diff options
| 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/cxlflash/common.h | |
| parent | 42fb055a57cab8d58db422efa4d867d3d8b39f8e (diff) | |
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 'drivers/scsi/cxlflash/common.h')
| -rw-r--r-- | drivers/scsi/cxlflash/common.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/scsi/cxlflash/common.h b/drivers/scsi/cxlflash/common.h index 8908a20065c8..4d90106fcb37 100644 --- a/drivers/scsi/cxlflash/common.h +++ b/drivers/scsi/cxlflash/common.h @@ -334,7 +334,8 @@ int cxlflash_afu_sync(struct afu *afu, ctx_hndl_t c, res_hndl_t r, u8 mode); void cxlflash_list_init(void); void cxlflash_term_global_luns(void); void cxlflash_free_errpage(void); -int cxlflash_ioctl(struct scsi_device *sdev, int cmd, void __user *arg); +int cxlflash_ioctl(struct scsi_device *sdev, unsigned int cmd, + void __user *arg); void cxlflash_stop_term_user_contexts(struct cxlflash_cfg *cfg); int cxlflash_mark_contexts_error(struct cxlflash_cfg *cfg); void cxlflash_term_local_luns(struct cxlflash_cfg *cfg); |