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 /include/scsi/scsi_host.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 'include/scsi/scsi_host.h')
| -rw-r--r-- | include/scsi/scsi_host.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index 6ca954e9f752..4047d68d1b08 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -60,7 +60,8 @@ struct scsi_host_template { * * Status: OPTIONAL */ - int (* ioctl)(struct scsi_device *dev, int cmd, void __user *arg); + int (*ioctl)(struct scsi_device *dev, unsigned int cmd, + void __user *arg); #ifdef CONFIG_COMPAT @@ -70,7 +71,8 @@ struct scsi_host_template { * * Status: OPTIONAL */ - int (* compat_ioctl)(struct scsi_device *dev, int cmd, void __user *arg); + int (*compat_ioctl)(struct scsi_device *dev, unsigned int cmd, + void __user *arg); #endif /* |