The patch titled
fix for bugzilla 8426: massive slowdown on SCSI CD/DVD drive connected to mptspi driver
has been added to the -mm tree. Its filename is
fix-for-bugzilla-8426-massive-slowdown-on-scsi-cd-dvd-drive-connected-to-mptspi-driver.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: fix for bugzilla 8426: massive slowdown on SCSI CD/DVD drive connected to mptspi driver
From: Doug Chapman <doug.chapman@xxxxxx>
Patch for: http://bugzilla.kernel.org/show_bug.cgi?id=8426
A recent code cleanup that moved code from mptscsih to mptspi inadvertently
change the order some code was called. This caused a massive slowdown (of
150x to 300x) on the CD/DVD drive on the high-end HP Integrity servers.
Signed-off-by: Doug Chapman <doug.chapman@xxxxxx>
Cc: "Moore, Eric Dean" <Eric.Moore@xxxxxxxx>
Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/message/fusion/mptspi.c | 8 +++++---
1 files changed, 5 insertions(+), 3 deletions(-)
diff -puN drivers/message/fusion/mptspi.c~fix-for-bugzilla-8426-massive-slowdown-on-scsi-cd-dvd-drive-connected-to-mptspi-driver drivers/message/fusion/mptspi.c
--- a/drivers/message/fusion/mptspi.c~fix-for-bugzilla-8426-massive-slowdown-on-scsi-cd-dvd-drive-connected-to-mptspi-driver
+++ a/drivers/message/fusion/mptspi.c
@@ -727,13 +727,15 @@ static int mptspi_slave_configure(struct
struct _MPT_SCSI_HOST *hd =
(struct _MPT_SCSI_HOST *)sdev->host->hostdata;
VirtTarget *vtarget = scsi_target(sdev)->hostdata;
- int ret = mptscsih_slave_configure(sdev);
+ int ret;
+
+ mptspi_initTarget(hd, vtarget, sdev);
+
+ ret = mptscsih_slave_configure(sdev);
if (ret)
return ret;
- mptspi_initTarget(hd, vtarget, sdev);
-
ddvprintk((MYIOC_s_INFO_FMT "id=%d min_period=0x%02x"
" max_offset=0x%02x max_width=%d\n", hd->ioc->name,
sdev->id, spi_min_period(scsi_target(sdev)),
_
Patches currently in -mm which might be from doug.chapman@xxxxxx are
fix-for-bugzilla-8426-massive-slowdown-on-scsi-cd-dvd-drive-connected-to-mptspi-driver.patch
-
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