lkml.org 
[lkml]   [2020]   [Feb]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] usb: hub: Fix unhandled return value of usb_autopm_get_interface()
On Tue, 25 Feb 2020, Eugeniu Rosca wrote:

> Hi Alan,
>
> On Tue, Feb 25, 2020 at 02:39:23PM -0500, Alan Stern wrote:
> > On Tue, 25 Feb 2020, Eugeniu Rosca wrote:
> > > [1] (v5.6-rc3) git grep -En "[^=]\s+usb_autopm_get_interface\("
> > > drivers/input/touchscreen/usbtouchscreen.c:1788: usb_autopm_get_interface(intf);
> > > drivers/media/usb/stkwebcam/stk-webcam.c:628: usb_autopm_get_interface(dev->interface);
> > > drivers/net/usb/hso.c:1308: usb_autopm_get_interface(serial->parent->interface);
> > > drivers/net/usb/r8152.c:5231: usb_autopm_get_interface(tp->intf);
> > > sound/usb/usx2y/us122l.c:192: usb_autopm_get_interface(iface);
> >
> > Your regular expression isn't right because it doesn't match lines
> > where the usb_autopm_get_interface() is preceded only by one whitespace
> > character (i.e., a tab). It also will match lines where there are two
> > space characters between the = sign and the function name. I think
> > what you want is more like "(^|[^=[:space:]])\s*" at the start of the
> > RE.
>
> Agreed. My version filters out some true positives.
>
> >
> > A revised search finds line 997 in drivers/usb/core/hub.c and lines
> > 216, 269 in drivers/usb/core/port.c. (I didn't try looking in any
> > other directories.) AFAICT all three of these should check the return
> > value, although a error message in the kernel log probably isn't
> > needed.
> >
> > Do you want to fix those instances up also, maybe merging them in with
> > the existing patch?
>
> I wonder if squashing all these fixes into one patch is the best option.
>
> There are three commits fixed by the proposed changes in usb core:
> - v5.6-rc3 commit 1208f9e1d758c9 ("USB: hub: Fix the broken detection of USB3 device in SMSC hub")
> - v3.9-rc1 commit 971fcd492cebf5 ("usb: add runtime pm support for usb port device")
> - v2.6.33-rc1 commit 253e05724f9230 ("USB: add a "remove hardware" sysfs attribute")
>
> I assume a single fix will create some pain when applying it to the
> stable branches. Do you have any preference/inputs about that?

If you prefer to split this up into multiple patches, that's fine with
me.

Alan Stern

\
 
 \ /
  Last update: 2020-02-25 21:55    [W:0.170 / U:0.324 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site