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authorKeith Busch <keith.busch@intel.com>2018-06-06 17:13:09 +0300
committerJens Axboe <axboe@kernel.dk>2018-06-08 21:51:11 +0300
commit69f4eb9ff79556c1a3daf5af5573594c196f30cc (patch)
treec97bc3aac6cc5be8414f7a1e53190505ab22d75c /drivers/nvme
parent1d39e6928cbd0eb737c51545210b5186d5551ba1 (diff)
downloadlinux-69f4eb9ff79556c1a3daf5af5573594c196f30cc.tar.xz
nvme-pci: make CMB SQ mod-param read-only
A controller reset after a run time change of the CMB module parameter breaks the driver. An 'on -> off' will have the driver use NULL for the host memory queue, and 'off -> on' will use mismatched queue depth between the device and the host. We could fix both, but there isn't really a good reason to change this at run time anyway, compared to at module load time, so this patch makes parameter read-only after after modprobe. Signed-off-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/nvme')
-rw-r--r--drivers/nvme/host/pci.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index d935aba0288f..cd7aec58a301 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -42,7 +42,7 @@ static int use_threaded_interrupts;
module_param(use_threaded_interrupts, int, 0);
static bool use_cmb_sqes = true;
-module_param(use_cmb_sqes, bool, 0644);
+module_param(use_cmb_sqes, bool, 0444);
MODULE_PARM_DESC(use_cmb_sqes, "use controller's memory buffer for I/O SQes");
static unsigned int max_host_mem_size_mb = 128;