[PATCH] nvme: don't apply NVME_QUIRK_DEALLOCATE_ZEROES when DSM is not supported

[Christoph Hellwig]

Commit 63dfa1004322 ("nvme: move NVME_QUIRK_DEALLOCATE_ZEROES out of
nvme_config_discard") started applying the NVME_QUIRK_DEALLOCATE_ZEROES
quirk even then the Dataset Management is not supported.  It turns out
that there versions of these old Intel SSDs that have DSM support
disabled in the firmware, which will now lead to errors everytime
a Write Zeroes command is issued.  Fix this by checking for DSM support
before applying the quirk.

Reported-by: Saeed Mirzamohammadi <saeed.mirzamohammadi at oracle.com>
Fixes: 63dfa1004322 ("nvme: move NVME_QUIRK_DEALLOCATE_ZEROES out of nvme_config_discard")
Tested-by: Saeed Mirzamohammadi <saeed.mirzamohammadi at oracle.com>
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/nvme/host/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index bfd71511c85f..5e5c9e15ad0c 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2043,7 +2043,8 @@ static bool nvme_update_disk_info(struct nvme_ns *ns, struct nvme_id_ns *id,
 	lim->physical_block_size = min(phys_bs, atomic_bs);
 	lim->io_min = phys_bs;
 	lim->io_opt = io_opt;
-	if (ns->ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES)
+	if ((ns->ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES) &&
+	    (ns->ctrl->oncs & NVME_CTRL_ONCS_DSM))
 		lim->max_write_zeroes_sectors = UINT_MAX;
 	else
 		lim->max_write_zeroes_sectors = ns->ctrl->max_zeroes_sectors;
-- 
2.45.2