Re: Problem with SPCC 256GB NVMe 1.3 drive - refcount_t: underflow; use-after-free.

[Chaitanya Kulkarni <Chaitanya.Kulkarni@wdc.com>]

On 1/21/21 6:57 PM, Chaitanya Kulkarni wrote:
> Bradley,
>
> On 1/21/21 6:54 PM, Bradley Chapman wrote:
>> I compiled the kernel from the above git tree, rebooted and attempted to 
>> mount the filesystem on the NVMe drive. This is what the kernel put into 
>> the dmesg when I attempted to list the contents of the filesystem root, 
>> create an inode for a zero-byte file and then unmount the filesystem.
>>
>> Brad
> Did you get a chance to see my response to your previous email ?
>
You can try following patch with some modification :-

From e162a2e91e4895ceac6f80042a87c4ba6a4fbbf5 Mon Sep 17 00:00:00 2001
From: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Date: Thu, 21 Jan 2021 19:05:13 -0800
Subject: [PATCH] nvme-pci: add device quirk wip

This is work in progress patch which is based on nvme-5.12
HEAD : b116d37fc0f5 nvmet: add lba to sect conversion helpers

Replace <YOUR DEVICE'S VENDOR ID> and <YOUR DEVICE's DEVICE ID> with
actual values sysfs entries in patch below before you apply the patch :-

cat  /sys/bus/pci/devices/<your device id>/device
cat  /sys/bus/pci/devices/<your device id>/vendor

This patch is not tested at all.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
---
 drivers/nvme/host/pci.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 25456d02eddb..c5b43bcf57b0 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -3228,6 +3228,8 @@ static const struct pci_device_id nvme_id_table[] = {
         .driver_data = NVME_QUIRK_DISABLE_WRITE_ZEROES, },
     { PCI_DEVICE(0x15b7, 0x2001),   /*  Sandisk Skyhawk */
         .driver_data = NVME_QUIRK_DISABLE_WRITE_ZEROES, },
+    { PCI_DEVICE(<YOUR DEVICE's VENDOR ID>, <YOUR DEVICE's DEVICE ID>),
+        .driver_data = NVME_QUIRK_DISABLE_WRITE_ZEROES, },
     { PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2001),
         .driver_data = NVME_QUIRK_SINGLE_VECTOR },
     { PCI_DEVICE(PCI_VENDOR_ID_APPLE, 0x2003) },
-- 
2.22.1




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