Re: [PATCH] misc: fastrpc: fix improper packet size calculation

[jeyr]

On 2021-09-20 14:38, Greg KH wrote:
> On Mon, Sep 20, 2021 at 01:45:31PM +0530, Jeya R wrote:
> > The buffer list is sorted and this is not being
> > considered while calculating packet size. This
> > would lead to improper copy length calculation
> > for non-dmaheap buffers which would eventually
> > cause sending improper buffers to DSP.
>
> You do have the full 72 columns to use :)

Thanks, will update the commit message considering this.

> > Signed-off-by: Jeya R <jeyr@xxxxxxxxxxxxxx>
> > ---
> >  drivers/misc/fastrpc.c | 13 +++++++++----
> >  1 file changed, 9 insertions(+), 4 deletions(-)
>
> What commit does this fix?
>
> thanks,
>
> greg k-h

Payload calculation function was modified to handle buffer overlapping 
calculation in this commit:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/misc/fastrpc.c?h=v5.15-rc2&id=25e8dfb83cda0a123bb1e091d6c3599cde050d76

Here during buffer overlap calculation, the buffer list is getting 
sorted. This needs to be considered during the calculation of payload 
size also by using unsorted buffer index "raix".