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scsi: ata: Use unsigned int for cmd's type in ioctls in scsi_host_template

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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>
This commit is contained in:
Nathan Chancellor
2019-02-07 09:07:20 -07:00
committed by Martin K. Petersen
parent 42fb055a57
commit 6f4e626fb0
19 changed files with 54 additions and 44 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/scsi/hpsa.c
View File

@@ -251,10 +251,11 @@ static int number_of_controllers;
static irqreturn_t do_hpsa_intr_intx(int irq, void *dev_id);
static irqreturn_t do_hpsa_intr_msi(int irq, void *dev_id);
static int hpsa_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
static int hpsa_ioctl(struct scsi_device *dev, unsigned int cmd,
void __user *arg);
#ifdef CONFIG_COMPAT
static int hpsa_compat_ioctl(struct scsi_device *dev, int cmd,
static int hpsa_compat_ioctl(struct scsi_device *dev, unsigned int cmd,
void __user *arg);
#endif
@@ -6127,7 +6128,7 @@ static void cmd_free(struct ctlr_info *h, struct CommandList *c)
#ifdef CONFIG_COMPAT
static int hpsa_ioctl32_passthru(struct scsi_device *dev, int cmd,
static int hpsa_ioctl32_passthru(struct scsi_device *dev, unsigned int cmd,
void __user *arg)
{
IOCTL32_Command_struct __user *arg32 =
@@ -6164,7 +6165,7 @@ static int hpsa_ioctl32_passthru(struct scsi_device *dev, int cmd,
}
static int hpsa_ioctl32_big_passthru(struct scsi_device *dev,
int cmd, void __user *arg)
unsigned int cmd, void __user *arg)
{
BIG_IOCTL32_Command_struct __user *arg32 =
(BIG_IOCTL32_Command_struct __user *) arg;
@@ -6201,7 +6202,8 @@ static int hpsa_ioctl32_big_passthru(struct scsi_device *dev,
return err;
}
static int hpsa_compat_ioctl(struct scsi_device *dev, int cmd, void __user *arg)
static int hpsa_compat_ioctl(struct scsi_device *dev, unsigned int cmd,
void __user *arg)
{
switch (cmd) {
case CCISS_GETPCIINFO:
@@ -6521,7 +6523,8 @@ static void check_ioctl_unit_attention(struct ctlr_info *h,
/*
* ioctl
*/
static int hpsa_ioctl(struct scsi_device *dev, int cmd, void __user *arg)
static int hpsa_ioctl(struct scsi_device *dev, unsigned int cmd,
void __user *arg)
{
struct ctlr_info *h;
void __user *argp = (void __user *)arg;