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| author | Martin K. Petersen <martin.petersen@oracle.com> | 2015-06-23 12:13:59 -0400 |
|---|---|---|
| committer | James Bottomley <JBottomley@Odin.com> | 2015-08-12 11:54:37 -0700 |
| commit | 4f258a46346c03fa0bbb6199ffaf4e1f9f599660 (patch) | |
| tree | 87f6203edaaa3e9156c5f1710427a1915195e98e /block | |
| parent | 8f2777f53e3d5ad8ef2a176a4463a5c8e1a16431 (diff) | |
| download | linux-4f258a46346c03fa0bbb6199ffaf4e1f9f599660.tar.gz linux-4f258a46346c03fa0bbb6199ffaf4e1f9f599660.tar.bz2 linux-4f258a46346c03fa0bbb6199ffaf4e1f9f599660.zip | |
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>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-settings.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/block/blk-settings.c b/block/blk-settings.c index 12600bfffca9..e0057d035200 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -241,8 +241,8 @@ EXPORT_SYMBOL(blk_queue_bounce_limit); * Description: * Enables a low level driver to set a hard upper limit, * max_hw_sectors, on the size of requests. max_hw_sectors is set by - * the device driver based upon the combined capabilities of I/O - * controller and storage device. + * the device driver based upon the capabilities of the I/O + * controller. * * max_sectors is a soft limit imposed by the block layer for * filesystem type requests. This value can be overridden on a |