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d9b43a10f0
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>
12 lines
543 B
Text
12 lines
543 B
Text
What: /sys/bus/scsi/drivers/st/debug_flag
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Date: October 2015
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Kernel Version: ?.?
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Contact: shane.seymour@hpe.com
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Description:
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This file allows you to turn debug output from the st driver
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off if you write a '0' to the file or on if you write a '1'.
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Note that debug output requires that the module be compiled
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with the #define DEBUG set to a non-zero value (this is the
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default). If DEBUG is set to 0 then this file will not
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appear in sysfs as its presence is conditional upon debug
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output support being compiled into the module.
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