From: Christoph Hellwig <hch@lst.de>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Christoph Hellwig <hch@lst.de>, Oliver Neukum <oneukum@suse.com>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>
Subject: Re: How to resolve an issue in swiotlb environment?
Date: Thu, 13 Jun 2019 09:39:00 +0200 [thread overview]
Message-ID: <20190613073900.GC12093@lst.de> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1906121038210.1557-100000@iolanthe.rowland.org>
On Wed, Jun 12, 2019 at 10:43:11AM -0400, Alan Stern wrote:
> Would it be okay to rely on the assumption that USB block devices never
> have block size < 512? (We could even add code to the driver to
> enforce this, although refusing to handle such devices at all might be
> worse than getting an occasional error.)
sd.c only supports a few specific sector size, and none of them is
< 512 bytes:
if (sector_size != 512 &&
sector_size != 1024 &&
sector_size != 2048 &&
sector_size != 4096) {
...
sdkp->capacity = 0;
next prev parent reply other threads:[~2019-06-13 16:35 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-03 6:42 How to resolve an issue in swiotlb environment? Yoshihiro Shimoda
2019-06-07 12:00 ` Yoshihiro Shimoda
2019-06-10 7:31 ` Biju Das
2019-06-10 11:13 ` Yoshihiro Shimoda
2019-06-10 12:32 ` Christoph Hellwig
2019-06-10 18:46 ` Alan Stern
2019-06-11 6:41 ` Christoph Hellwig
2019-06-11 14:51 ` Alan Stern
2019-06-12 7:30 ` Christoph Hellwig
2019-06-12 8:52 ` Yoshihiro Shimoda
2019-06-12 11:31 ` Christoph Hellwig
2019-06-13 4:52 ` Yoshihiro Shimoda
2019-06-12 11:46 ` Oliver Neukum
2019-06-12 12:06 ` Christoph Hellwig
2019-06-12 14:43 ` Alan Stern
2019-06-13 7:39 ` Christoph Hellwig [this message]
2019-06-13 16:57 ` Martin K. Petersen
2019-06-13 17:16 ` Alan Stern
2019-06-13 18:18 ` Greg KH
2019-06-13 23:01 ` shuah
2019-06-14 14:44 ` Alan Stern
2019-06-18 15:28 ` shuah
2019-06-19 20:23 ` shuah
2019-06-19 21:05 ` Alan Stern
2019-06-21 17:43 ` Suwan Kim
2019-06-11 6:49 ` Yoshihiro Shimoda
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