[-next] usb: host: drop pointless static qualifier
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Message ID 20190123083758.8412-1-yuehaibing@huawei.com
State Not Applicable
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  • [-next] usb: host: drop pointless static qualifier
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Commit Message

YueHaibing Jan. 23, 2019, 8:37 a.m. UTC
There is no need to have the 'dummy_mask' variable static since new
value always be assigned before use it.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
---
 drivers/usb/host/ehci-ps3.c | 2 +-
 drivers/usb/host/ohci-ps3.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

Comments

Alan Stern Jan. 23, 2019, 4:09 p.m. UTC | #1
On Wed, 23 Jan 2019, YueHaibing wrote:

> There is no need to have the 'dummy_mask' variable static since new
> value always be assigned before use it.
> 
> Signed-off-by: YueHaibing <yuehaibing@huawei.com>
> ---
>  drivers/usb/host/ehci-ps3.c | 2 +-
>  drivers/usb/host/ohci-ps3.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/host/ehci-ps3.c b/drivers/usb/host/ehci-ps3.c
> index 454d8c6..91cee02 100644
> --- a/drivers/usb/host/ehci-ps3.c
> +++ b/drivers/usb/host/ehci-ps3.c
> @@ -86,7 +86,7 @@ static int ps3_ehci_probe(struct ps3_system_bus_device *dev)
>  	int result;
>  	struct usb_hcd *hcd;
>  	unsigned int virq;
> -	static u64 dummy_mask;
> +	u64 dummy_mask;
>  
>  	if (usb_disabled()) {
>  		result = -ENODEV;
> diff --git a/drivers/usb/host/ohci-ps3.c b/drivers/usb/host/ohci-ps3.c
> index 395f9d3..a1c1bdf 100644
> --- a/drivers/usb/host/ohci-ps3.c
> +++ b/drivers/usb/host/ohci-ps3.c
> @@ -69,7 +69,7 @@ static int ps3_ohci_probe(struct ps3_system_bus_device *dev)
>  	int result;
>  	struct usb_hcd *hcd;
>  	unsigned int virq;
> -	static u64 dummy_mask;
> +	u64 dummy_mask;
>  
>  	if (usb_disabled()) {
>  		result = -ENODEV;

No.  You need to read the code and understand how a variable is used
before you decide to modify it.

In this case, a suitable approach would be to change the declaration 
so that it says:

	status u64 dummy_mask = DMA_BIT_MASK(32);

and remove the line that does the assignment dynamically.

Alan Stern
YueHaibing Jan. 24, 2019, 3:13 a.m. UTC | #2
On 2019/1/24 0:09, Alan Stern wrote:
> On Wed, 23 Jan 2019, YueHaibing wrote:
> 
>> There is no need to have the 'dummy_mask' variable static since new
>> value always be assigned before use it.
>>
>> Signed-off-by: YueHaibing <yuehaibing@huawei.com>
>> ---
>>  drivers/usb/host/ehci-ps3.c | 2 +-
>>  drivers/usb/host/ohci-ps3.c | 2 +-
>>  2 files changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/usb/host/ehci-ps3.c b/drivers/usb/host/ehci-ps3.c
>> index 454d8c6..91cee02 100644
>> --- a/drivers/usb/host/ehci-ps3.c
>> +++ b/drivers/usb/host/ehci-ps3.c
>> @@ -86,7 +86,7 @@ static int ps3_ehci_probe(struct ps3_system_bus_device *dev)
>>  	int result;
>>  	struct usb_hcd *hcd;
>>  	unsigned int virq;
>> -	static u64 dummy_mask;
>> +	u64 dummy_mask;
>>  
>>  	if (usb_disabled()) {
>>  		result = -ENODEV;
>> diff --git a/drivers/usb/host/ohci-ps3.c b/drivers/usb/host/ohci-ps3.c
>> index 395f9d3..a1c1bdf 100644
>> --- a/drivers/usb/host/ohci-ps3.c
>> +++ b/drivers/usb/host/ohci-ps3.c
>> @@ -69,7 +69,7 @@ static int ps3_ohci_probe(struct ps3_system_bus_device *dev)
>>  	int result;
>>  	struct usb_hcd *hcd;
>>  	unsigned int virq;
>> -	static u64 dummy_mask;
>> +	u64 dummy_mask;
>>  
>>  	if (usb_disabled()) {
>>  		result = -ENODEV;
> 
> No.  You need to read the code and understand how a variable is used
> before you decide to modify it.

Sorry, I misread the code, so just leave it as is.

> 
> In this case, a suitable approach would be to change the declaration 
> so that it says:
> 
> 	status u64 dummy_mask = DMA_BIT_MASK(32);
> 
> and remove the line that does the assignment dynamically.
> 
> Alan Stern
> 
> 
> .
>

Patch
diff mbox series

diff --git a/drivers/usb/host/ehci-ps3.c b/drivers/usb/host/ehci-ps3.c
index 454d8c6..91cee02 100644
--- a/drivers/usb/host/ehci-ps3.c
+++ b/drivers/usb/host/ehci-ps3.c
@@ -86,7 +86,7 @@  static int ps3_ehci_probe(struct ps3_system_bus_device *dev)
 	int result;
 	struct usb_hcd *hcd;
 	unsigned int virq;
-	static u64 dummy_mask;
+	u64 dummy_mask;
 
 	if (usb_disabled()) {
 		result = -ENODEV;
diff --git a/drivers/usb/host/ohci-ps3.c b/drivers/usb/host/ohci-ps3.c
index 395f9d3..a1c1bdf 100644
--- a/drivers/usb/host/ohci-ps3.c
+++ b/drivers/usb/host/ohci-ps3.c
@@ -69,7 +69,7 @@  static int ps3_ohci_probe(struct ps3_system_bus_device *dev)
 	int result;
 	struct usb_hcd *hcd;
 	unsigned int virq;
-	static u64 dummy_mask;
+	u64 dummy_mask;
 
 	if (usb_disabled()) {
 		result = -ENODEV;