[PATCH] PNP: isapnp: remove set but not used variable 'checksum'

[PATCH] PNP: isapnp: remove set but not used variable 'checksum'

[yu kuai]

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/pnp/isapnp/core.c: In function ‘isapnp_build_device_list’:
drivers/pnp/isapnp/core.c:777:27: warning: variable ‘checksum’ set
but not used [-Wunused-but-set-variable]

It is never used, and so can be removed.

Signed-off-by: yu kuai <yukuai3@huawei.com>
---
 drivers/pnp/isapnp/core.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/pnp/isapnp/core.c b/drivers/pnp/isapnp/core.c
index 179b737280e1..e39d49bceae0 100644
--- a/drivers/pnp/isapnp/core.c
+++ b/drivers/pnp/isapnp/core.c
@@ -774,7 +774,7 @@ static unsigned char __init isapnp_checksum(unsigned char *data)
 static int __init isapnp_build_device_list(void)
 {
 	int csn;
-	unsigned char header[9], checksum;
+	unsigned char header[9];
 	struct pnp_card *card;
 	u32 eisa_id;
 	char id[8];
@@ -784,7 +784,6 @@ static int __init isapnp_build_device_list(void)
 	for (csn = 1; csn <= isapnp_csn_count; csn++) {
 		isapnp_wake(csn);
 		isapnp_peek(header, 9);
-		checksum = isapnp_checksum(header);
 		eisa_id = header[0] | header[1] << 8 |
 			  header[2] << 16 | header[3] << 24;
 		pnp_eisa_id_to_string(eisa_id, id);
-- 
2.17.2

Re: [PATCH] PNP: isapnp: remove set but not used variable 'checksum'

[Rafael J. Wysocki]

On 1/3/2020 1:17 PM, yu kuai wrote:
> Fixes gcc '-Wunused-but-set-variable' warning:
>
> drivers/pnp/isapnp/core.c: In function ‘isapnp_build_device_list’:
> drivers/pnp/isapnp/core.c:777:27: warning: variable ‘checksum’ set
> but not used [-Wunused-but-set-variable]
>
> It is never used, and so can be removed.
>
> Signed-off-by: yu kuai <yukuai3@huawei.com>
> ---
>   drivers/pnp/isapnp/core.c | 3 +--
>   1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/pnp/isapnp/core.c b/drivers/pnp/isapnp/core.c
> index 179b737280e1..e39d49bceae0 100644
> --- a/drivers/pnp/isapnp/core.c
> +++ b/drivers/pnp/isapnp/core.c
> @@ -774,7 +774,7 @@ static unsigned char __init isapnp_checksum(unsigned char *data)
>   static int __init isapnp_build_device_list(void)
>   {
>   	int csn;
> -	unsigned char header[9], checksum;
> +	unsigned char header[9];
>   	struct pnp_card *card;
>   	u32 eisa_id;
>   	char id[8];
> @@ -784,7 +784,6 @@ static int __init isapnp_build_device_list(void)
>   	for (csn = 1; csn <= isapnp_csn_count; csn++) {
>   		isapnp_wake(csn);
>   		isapnp_peek(header, 9);
> -		checksum = isapnp_checksum(header);
>   		eisa_id = header[0] | header[1] << 8 |
>   			  header[2] << 16 | header[3] << 24;
>   		pnp_eisa_id_to_string(eisa_id, id);

Applied as 5.6 material, thanks!

Note that it is recommended to CC patches that touch the PNP code to 
linux-acpi@vger.kernel.org