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| author |   Nathan Chancellor <natechancellor@gmail.com> | 2019-02-07 09:07:20 -0700 |
|---|---|---|
| committer |   Martin K. Petersen <martin.petersen@oracle.com> | 2019-02-08 17:33:00 -0500 |
| commit | 6f4e626fb0cc93d50b49b79c2ee33bd769ee57f0 (patch) | |
| tree | bd3d49a1ad35778fd6f527668ce304b8c69ae936 /drivers/scsi/scsi_debug.c | |
| parent | scsi: lpfc: Update lpfc version to 12.2.0.0 (diff) | |
| download | linux-dev-6f4e626fb0cc93d50b49b79c2ee33bd769ee57f0.tar.xz linux-dev-6f4e626fb0cc93d50b49b79c2ee33bd769ee57f0.zip | |
scsi: ata: Use unsigned int for cmd's type in ioctls in scsi_host_template
Clang warns several times in the scsi subsystem (trimmed for brevity):
drivers/scsi/hpsa.c:6209:7: warning: overflow converting case value to
switch condition type (2147762695 to 18446744071562347015) [-Wswitch]
case CCISS_GETBUSTYPES:
^
drivers/scsi/hpsa.c:6208:7: warning: overflow converting case value to
switch condition type (2147762694 to 18446744071562347014) [-Wswitch]
case CCISS_GETHEARTBEAT:
^
The root cause is that the _IOC macro can generate really large numbers,
which don't fit into type 'int', which is used for the cmd parameter in
the ioctls in scsi_host_template. My research into how GCC and Clang are
handling this at a low level didn't prove fruitful. However, looking at
the rest of the kernel tree, all ioctls use an 'unsigned int' for the
cmd parameter, which will fit all of the _IOC values in the scsi/ata
subsystems.
Make that change because none of the ioctls expect a negative value for
any command, it brings the ioctls inline with the reset of the kernel,
and it removes ambiguity, which is never good when dealing with compilers.
Link: https://github.com/ClangBuiltLinux/linux/issues/85
Link: https://github.com/ClangBuiltLinux/linux/issues/154
Link: https://github.com/ClangBuiltLinux/linux/issues/157
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Acked-by: Bradley Grove <bgrove@attotech.com>
Acked-by: Don Brace <don.brace@microsemi.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to '')
| -rw-r--r-- | drivers/scsi/scsi_debug.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index 8044bb08455d..c5014e9f4a50 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -832,7 +832,8 @@ static void mk_sense_invalid_opcode(struct scsi_cmnd *scp) mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_OPCODE, 0); } -static int scsi_debug_ioctl(struct scsi_device *dev, int cmd, void __user *arg) +static int scsi_debug_ioctl(struct scsi_device *dev, unsigned int cmd, + void __user *arg) { if (sdebug_verbose) { if (0x1261 == cmd) |