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* [PATCH v2 05/30] cxlflash: Fix data corruption when vLUN used over multiple cards
@ 2015-09-16 16:53 Matthew R. Ochs
  0 siblings, 0 replies; 3+ messages in thread
From: Matthew R. Ochs @ 2015-09-16 16:53 UTC (permalink / raw)
  To: linux-scsi, James.Bottomley, nab, brking, imunsie, dja,
	andrew.donnellan
  Cc: mikey, linuxppc-dev, Manoj N. Kumar

If the same virtual LUN is accessed over multiple cards, only accesses
made over the first card will be valid. Accesses made over the second
card will go to the wrong LUN causing data corruption.

This is because the global LUN's mode word was being used to determine
whether the LUN table for that card needs to be programmed. The mode
word would be setup by the first card, causing the LUN table for the
second card to not be programmed.

By unconditionally initializing the LUN table (not depending on the
mode word), the problem is avoided.

Signed-off-by: Matthew R. Ochs <mrochs@linux.vnet.ibm.com>
Signed-off-by: Manoj N. Kumar <manoj@linux.vnet.ibm.com>
---
 drivers/scsi/cxlflash/vlun.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/cxlflash/vlun.c b/drivers/scsi/cxlflash/vlun.c
index 68994c4..96b074f 100644
--- a/drivers/scsi/cxlflash/vlun.c
+++ b/drivers/scsi/cxlflash/vlun.c
@@ -915,16 +915,9 @@ int cxlflash_disk_virtual_open(struct scsi_device *sdev, void *arg)
 
 	pr_debug("%s: ctxid=%llu ls=0x%llx\n", __func__, ctxid, lun_size);
 
+	/* Setup the LUNs block allocator on first call */
 	mutex_lock(&gli->mutex);
 	if (gli->mode == MODE_NONE) {
-		/* Setup the LUN table and block allocator on first call */
-		rc = init_luntable(cfg, lli);
-		if (rc) {
-			dev_err(dev, "%s: call to init_luntable failed "
-				"rc=%d!\n", __func__, rc);
-			goto err0;
-		}
-
 		rc = init_vlun(lli);
 		if (rc) {
 			dev_err(dev, "%s: call to init_vlun failed rc=%d!\n",
@@ -942,6 +935,13 @@ int cxlflash_disk_virtual_open(struct scsi_device *sdev, void *arg)
 	}
 	mutex_unlock(&gli->mutex);
 
+	rc = init_luntable(cfg, lli);
+	if (rc) {
+		dev_err(dev, "%s: call to init_luntable failed rc=%d!\n",
+			__func__, rc);
+		goto err1;
+	}
+
 	ctxi = get_context(cfg, rctxid, lli, 0);
 	if (unlikely(!ctxi)) {
 		dev_err(dev, "%s: Bad context! (%llu)\n", __func__, ctxid);
-- 
2.1.0

^ permalink raw reply related	[flat|nested] 3+ messages in thread
* [PATCH v2 00/30] cxlflash: Miscellaneous bug fixes and corrections
@ 2015-09-16 21:23 Matthew R. Ochs
  2015-09-16 21:27 ` [PATCH v2 05/30] cxlflash: Fix data corruption when vLUN used over multiple cards Matthew R. Ochs
  0 siblings, 1 reply; 3+ messages in thread
From: Matthew R. Ochs @ 2015-09-16 21:23 UTC (permalink / raw)
  To: linux-scsi, James Bottomley, Nicholas A. Bellinger, Brian King,
	Ian Munsie, Daniel Axtens, Andrew Donnellan
  Cc: Michael Neuling, linuxppc-dev

This patch set contains various fixes and corrections for issues that
were found during test and code review. The series is based upon the
code upstreamed in 4.3 and is intended for the rc phase. The entire
set is bisectable. Please reference the changelog below for details
on what has been altered from previous versions of this patch set.

v2 Changes:
- Incorporate comments from Ian Munsie
- Rework commit messages to be more descriptive
- Add state change serialization patch

Manoj Kumar (3):
  cxlflash: Fix to avoid invalid port_sel value
  cxlflash: Replace magic numbers with literals
  cxlflash: Fix read capacity timeout

Matthew R. Ochs (27):
  cxlflash: Fix potential oops following LUN removal
  cxlflash: Fix data corruption when vLUN used over multiple cards
  cxlflash: Fix to avoid sizeof(bool)
  cxlflash: Fix context encode mask width
  cxlflash: Fix to avoid CXL services during EEH
  cxlflash: Check for removal when processing interrupt
  cxlflash: Correct naming of limbo state and waitq
  cxlflash: Make functions static
  cxlflash: Refine host/device attributes
  cxlflash: Fix to avoid spamming the kernel log
  cxlflash: Fix to avoid stall while waiting on TMF
  cxlflash: Fix location of setting resid
  cxlflash: Fix host link up event handling
  cxlflash: Fix async interrupt bypass logic
  cxlflash: Remove dual port online dependency
  cxlflash: Fix AFU version access/storage and add check
  cxlflash: Correct usage of scsi_host_put()
  cxlflash: Fix to prevent workq from accessing freed memory
  cxlflash: Correct behavior in device reset handler following EEH
  cxlflash: Remove unnecessary scsi_block_requests
  cxlflash: Fix function prolog parameters and return codes
  cxlflash: Fix MMIO and endianness errors
  cxlflash: Fix to prevent EEH recovery failure
  cxlflash: Correct spelling, grammar, and alignment mistakes
  cxlflash: Fix to prevent stale AFU RRQ
  cxlflash: Fix to avoid state change collision
  MAINTAINERS: Add cxlflash driver

 MAINTAINERS                       |    9 +
 drivers/scsi/cxlflash/common.h    |   29 +-
 drivers/scsi/cxlflash/lunmgt.c    |    9 +-
 drivers/scsi/cxlflash/main.c      | 1575 ++++++++++++++++++++-----------------
 drivers/scsi/cxlflash/main.h      |    1 +
 drivers/scsi/cxlflash/sislite.h   |    8 +-
 drivers/scsi/cxlflash/superpipe.c |  177 +++--
 drivers/scsi/cxlflash/superpipe.h |   11 +-
 drivers/scsi/cxlflash/vlun.c      |   39 +-
 9 files changed, 1036 insertions(+), 822 deletions(-)

-- 
2.1.0

^ permalink raw reply	[flat|nested] 3+ messages in thread
end of thread, other threads:[~2015-09-18  1:28 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz follow: Atom feed
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2015-09-16 16:53 [PATCH v2 05/30] cxlflash: Fix data corruption when vLUN used over multiple cards Matthew R. Ochs
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2015-09-16 21:23 [PATCH v2 00/30] cxlflash: Miscellaneous bug fixes and corrections Matthew R. Ochs
2015-09-16 21:27 ` [PATCH v2 05/30] cxlflash: Fix data corruption when vLUN used over multiple cards Matthew R. Ochs
2015-09-18  1:28   ` Brian King

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