[PATCH] usb: renesas_usbhs: simplify list handling

[PATCH] usb: renesas_usbhs: simplify list handling

[Nicholas Mc Guire]

The current code is effectively equivalent to list_first_entry_or_null()
so simply switch and simplify the code.

Fixes: 6acb95d4e070 ("usb: renesas_usbhs: modify packet queue control method")
Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
---
Found by simple coccinelle scanner

Compile tested with: multi_v7_defconfig (implies 
CONFIG_USB_RENESAS_USBHS=m)

Patch is against 4.9.0-rc2 (localversion-next is next-20161028)

 drivers/usb/renesas_usbhs/fifo.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c
index 857e783..d1af831 100644
--- a/drivers/usb/renesas_usbhs/fifo.c
+++ b/drivers/usb/renesas_usbhs/fifo.c
@@ -100,10 +100,7 @@ static void __usbhsf_pkt_del(struct usbhs_pkt *pkt)
 
 static struct usbhs_pkt *__usbhsf_pkt_get(struct usbhs_pipe *pipe)
 {
-	if (list_empty(&pipe->list))
-		return NULL;
-
-	return list_first_entry(&pipe->list, struct usbhs_pkt, node);
+	return list_first_entry_or_null(&pipe->list, struct usbhs_pkt, node);
 }
 
 static void usbhsf_fifo_clear(struct usbhs_pipe *pipe,
-- 
1.7.10.4

RE: [PATCH] usb: renesas_usbhs: simplify list handling

[Yoshihiro Shimoda]

Hi,

> From: Nicholas Mc Guire
> Sent: Tuesday, November 08, 2016 4:07 AM
> 
> The current code is effectively equivalent to list_first_entry_or_null()
> so simply switch and simplify the code.
> 
> Fixes: 6acb95d4e070 ("usb: renesas_usbhs: modify packet queue control method")
> Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
> ---
> Found by simple coccinelle scanner
> 
> Compile tested with: multi_v7_defconfig (implies
> CONFIG_USB_RENESAS_USBHS=m)
> 
> Patch is against 4.9.0-rc2 (localversion-next is next-20161028)

Thank you for the patch!
However, such a patch is already merged in the Felipe's usb.git repository unfortunately...
https://git.kernel.org/cgit/linux/kernel/git/balbi/usb.git/commit/?h=testing/next&id=31faf878bd8c7e2c078a3b75f65efe64f23b0f18
So, the patch will appear in linux-next repository in the future.

Best regards,
Yoshihiro Shimoda

Re: [PATCH] usb: renesas_usbhs: simplify list handling

[Masahiro Yamada]

>> Fixes: 6acb95d4e070 ("usb: renesas_usbhs: modify packet queue control method")


This is not a fix, but a clean-up patch.



>> Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
>> ---
>> Found by simple coccinelle scanner
>>
>> Compile tested with: multi_v7_defconfig (implies
>> CONFIG_USB_RENESAS_USBHS=m)
>>
>> Patch is against 4.9.0-rc2 (localversion-next is next-20161028)
>
> Thank you for the patch!
> However, such a patch is already merged in the Felipe's usb.git repository unfortunately...
> https://git.kernel.org/cgit/linux/kernel/git/balbi/usb.git/commit/?h=testing/next&id=31faf878bd8c7e2c078a3b75f65efe64f23b0f18
> So, the patch will appear in linux-next repository in the future.


Likewise for
drivers/usb/dwc3/gadget.h
drivers/usb/dwc2/gadget.c


-- 
Best Regards
Masahiro Yamada

Re: [PATCH] usb: renesas_usbhs: simplify list handling

[Nicholas Mc Guire]

On Tue, Nov 08, 2016 at 12:26:45PM +0900, Masahiro Yamada wrote:
> >> Fixes: 6acb95d4e070 ("usb: renesas_usbhs: modify packet queue control method")
> 
> 
> This is not a fix, but a clean-up patch.

true - I´ve been using it incorrectly to basically just record
the origin of the issue found - but looking at Submitting patches
this seems wrong.
In any case it would be interesting to be able to trace location
of where things go in that then need cleanups - is there an
alternative tag that could be used for that purpose ?

thx!
hofrat