Commit 21db1882 authored by Matthew Wilcox's avatar Matthew Wilcox Committed by James Bottomley
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[SCSI] Add Kconfig option for asynchronous SCSI scanning

Without this patch, the user has to add a kernel command line parameter
to get asynchronous SCSI scanning.  Now they can select the default at
compile time and still override it at boot time if they need to.

Signed-off-by: default avatarMatthew Wilcox <>
Signed-off-by: default avatarJames Bottomley <>
parent 90276283
......@@ -216,6 +216,23 @@ config SCSI_LOGGING
there should be no noticeable performance impact as long as you have
logging turned off.
bool "Asynchronous SCSI scanning"
depends on SCSI
The SCSI subsystem can probe for devices while the rest of the
system continues booting, and even probe devices on different
busses in parallel, leading to a significant speed-up.
If you have built SCSI as modules, enabling this option can
be a problem as the devices may not have been found by the
time your system expects them to have been. You can load the
scsi_wait_scan module to ensure that all scans have completed.
If you build your SCSI drivers into the kernel, then everything
will work fine if you say Y here.
You can override this choice by specifying scsi_mod.scan="sync"
or "async" on the kernel's command line.
menu "SCSI Transports"
depends on SCSI
......@@ -89,7 +89,13 @@ module_param_named(max_luns, max_scsi_luns, int, S_IRUGO|S_IWUSR);
"last scsi LUN (should be between 1 and 2^32-1)");
static char scsi_scan_type[6] = "sync";
#define SCSI_SCAN_TYPE_DEFAULT "async"
static char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT;
module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO);
MODULE_PARM_DESC(scan, "sync, async or none");
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