LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Kishon Vijay Abraham I <kishon@ti.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Mathias Nyman <mathias.nyman@intel.com>,
	Alan Stern <stern@rowland.harvard.edu>,
	<linux-usb@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<chris.chiu@canonical.com>
Subject: Re: [RFC PATCH 1/5] usb: core: hcd: Modularize HCD stop configuration in usb_stop_hcd()
Date: Tue, 24 Aug 2021 20:48:45 +0530	[thread overview]
Message-ID: <bb64fbf9-4342-7d36-de4f-0ab719b8f479@ti.com> (raw)
In-Reply-To: <YSTu5KCQV242XuXV@kroah.com>

Hi Greg,

On 24/08/21 6:36 pm, Greg Kroah-Hartman wrote:
> On Tue, Aug 24, 2021 at 04:22:58PM +0530, Kishon Vijay Abraham I wrote:
>> No functional change. Since configuration to stop HCD is invoked from
>> multiple places, group all of them in usb_stop_hcd().
>>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
>> ---
>>  drivers/usb/core/hcd.c | 42 +++++++++++++++++++++++++-----------------
>>  1 file changed, 25 insertions(+), 17 deletions(-)
>>
>> diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
>> index 0f8b7c93310e..c036ba5311b3 100644
>> --- a/drivers/usb/core/hcd.c
>> +++ b/drivers/usb/core/hcd.c
>> @@ -2760,6 +2760,29 @@ static void usb_put_invalidate_rhdev(struct usb_hcd *hcd)
>>  	usb_put_dev(rhdev);
>>  }
>>  
>> +/**
>> + * usb_stop_hcd - Halt the HCD
>> + * @hcd: the usb_hcd that has to be halted
>> + *
>> + * Stop the timer and invoke ->stop() callback on the HCD
>> + */
>> +static void usb_stop_hcd(struct usb_hcd *hcd)
>> +{
>> +	if (!hcd)
>> +		return;
> 
> That's impossible to hit, so no need to check for it, right?

Patch 3 of this series adds support for registering roothub of shared
HCD. So after that patch there can be a case where shared_hcd is NULL.
The other option would be to check for non-null value in hcd and then
invoke usb_stop_hcd().

Thanks
Kishon

  reply	other threads:[~2021-08-24 15:19 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-24 10:52 [RFC PATCH 0/5] Fix cold plugged USB device on certain PCIe USB cards Kishon Vijay Abraham I
2021-08-24 10:52 ` [RFC PATCH 1/5] usb: core: hcd: Modularize HCD stop configuration in usb_stop_hcd() Kishon Vijay Abraham I
2021-08-24 13:06   ` Greg Kroah-Hartman
2021-08-24 15:18     ` Kishon Vijay Abraham I [this message]
2021-08-26 11:14       ` Greg Kroah-Hartman
2021-08-24 10:52 ` [RFC PATCH 2/5] usb: core: hcd: Let usb_add_hcd() indicate if roothub has to be registered Kishon Vijay Abraham I
2021-08-24 13:08   ` Greg Kroah-Hartman
2021-08-24 14:56   ` Alan Stern
2021-08-24 10:53 ` [RFC PATCH 3/5] usb: core: hcd: Add support for registering secondary RH along with primary HCD Kishon Vijay Abraham I
2021-08-24 11:55   ` Mathias Nyman
2021-08-24 10:53 ` [RFC PATCH 4/5] usb: core: hcd-pci: Let usb_hcd_pci_probe() indicate if RH has to be registered Kishon Vijay Abraham I
2021-08-24 13:09   ` Greg Kroah-Hartman
2021-08-24 10:53 ` [RFC PATCH 5/5] xhci-pci: Use flag to not register roothub while adding primary HCD Kishon Vijay Abraham I

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=bb64fbf9-4342-7d36-de4f-0ab719b8f479@ti.com \
    --to=kishon@ti.com \
    --cc=chris.chiu@canonical.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-usb@vger.kernel.org \
    --cc=mathias.nyman@intel.com \
    --cc=stern@rowland.harvard.edu \
    --subject='Re: [RFC PATCH 1/5] usb: core: hcd: Modularize HCD stop configuration in usb_stop_hcd()' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).