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linux/Documentation/ABI/testing/sysfs-driver-st

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st: allow debug output to be enabled or disabled via sysfs Change st driver to allow enabling or disabling debug output via sysfs file /sys/bus/scsi/drivers/st/debug_flag. Previously the only way to enable debug output was: 1. loading the driver with the module parameter debug_flag=1 2. an ioctl call (this method was also the only way to dynamically disable debug output). To use the ioctl you need a second tape drive (if you are actively testing the first tape drive) since a second process cannot open the first tape drive if it is in use. The this change is only functional if the value of the macro DEBUG in st.c is a non-zero value (which it is by default). Signed-off-by: Shane Seymour <shane.seymour@hpe.com> Reviewed-by: Laurence Oberman <oberman.l@gmail.com> Acked-by: Kai Mäkisara <kai.makisara@kolumbus.fi> Signed-off-by: James Bottomley <JBottomley@Odin.com>
2015-10-12 12:31:17 +08:00
What: /sys/bus/scsi/drivers/st/debug_flag
Date: October 2015
Kernel Version: ?.?
Contact: shane.seymour@hpe.com
Description:
This file allows you to turn debug output from the st driver
off if you write a '0' to the file or on if you write a '1'.
Note that debug output requires that the module be compiled
with the #define DEBUG set to a non-zero value (this is the
default). If DEBUG is set to 0 then this file will not
appear in sysfs as its presence is conditional upon debug
output support being compiled into the module.