lkml.org 
[lkml]   [2019]   [Dec]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 4.19 240/321] mmc: core: align max segment size with logical block size
Hi!

> From: Ming Lei <ming.lei@redhat.com>
>
> [ Upstream commit c53336c8f5f29043fded57912cc06c24e12613d7 ]
>
> Logical block size is the lowest possible block size that the storage
> device can address. Max segment size is often related with controller's
> DMA capability. And it is reasonable to align max segment size with
> logical block size.

> SDHCI sets un-aligned max segment size, and causes ADMA error, so
> fix it by aligning max segment size with logical block size.

If un-aligned max segment sizes are problem, should we add checks to
prevent setting them?

At least these set unaligned problems; is that a problem?

drivers/block/nbd.c: blk_queue_max_segment_size(disk->queue, UINT_MAX);
drivers/block/virtio_blk.c: blk_queue_max_segment_size(q, -1U);
drivers/block/rbd.c: blk_queue_max_segment_size(q, UINT_MAX);

Best regards,
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2019-12-05 23:23    [W:1.050 / U:0.928 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site