: In function ‘manage_channel’:
drivers/firewire/core-iso.c:308:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
if ((data[0] & bit) == (data[1] & bit))
^
drivers/firewire/core-iso.c:312:3: note: here
default:
^~~~~~~
drivers/firewire/core-topology.c: In function ‘count_ports’:
drivers/firewire/core-topology.c:69:23: warning: this statement may fall through [-Wimplicit-fallthrough=]
(*child_port_count)++;
~~~~~~~~~~~~~~~~~~~^~
drivers/firewire/core-topology.c:70:3: note: here
case SELFID_PORT_PARENT:
^~~~
Warning level 3 was used: -Wimplicit-fallthrough=3
Notice that in some cases, the code comment is modified in
accordance with what GCC is expecting to find.
This patch is part of the ongoing efforts to enable
-Wimplicit-fallthrough.
Signed-off-by: Gustavo A. R. Silva <[email protected]>
---
drivers/firewire/core-device.c | 2 +-
drivers/firewire/core-iso.c | 2 +-
drivers/firewire/core-topology.c | 1 +
3 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
index 7c2eed76011e..0c86548fa4a7 100644
--- a/drivers/firewire/core-device.c
+++ b/drivers/firewire/core-device.c
@@ -970,7 +970,7 @@ static void set_broadcast_channel(struct fw_device *device, int generation)
device->bc_implemented = BC_IMPLEMENTED;
break;
}
- /* else fall through to case address error */
+ /* else, fall through - to case address error */
case RCODE_ADDRESS_ERROR:
device->bc_implemented = BC_UNIMPLEMENTED;
}
diff --git a/drivers/firewire/core-iso.c b/drivers/firewire/core-iso.c
index 35e784cffc23..7e5c98840b80 100644
--- a/drivers/firewire/core-iso.c
+++ b/drivers/firewire/core-iso.c
@@ -308,7 +308,7 @@ static int manage_channel(struct fw_card *card, int irm_id, int generation,
if ((data[0] & bit) == (data[1] & bit))
continue;
- /* 1394-1995 IRM, fall through to retry. */
+ /* fall through - to retry for 1394-1995 IRM */
default:
if (retry) {
retry--;
diff --git a/drivers/firewire/core-topology.c b/drivers/firewire/core-topology.c
index 7db234d3fbdd..82c67e900aad 100644
--- a/drivers/firewire/core-topology.c
+++ b/drivers/firewire/core-topology.c
@@ -67,6 +67,7 @@ static u32 *count_ports(u32 *sid, int *total_port_count, int *child_port_count)
switch (port_type) {
case SELFID_PORT_CHILD:
(*child_port_count)++;
+ /* fall through */
case SELFID_PORT_PARENT:
case SELFID_PORT_NCONN:
(*total_port_count)++;
--
2.20.1
(added Cc: Mathieu Malaterre, who sent a patch which is a subset of this)
On Feb 11 Gustavo A. R. Silva wrote:
> In preparation to enabling -Wimplicit-fallthrough, mark switch
> cases where we are expecting to fall through.
>
> This patch fixes the following warnings:
>
> drivers/firewire/core-device.c: In function ‘set_broadcast_channel’:
> drivers/firewire/core-device.c:969:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
> if (data & cpu_to_be32(1 << 31)) {
> ^
> drivers/firewire/core-device.c:974:3: note: here
> case RCODE_ADDRESS_ERROR:
> ^~~~
> drivers/firewire/core-iso.c: In function ‘manage_channel’:
> drivers/firewire/core-iso.c:308:7: warning: this statement may fall through [-Wimplicit-fallthrough=]
> if ((data[0] & bit) == (data[1] & bit))
> ^
> drivers/firewire/core-iso.c:312:3: note: here
> default:
> ^~~~~~~
> drivers/firewire/core-topology.c: In function ‘count_ports’:
> drivers/firewire/core-topology.c:69:23: warning: this statement may fall through [-Wimplicit-fallthrough=]
> (*child_port_count)++;
> ~~~~~~~~~~~~~~~~~~~^~
> drivers/firewire/core-topology.c:70:3: note: here
> case SELFID_PORT_PARENT:
> ^~~~
>
> Warning level 3 was used: -Wimplicit-fallthrough=3
>
> Notice that in some cases, the code comment is modified in
> accordance with what GCC is expecting to find.
OK, I looked up
https://gcc.gnu.org/onlinedocs/gcc-8.3.0/gcc/Warning-Options.html#index-Wimplicit-fallthrough
now. I am loudly sighing and rolling my eyes... Anyway; the last regex
listed at the Wimplicit-fallthrough=3 bullet point is obviously the one
you are wanting to match.
> This patch is part of the ongoing efforts to enable
> -Wimplicit-fallthrough.
>
> Signed-off-by: Gustavo A. R. Silva <[email protected]>
> ---
> drivers/firewire/core-device.c | 2 +-
> drivers/firewire/core-iso.c | 2 +-
> drivers/firewire/core-topology.c | 1 +
> 3 files changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/firewire/core-device.c b/drivers/firewire/core-device.c
> index 7c2eed76011e..0c86548fa4a7 100644
> --- a/drivers/firewire/core-device.c
> +++ b/drivers/firewire/core-device.c
> @@ -970,7 +970,7 @@ static void set_broadcast_channel(struct fw_device *device, int generation)
> device->bc_implemented = BC_IMPLEMENTED;
> break;
> }
> - /* else fall through to case address error */
> + /* else, fall through - to case address error */
> case RCODE_ADDRESS_ERROR:
> device->bc_implemented = BC_UNIMPLEMENTED;
> }
> diff --git a/drivers/firewire/core-iso.c b/drivers/firewire/core-iso.c
> index 35e784cffc23..7e5c98840b80 100644
> --- a/drivers/firewire/core-iso.c
> +++ b/drivers/firewire/core-iso.c
> @@ -308,7 +308,7 @@ static int manage_channel(struct fw_card *card, int irm_id, int generation,
> if ((data[0] & bit) == (data[1] & bit))
> continue;
>
> - /* 1394-1995 IRM, fall through to retry. */
> + /* fall through - to retry for 1394-1995 IRM */
If you don't mind, I will apply your patch with a different wording of this
comment:
/* fall through - It's an 1394-1995 IRM, retry. */
I'll mark my modification to your patch in the signed-off-by-tag.
> default:
> if (retry) {
> retry--;
> diff --git a/drivers/firewire/core-topology.c b/drivers/firewire/core-topology.c
> index 7db234d3fbdd..82c67e900aad 100644
> --- a/drivers/firewire/core-topology.c
> +++ b/drivers/firewire/core-topology.c
> @@ -67,6 +67,7 @@ static u32 *count_ports(u32 *sid, int *total_port_count, int *child_port_count)
> switch (port_type) {
> case SELFID_PORT_CHILD:
> (*child_port_count)++;
> + /* fall through */
> case SELFID_PORT_PARENT:
> case SELFID_PORT_NCONN:
> (*total_port_count)++;
--
Stefan Richter
-======---== --== -===-
http://arcgraph.de/sr/
On 3/14/19 5:00 AM, Stefan Richter wrote:
[..]
>> diff --git a/drivers/firewire/core-iso.c b/drivers/firewire/core-iso.c
>> index 35e784cffc23..7e5c98840b80 100644
>> --- a/drivers/firewire/core-iso.c
>> +++ b/drivers/firewire/core-iso.c
>> @@ -308,7 +308,7 @@ static int manage_channel(struct fw_card *card, int irm_id, int generation,
>> if ((data[0] & bit) == (data[1] & bit))
>> continue;
>>
>> - /* 1394-1995 IRM, fall through to retry. */
>> + /* fall through - to retry for 1394-1995 IRM */
>
> If you don't mind, I will apply your patch with a different wording of this
> comment:
>
> /* fall through - It's an 1394-1995 IRM, retry. */
>
> I'll mark my modification to your patch in the signed-off-by-tag.
>
Sure. That's fine with me.
Thank you.
--
Gustavo