[PATCH 1/2] nvme-pci: fix early boot hang with nvme.quirks parameter

[Maurizio Lombardi]

Passing nvme.quirks on the kernel command line causes a silent boot
hang when the NVMe driver is compiled as a built-in module.

This happens because the parameter is currently registered using
module_param_cb(). For built-in modules, this macro flags the parameter
to be evaluated at initcall level -1. Consequently, quirks_param_set() is
called before the memory allocators are initialized.

Fix this by replacing module_param_cb() with device_param_cb(). This
defers the parameter parsing to initcall level 6, guaranteeing that
the system memory allocators are fully functional before the quirk
string is parsed and allocated.

Fixes: 7bb8c40f5ad8 ("nvme: add support for dynamic quirk configuration via module parameter")
Signed-off-by: Maurizio Lombardi <mlombard at redhat.com>
---
 drivers/nvme/host/pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 77317e5d00f9..6699c7da4b5a 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -243,7 +243,7 @@ static struct kparam_string quirks_param_string = {
 	.string = quirks_param,
 };
 
-module_param_cb(quirks, &quirks_param_ops, &quirks_param_string, 0444);
+device_param_cb(quirks, &quirks_param_ops, &quirks_param_string, 0444);
 MODULE_PARM_DESC(quirks, "Enable/disable NVMe quirks by specifying "
 						"quirks=VID:DID:quirk_names");
 
-- 
2.56.0