[PATCH v2 05/30] cxlflash: Fix data corruption when vLUN used over multiple cards
From: Matthew R. Ochs <hidden>
Date: 2015-09-16 21:28:15
Also in:
linux-scsi
Subsystem:
scsi subsystem, the rest · Maintainers:
"James E.J. Bottomley", "Martin K. Petersen", Linus Torvalds
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 <redacted> Signed-off-by: Manoj N. Kumar <redacted> --- 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