There's no need to wait for disk spin-up for USB SSD devices. This
patch allow the SSD to skip waiting disk spin-up by passing sd_mod.ssd=1
during boot-up.
If there's a better way to handle this, please share.
Thanks,
Jeff
--- linux/drivers/scsi/sd.c 2015-05-25 07:29:44.000000000 +0800
+++ linux/drivers/scsi/sd.c 2015-06-19 22:17:35.000000000 +0800
@@ -92,6 +92,9 @@
MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
+static int ssd = 0;
+module_param(ssd, int, 0);
+
#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
#define SD_MINORS 16
#else
@@ -2738,7 +2741,9 @@
goto out;
}
- sd_spinup_disk(sdkp);
+ sd_printk(KERN_NOTICE, sdkp, "ssd %s\n", ssd == 0 ? "off" : "on");
+ if(!ssd)
+ sd_spinup_disk(sdkp);
/*
* Without media there is no reason to ask; moreover, some devices
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