NVMe: Make I/O timeout a module parameter

Increase the default timeout to 30 seconds to match SCSI.

Signed-off-by: Keith Busch <keith.busch@intel.com>
[use byte instead of ushort]
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>

2 files changed, 6 insertions, 1 deletions

diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index ce5a4f1a3950..7c57b1d955a1 100644
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -50,6 +50,10 @@
 #define CQ_SIZE(depth)          (depth * sizeof(struct nvme_completion))
 #define ADMIN_TIMEOUT   (60 * HZ)
 
+unsigned char io_timeout = 30;
+module_param(io_timeout, byte, 0644);
+MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O");
+
 static int nvme_major;
 module_param(nvme_major, int, 0);
 
diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index 15d071eba8b8..1da0807c65bc 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -66,7 +66,8 @@ enum {
 
 #define NVME_VS(major, minor)   (major << 16 | minor)
 
-#define NVME_IO_TIMEOUT (5 * HZ)
+extern unsigned char io_timeout;
+#define NVME_IO_TIMEOUT (io_timeout * HZ)
 
 /*
  * Represents an NVM Express device.  Each nvme_dev is a PCI function.