From: Martin K. Petersen <martin.petersen@oracle.com>
Date: Tue, 23 Jun 2015 16:13:59 +0000 (-0400)
Subject: sd: Fix maximum I/O size for BLOCK_PC requests
X-Git-Tag: omap-for-v4.3/fixes-merge-window~93^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4f258a46346c03fa0bbb6199ffaf4e1f9f599660;p=pandora-kernel.git

sd: Fix maximum I/O size for BLOCK_PC requests

Commit bcdb247c6b6a ("sd: Limit transfer length") clamped the maximum
size of an I/O request to the MAXIMUM TRANSFER LENGTH field in the BLOCK
LIMITS VPD. This had the unfortunate effect of also limiting the maximum
size of non-filesystem requests sent to the device through sg/bsg.

Avoid using blk_queue_max_hw_sectors() and set the max_sectors queue
limit directly.

Also update the comment in blk_limits_max_hw_sectors() to clarify that
max_hw_sectors defines the limit for the I/O controller only.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Reported-by: Brian King <brking@linux.vnet.ibm.com>
Tested-by: Brian King <brking@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org # 3.17+
Signed-off-by: James Bottomley <JBottomley@Odin.com>
---

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