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| author | Benjamin Block <bblock@linux.ibm.com> | 2020-02-19 18:09:25 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2020-02-24 20:51:15 +0300 |
| commit | a3fd4bfe85fbb67cf4ec1232d0af625ece3c508b (patch) | |
| tree | 70d90f377984f45912c31568c98869e5a22e9a33 /drivers/s390/char/sclp_cpi_sys.c | |
| parent | 51fdaa0490241e8cd41b40cbf43a336d1a014460 (diff) | |
| download | linux-a3fd4bfe85fbb67cf4ec1232d0af625ece3c508b.tar.xz | |
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: a10a61e807b0 ("scsi: zfcp: support retrieval of SFP Data via Exchange Port Data")
Fixes: 6028f7c4cd87 ("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>
Diffstat (limited to 'drivers/s390/char/sclp_cpi_sys.c')
0 files changed, 0 insertions, 0 deletions