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| author | Damien Le Moal <dlemoal@kernel.org> | 2023-06-23 09:30:57 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2023-06-29 03:47:09 +0200 |
| commit | 71e3e85ccf2b816e612c94b7460309dc5007caef (patch) | |
| tree | c77309c8637db7a6d6a2613ad2785d371bd3676c | |
| parent | scsi: isci: Fix comment typo (diff) | |
| download | linux-71e3e85ccf2b816e612c94b7460309dc5007caef.tar.xz linux-71e3e85ccf2b816e612c94b7460309dc5007caef.zip | |
scsi: core: Simplify scsi_cdl_check_cmd()
Reading the 800+ pages of SPC often leads to a brain shutdown and to less
than ideal code... This resulted in the checks of the rwcdlp and cdlp
fields in scsi_cdl_check_cmd() to have identical if-else branches.
Replace this with a comment describing the cases we are interested in and
replace the if-else code block with a simple test of the cdlp field that is
used as the function return value.
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Julia Lawall <julia.lawall@inria.fr>
Closes: https://lore.kernel.org/r/202306221657.BJHEADkz-lkp@intel.com/
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20230623073057.816199-1-dlemoal@kernel.org
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
| -rw-r--r-- | drivers/scsi/scsi.c | 37 |
1 files changed, 14 insertions, 23 deletions
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index c4bf99a842f3..d0911bc28663 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -586,31 +586,22 @@ static bool scsi_cdl_check_cmd(struct scsi_device *sdev, u8 opcode, u16 sa, if ((buf[1] & 0x03) != 0x03) return false; - /* See SPC-6, one command format of REPORT SUPPORTED OPERATION CODES */ + /* + * See SPC-6, One_command parameter data format for + * REPORT SUPPORTED OPERATION CODES. We have the following cases + * depending on rwcdlp (buf[0] & 0x01) value: + * - rwcdlp == 0: then cdlp indicates support for the A mode page when + * it is equal to 1 and for the B mode page when it is + * equal to 2. + * - rwcdlp == 1: then cdlp indicates support for the T2A mode page + * when it is equal to 1 and for the T2B mode page when + * it is equal to 2. + * Overall, to detect support for command duration limits, we only need + * to check that cdlp is 1 or 2. + */ cdlp = (buf[1] & 0x18) >> 3; - if (buf[0] & 0x01) { - /* rwcdlp == 1 */ - switch (cdlp) { - case 0x01: - /* T2A page */ - return true; - case 0x02: - /* T2B page */ - return true; - } - } else { - /* rwcdlp == 0 */ - switch (cdlp) { - case 0x01: - /* A page */ - return true; - case 0x02: - /* B page */ - return true; - } - } - return false; + return cdlp == 0x01 || cdlp == 0x02; } /** |