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>

1 files changed, 5 insertions, 7 deletions

diff --git a/drivers/scsi/cxlflash/superpipe.c b/drivers/scsi/cxlflash/superpipe.c
index acac6152f50b..1a94a469051e 100644
--- a/drivers/scsi/cxlflash/superpipe.c
+++ b/drivers/scsi/cxlflash/superpipe.c
@@ -1924,7 +1924,7 @@ out:
  *
  * Return: A string identifying the decoded ioctl.
  */
-static char *decode_ioctl(int cmd)
+static char *decode_ioctl(unsigned int cmd)
 {
 	switch (cmd) {
 	case DK_CXLFLASH_ATTACH:
@@ -2051,7 +2051,7 @@ err1:
  *
  * Return: 0 on success, -errno on failure
  */
-static int ioctl_common(struct scsi_device *sdev, int cmd)
+static int ioctl_common(struct scsi_device *sdev, unsigned int cmd)
 {
 	struct cxlflash_cfg *cfg = shost_priv(sdev->host);
 	struct device *dev = &cfg->dev->dev;
@@ -2096,7 +2096,7 @@ out:
  *
  * Return: 0 on success, -errno on failure
  */
-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)
 {
 	typedef int (*sioctl) (struct scsi_device *, void *);
 
@@ -2179,8 +2179,7 @@ int cxlflash_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 	}
 
 	if (unlikely(copy_from_user(&buf, arg, size))) {
-		dev_err(dev, "%s: copy_from_user() fail "
-			"size=%lu cmd=%d (%s) arg=%p\n",
+		dev_err(dev, "%s: copy_from_user() fail size=%lu cmd=%u (%s) arg=%p\n",
 			__func__, size, cmd, decode_ioctl(cmd), arg);
 		rc = -EFAULT;
 		goto cxlflash_ioctl_exit;
@@ -2203,8 +2202,7 @@ int cxlflash_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 	rc = do_ioctl(sdev, (void *)&buf);
 	if (likely(!rc))
 		if (unlikely(copy_to_user(arg, &buf, size))) {
-			dev_err(dev, "%s: copy_to_user() fail "
-				"size=%lu cmd=%d (%s) arg=%p\n",
+			dev_err(dev, "%s: copy_to_user() fail size=%lu cmd=%u (%s) arg=%p\n",
 				__func__, size, cmd, decode_ioctl(cmd), arg);
 			rc = -EFAULT;
 		}