linux/drivers/s390
Benjamin Block a3fd4bfe85 scsi: zfcp: fix wrong data and display format of SFP+ temperature
When implementing support for retrieval of local diagnostic data from the
FCP channel, the wrong data format was assumed for the temperature of the
local SFP+ connector. The Fibre Channel Link Services (FC-LS-3)
specification is not clear on the format of the stored integer, and only
after consulting the SNIA specification SFF-8472 did we realize it is
stored as two's complement. Thus, the used data and display format is
wrong, and highly misleading for users when the temperature should drop
below 0°C (however unlikely that may be).

To fix this, change the data format in `struct fsf_qtcb_bottom_port` from
unsigned to signed, and change the printf format string used to generate
`zfcp_sysfs_adapter_diag_sfp_temperature_show()` from `%hu` to `%hd`.

Link: https://lore.kernel.org/r/d6e3be5428da5c9490cfff4df7cae868bc9f1a7e.1582039501.git.bblock@linux.ibm.com
Fixes: a10a61e807 ("scsi: zfcp: support retrieval of SFP Data via Exchange Port Data")
Fixes: 6028f7c4cd ("scsi: zfcp: introduce sysfs interface for diagnostics of local SFP transceiver")
Cc: <stable@vger.kernel.org> # 5.5+
Reviewed-by: Jens Remus <jremus@linux.ibm.com>
Reviewed-by: Fedor Loshakov <loshakov@linux.ibm.com>
Reviewed-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Benjamin Block <bblock@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2020-02-24 12:51:15 -05:00
..
block proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
char compat_ioctl: move tape handling into drivers 2019-10-23 17:23:44 +02:00
cio proc: convert everything to "struct proc_ops" 2020-02-04 03:05:26 +00:00
crypto s390/pkey/zcrypt: Support EP11 AES secure keys 2020-01-30 13:07:56 +01:00
net s390/qeth: remove HARDSETUP state 2020-01-26 15:20:32 +01:00
scsi scsi: zfcp: fix wrong data and display format of SFP+ temperature 2020-02-24 12:51:15 -05:00
virtio virtio/s390: fix race on airq_areas[] 2019-07-26 13:36:18 +02:00
Makefile s390: remove pointless drivers-y in drivers/s390/Makefile 2019-09-16 13:21:51 +02:00