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Seymour, Shane M d9b43a10f0 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>
 		2015-11-09 17:17:27 -08:00
..
scsi_transport_srp scsi_transport_srp: Add rport state diagram 2014-01-21 10:46:17 -08:00
00-INDEX Documentation/: update 00-INDEX files 2014-02-10 16:01:40 -08:00
53c700.txt Doc: 53c700: drop never defined (Kconfig) macros 2011-11-08 10:24:15 +01:00
BusLogic.txt doc: fix wrong arch/i386 references 2011-06-13 13:43:05 +02:00
ChangeLog.1992-1997
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ChangeLog.arcmsr
…
ChangeLog.ips
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ChangeLog.lpfc Documentation: Fix multiple typo in Documentation 2012-03-07 16:08:24 +01:00
ChangeLog.megaraid Fix common misspellings 2011-03-31 11:26:23 -03:00
ChangeLog.megaraid_sas megaraid_sas: Version and Changelog update 2014-09-16 09:09:54 -07:00
ChangeLog.ncr53c8xx Fix common misspellings 2011-03-31 11:26:23 -03:00
ChangeLog.sym53c8xx Fix common misspellings 2011-03-31 11:26:23 -03:00
ChangeLog.sym53c8xx_2
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FlashPoint.txt Documentation: update broken web addresses. 2010-08-04 15:21:40 +02:00
LICENSE.FlashPoint
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LICENSE.qla2xxx qla2xxx: Change copyright year to 2014 in all the source files. 2014-05-19 13:31:02 +02:00
LICENSE.qla4xxx [SCSI] qla4xxx: Update Copyright header 2013-09-03 07:27:54 -07:00
Mylex.txt Documentation: update broken web addresses. 2010-08-04 15:21:40 +02:00
NinjaSCSI.txt Documentation: update broken web addresses. 2010-08-04 15:21:40 +02:00
aacraid.txt
…
advansys.txt
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aha152x.txt Fix common misspellings 2011-03-31 11:26:23 -03:00
aic7xxx.txt Documentation: remove references to /etc/modprobe.conf 2012-03-30 16:03:15 -07:00
aic79xx.txt Documentation: remove references to /etc/modprobe.conf 2012-03-30 16:03:15 -07:00
arcmsr_spec.txt
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bfa.txt [SCSI] bfa: add readme file 2012-02-19 08:09:01 -06:00
bnx2fc.txt [SCSI] bnx2fc: Add driver documentation 2011-09-22 15:10:59 +04:00
cxgb3i.txt
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dc395x.txt
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dpti.txt
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dtc3x80.txt Documentation/: it's -> its where appropriate 2010-04-23 02:09:52 +02:00
g_NCR5380.txt
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hpsa.txt [SCSI] hpsa: export resettable host attribute 2011-03-14 18:44:41 -05:00
hptiop.txt Documentation/scsi/hptiop.txt fix a typo 2013-08-20 12:41:12 +02:00
in2000.txt
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libsas.txt libsas: remove task_collector mode 2014-11-27 16:40:24 +01:00
link_power_management_policy.txt
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lpfc.txt
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megaraid.txt
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ncr53c8xx.txt genirq: Remove the deprecated 'IRQF_DISABLED' request_irq() flag entirely 2015-03-05 20:53:06 +01:00
osd.txt Boaz Harrosh - fix email in Documentation 2014-10-19 20:36:36 +03:00
osst.txt Documentation: remove references to /etc/modprobe.conf 2012-03-30 16:03:15 -07:00
ppa.txt Documentation: update broken web addresses. 2010-08-04 15:21:40 +02:00
qlogicfas.txt
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scsi-changer.txt Fix common misspellings 2011-03-31 11:26:23 -03:00
scsi-generic.txt Documentation: Fix Broken URL "freshmeat" 2012-02-21 11:43:45 +01:00
scsi-parameters.txt scsi: delete the MCA specific drivers and driver code 2012-05-17 19:03:54 -04:00
scsi.txt Documentation: update broken web addresses. 2010-08-04 15:21:40 +02:00
scsi_eh.txt scsi: Fix "choir" and "beeing" malaprops 2014-10-29 14:33:46 +01:00
scsi_fc_transport.txt Fix common misspellings 2011-03-31 11:26:23 -03:00
scsi_mid_low_api.txt Merge branch 'for-4.2/sg' of git://git.kernel.dk/linux-block 2015-06-25 15:22:36 -07:00
st.txt st: allow debug output to be enabled or disabled via sysfs 2015-11-09 17:17:27 -08:00
sym53c8xx_2.txt Documentation: fix minor typos/spelling 2011-04-04 17:51:47 -07:00
sym53c500_cs.txt
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tmscsim.txt genirq: Remove the deprecated 'IRQF_DISABLED' request_irq() flag entirely 2015-03-05 20:53:06 +01:00
ufs.txt [SCSI] ufshcd: UFS Host controller driver 2012-03-27 08:26:28 +01:00
wd719x.txt wd719x: Add firmware documentation 2014-11-25 15:42:55 +01:00