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authorMatias Bjørling <m@bjorling.me>2016-11-10 12:26:57 +0100
committerJens Axboe <axboe@fb.com>2016-11-11 18:27:32 -0700
commit409ae5a76e0505c8ffe1424f9c00dbf2ec7b5eea (patch)
tree48c5e6f4ce025fad785016a2087c0f671d61003b
parent86e4ee760ef2f7571e233a3abf065ffd0bb4089d (diff)
downloadlinux-sh-409ae5a76e0505c8ffe1424f9c00dbf2ec7b5eea.tar.gz
lightnvm: invalid offset calculation for lba_shift
The ns->lba_shift assumes its value to be the logarithmic of the LA size. A previous patch duplicated the lba_shift calculation into lightnvm. It prematurely also subtracted a 512byte shift, which commonly is applied per-command. The 512byte shift being subtracted twice led to data loss when restoring the logical to physical mapping table from device and when issuing I/O commands using rrpc. Fix offset by removing the 512byte shift subtraction when calculating lba_shift. Fixes: b0b4e09c1ae7 "lightnvm: control life of nvm_dev in driver" Reported-by: Javier González <javier@cnexlabs.com> Signed-off-by: Matias Bjørling <m@bjorling.me> Signed-off-by: Jens Axboe <axboe@fb.com>
-rw-r--r--drivers/nvme/host/lightnvm.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
index f5e3011e31fc..5daf2f4be0cd 100644
--- a/drivers/nvme/host/lightnvm.c
+++ b/drivers/nvme/host/lightnvm.c
@@ -612,7 +612,7 @@ int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node,
ret = nvm_register(dev);
- ns->lba_shift = ilog2(dev->sec_size) - 9;
+ ns->lba_shift = ilog2(dev->sec_size);
if (sysfs_create_group(&dev->dev.kobj, attrs))
pr_warn("%s: failed to create sysfs group for identification\n",