lkml.org 
[lkml]   [2018]   [Jul]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] tpm: add support for partial reads
On Mon, Jul 23, 2018 at 04:42:38PM -0700, Tadeusz Struk wrote:
> On 07/23/2018 03:08 PM, Jason Gunthorpe wrote:
> > On Mon, Jul 23, 2018 at 03:00:20PM -0700, Tadeusz Struk wrote:
> >> On 07/23/2018 02:56 PM, Jason Gunthorpe wrote:
> >>> The proposed patch doesn't clear the data_pending if the entire buffer
> >>> is not consumed, so of course it is ABI breaking, that really isn't OK.
> >> The data_pending will be cleared by the timeout handler if the user doesn't
> >> read the response fully before the timeout expires. The is the same situation
> >> if the user would not read the response at all.
> > That causes write() to fail with EBUSY
> >
> > NAK from me on breaking the ABI like this
>
> What if we introduce this new behavior only for the non-blocking mode
> as James suggested? Or do you have some other suggestions?

I think you should do it entirely in userspace.

But something sensible linked to O_NONBLOCK could be OK.

Jason

\
 
 \ /
  Last update: 2018-07-24 04:07    [W:0.077 / U:1.356 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site