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Groups > linux.kernel > #1295449 > unrolled thread

[PATCH] USB-FHCI: Use a signed return type for fhci_create_ep()

Started bySF Markus Elfring <elfring@users.sourceforge.net>
First post2015-12-19 21:20 +0100
Last post2015-12-19 21:50 +0100
Articles 8 — 3 participants

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  [PATCH] USB-FHCI: Use a signed return type for fhci_create_ep() SF Markus Elfring <elfring@users.sourceforge.net> - 2015-12-19 21:20 +0100
    Re: [PATCH] USB-FHCI: Use a signed return type for fhci_create_ep() Dan Carpenter <dan.carpenter@oracle.com> - 2015-12-19 21:30 +0100
      Re: [PATCH] USB-FHCI: Use a signed return type for fhci_create_ep() SF Markus Elfring <elfring@users.sourceforge.net> - 2015-12-19 22:00 +0100
        Re: [PATCH] USB-FHCI: Use a signed return type for fhci_create_ep() Dan Carpenter <dan.carpenter@oracle.com> - 2015-12-19 22:10 +0100
      [PATCH v2 0/2] USB-FHCI: Use return type "int" for two functions SF Markus Elfring <elfring@users.sourceforge.net> - 2015-12-22 16:50 +0100
        [PATCH v2 1/2] USB-FHCI: Use a signed return type for  fhci_create_ep() SF Markus Elfring <elfring@users.sourceforge.net> - 2015-12-22 17:00 +0100
        [PATCH v2 2/2] USB-FHCI: Use a signed return type for  endpoint_zero_init() SF Markus Elfring <elfring@users.sourceforge.net> - 2015-12-22 17:00 +0100
    Re: [PATCH] USB-FHCI: Use a signed return type for fhci_create_ep() Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> - 2015-12-19 21:50 +0100

#1295449 — [PATCH] USB-FHCI: Use a signed return type for fhci_create_ep()

FromSF Markus Elfring <elfring@users.sourceforge.net>
Date2015-12-19 21:20 +0100
Subject[PATCH] USB-FHCI: Use a signed return type for fhci_create_ep()
Message-ID<qHw8W-7P7-19@gated-at.bofh.it>
From: Markus Elfring <elfring@users.sourceforge.net>
Date: Sat, 19 Dec 2015 21:10:20 +0100

The return type "u32" was used by the fhci_create_ep() function even though
it will eventually return a negative error code.
Improve this implementation detail by using the type "s32" instead.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/usb/host/fhci-tds.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/host/fhci-tds.c b/drivers/usb/host/fhci-tds.c
index f82ad5d..c1ae172 100644
--- a/drivers/usb/host/fhci-tds.c
+++ b/drivers/usb/host/fhci-tds.c
@@ -149,7 +149,7 @@ void fhci_ep0_free(struct fhci_usb *usb)
  * data_mem	The data memory partition(BUS)
  * ring_len	TD ring length
  */
-u32 fhci_create_ep(struct fhci_usb *usb, enum fhci_mem_alloc data_mem,
+s32 fhci_create_ep(struct fhci_usb *usb, enum fhci_mem_alloc data_mem,
 			   u32 ring_len)
 {
 	struct endpoint *ep;
-- 
2.6.3

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#1295453

FromDan Carpenter <dan.carpenter@oracle.com>
Date2015-12-19 21:30 +0100
Message-ID<qHwiC-7SO-7@gated-at.bofh.it>
In reply to#1295449
Just make it an int.  The caller also casts it to u32...

regards,
dan carpenter

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#1295468

FromSF Markus Elfring <elfring@users.sourceforge.net>
Date2015-12-19 22:00 +0100
Message-ID<qHwLE-84r-19@gated-at.bofh.it>
In reply to#1295453
> Just make it an int.

Thanks for your suggestion.

Will any more software developers prefer this data type
at some source code places?


> The caller also casts it to u32...

Do you want to get rid of similar casts in affected functions?

Regards,
Markus
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#1295469

FromDan Carpenter <dan.carpenter@oracle.com>
Date2015-12-19 22:10 +0100
Message-ID<qHwVk-8mU-5@gated-at.bofh.it>
In reply to#1295468
On Sat, Dec 19, 2015 at 09:55:02PM +0100, SF Markus Elfring wrote:
> > Just make it an int.
> 
> Thanks for your suggestion.
> 
> Will any more software developers prefer this data type
> at some source code places?
> 

Use s32 if the hardware spec specifies that you must.  Otherwise prefer
ordinary types.

> 
> > The caller also casts it to u32...
> 
> Do you want to get rid of similar casts in affected functions?

If you want, that would be great.  I just enjoy complaining generally,
though.  :P

regards,
dan carpenter

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#1296850 — [PATCH v2 0/2] USB-FHCI: Use return type "int" for two functions

FromSF Markus Elfring <elfring@users.sourceforge.net>
Date2015-12-22 16:50 +0100
Subject[PATCH v2 0/2] USB-FHCI: Use return type "int" for two functions
Message-ID<qIxmi-5MK-17@gated-at.bofh.it>
In reply to#1295453
From: Markus Elfring <elfring@users.sourceforge.net>
Date: Tue, 22 Dec 2015 16:43:12 +0100

Another update suggestion was taken into account after a patch was applied
from static source code analysis.

Markus Elfring (2):
  Use a signed return type for fhci_create_ep()
  Use a signed return type for endpoint_zero_init()

 drivers/usb/host/fhci-hcd.c | 4 ++--
 drivers/usb/host/fhci-tds.c | 2 +-
 drivers/usb/host/fhci.h     | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

-- 
2.6.3

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#1296859 — [PATCH v2 1/2] USB-FHCI: Use a signed return type for fhci_create_ep()

FromSF Markus Elfring <elfring@users.sourceforge.net>
Date2015-12-22 17:00 +0100
Subject[PATCH v2 1/2] USB-FHCI: Use a signed return type for fhci_create_ep()
Message-ID<qIxvX-5Qb-3@gated-at.bofh.it>
In reply to#1296850
From: Markus Elfring <elfring@users.sourceforge.net>
Date: Tue, 22 Dec 2015 16:10:14 +0100

The return type "u32" was used by the fhci_create_ep() function even though
it will eventually return a negative error code.
Improve this implementation detail by using the type "int" instead.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/usb/host/fhci-tds.c | 2 +-
 drivers/usb/host/fhci.h     | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/fhci-tds.c b/drivers/usb/host/fhci-tds.c
index f82ad5d..fc0b525 100644
--- a/drivers/usb/host/fhci-tds.c
+++ b/drivers/usb/host/fhci-tds.c
@@ -149,7 +149,7 @@ void fhci_ep0_free(struct fhci_usb *usb)
  * data_mem	The data memory partition(BUS)
  * ring_len	TD ring length
  */
-u32 fhci_create_ep(struct fhci_usb *usb, enum fhci_mem_alloc data_mem,
+int fhci_create_ep(struct fhci_usb *usb, enum fhci_mem_alloc data_mem,
 			   u32 ring_len)
 {
 	struct endpoint *ep;
diff --git a/drivers/usb/host/fhci.h b/drivers/usb/host/fhci.h
index 154e6a0..afa3cfc 100644
--- a/drivers/usb/host/fhci.h
+++ b/drivers/usb/host/fhci.h
@@ -547,7 +547,7 @@ u32 fhci_host_transaction(struct fhci_usb *usb, struct packet *pkt,
 void fhci_host_transmit_actual_frame(struct fhci_usb *usb);
 void fhci_tx_conf_interrupt(struct fhci_usb *usb);
 void fhci_push_dummy_bd(struct endpoint *ep);
-u32 fhci_create_ep(struct fhci_usb *usb, enum fhci_mem_alloc data_mem,
+int fhci_create_ep(struct fhci_usb *usb, enum fhci_mem_alloc data_mem,
 		   u32 ring_len);
 void fhci_init_ep_registers(struct fhci_usb *usb,
 			    struct endpoint *ep,
-- 
2.6.3

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#1296861 — [PATCH v2 2/2] USB-FHCI: Use a signed return type for endpoint_zero_init()

FromSF Markus Elfring <elfring@users.sourceforge.net>
Date2015-12-22 17:00 +0100
Subject[PATCH v2 2/2] USB-FHCI: Use a signed return type for endpoint_zero_init()
Message-ID<qIxvY-5Qb-13@gated-at.bofh.it>
In reply to#1296850
From: Markus Elfring <elfring@users.sourceforge.net>
Date: Tue, 22 Dec 2015 16:24:46 +0100

The return type "u32" was used by the endpoint_zero_init() function
even though it can return a value which corresponds to a negative
error code from a call of the fhci_create_ep() function.
Improve this implementation detail by using the type "int" instead.

Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
---
 drivers/usb/host/fhci-hcd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/fhci-hcd.c b/drivers/usb/host/fhci-hcd.c
index c6cebb9..b2889f0 100644
--- a/drivers/usb/host/fhci-hcd.c
+++ b/drivers/usb/host/fhci-hcd.c
@@ -64,11 +64,11 @@ u16 fhci_get_sof_timer_count(struct fhci_usb *usb)
 }
 
 /* initialize the endpoint zero */
-static u32 endpoint_zero_init(struct fhci_usb *usb,
+static int endpoint_zero_init(struct fhci_usb *usb,
 			      enum fhci_mem_alloc data_mem,
 			      u32 ring_len)
 {
-	u32 rc;
+	int rc;
 
 	rc = fhci_create_ep(usb, data_mem, ring_len);
 	if (rc)
-- 
2.6.3

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#1295463

FromSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Date2015-12-19 21:50 +0100
Message-ID<qHwBY-814-17@gated-at.bofh.it>
In reply to#1295449
Hello.

On 12/19/2015 11:15 PM, SF Markus Elfring wrote:

> From: Markus Elfring <elfring@users.sourceforge.net>
> Date: Sat, 19 Dec 2015 21:10:20 +0100
>
> The return type "u32" was used by the fhci_create_ep() function even though
> it will eventually return a negative error code.
> Improve this implementation detail by using the type "s32" instead.
>
> This issue was detected by using the Coccinelle software.
>
> Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
> ---
>   drivers/usb/host/fhci-tds.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/host/fhci-tds.c b/drivers/usb/host/fhci-tds.c
> index f82ad5d..c1ae172 100644
> --- a/drivers/usb/host/fhci-tds.c
> +++ b/drivers/usb/host/fhci-tds.c
> @@ -149,7 +149,7 @@ void fhci_ep0_free(struct fhci_usb *usb)
>    * data_mem	The data memory partition(BUS)
>    * ring_len	TD ring length
>    */
> -u32 fhci_create_ep(struct fhci_usb *usb, enum fhci_mem_alloc data_mem,
> +s32 fhci_create_ep(struct fhci_usb *usb, enum fhci_mem_alloc data_mem,

    Should be just *int*, I think.

[...]

MBR, Sergei

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