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authorNathan Chancellor <natechancellor@gmail.com>2019-02-07 09:07:20 -0700
committerMartin K. Petersen <martin.petersen@oracle.com>2019-02-08 17:33:00 -0500
commit6f4e626fb0cc93d50b49b79c2ee33bd769ee57f0 (patch)
treebd3d49a1ad35778fd6f527668ce304b8c69ae936 /drivers/scsi/esas2r
parent42fb055a57cab8d58db422efa4d867d3d8b39f8e (diff)
downloadlinux-6f4e626fb0cc93d50b49b79c2ee33bd769ee57f0.tar.bz2
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/esas2r')
-rw-r--r--drivers/scsi/esas2r/esas2r.h4
-rw-r--r--drivers/scsi/esas2r/esas2r_ioctl.c16
-rw-r--r--drivers/scsi/esas2r/esas2r_main.c2
3 files changed, 10 insertions, 12 deletions
diff --git a/drivers/scsi/esas2r/esas2r.h b/drivers/scsi/esas2r/esas2r.h
index 858c3b33db78..7f43b95f4e94 100644
--- a/drivers/scsi/esas2r/esas2r.h
+++ b/drivers/scsi/esas2r/esas2r.h
@@ -965,8 +965,8 @@ struct esas2r_adapter {
const char *esas2r_info(struct Scsi_Host *);
int esas2r_write_params(struct esas2r_adapter *a, struct esas2r_request *rq,
struct esas2r_sas_nvram *data);
-int esas2r_ioctl_handler(void *hostdata, int cmd, void __user *arg);
-int esas2r_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
+int esas2r_ioctl_handler(void *hostdata, unsigned int cmd, void __user *arg);
+int esas2r_ioctl(struct scsi_device *dev, unsigned int cmd, void __user *arg);
u8 handle_hba_ioctl(struct esas2r_adapter *a,
struct atto_ioctl *ioctl_hba);
int esas2r_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd);
diff --git a/drivers/scsi/esas2r/esas2r_ioctl.c b/drivers/scsi/esas2r/esas2r_ioctl.c
index 34bcc8c04ff4..3d130523c288 100644
--- a/drivers/scsi/esas2r/esas2r_ioctl.c
+++ b/drivers/scsi/esas2r/esas2r_ioctl.c
@@ -1274,7 +1274,7 @@ int esas2r_write_params(struct esas2r_adapter *a, struct esas2r_request *rq,
/* This function only cares about ATTO-specific ioctls (atto_express_ioctl) */
-int esas2r_ioctl_handler(void *hostdata, int cmd, void __user *arg)
+int esas2r_ioctl_handler(void *hostdata, unsigned int cmd, void __user *arg)
{
struct atto_express_ioctl *ioctl = NULL;
struct esas2r_adapter *a;
@@ -1292,9 +1292,8 @@ int esas2r_ioctl_handler(void *hostdata, int cmd, void __user *arg)
ioctl = memdup_user(arg, sizeof(struct atto_express_ioctl));
if (IS_ERR(ioctl)) {
esas2r_log(ESAS2R_LOG_WARN,
- "ioctl_handler access_ok failed for cmd %d, "
- "address %p", cmd,
- arg);
+ "ioctl_handler access_ok failed for cmd %u, address %p",
+ cmd, arg);
return PTR_ERR(ioctl);
}
@@ -1493,7 +1492,7 @@ int esas2r_ioctl_handler(void *hostdata, int cmd, void __user *arg)
ioctl_done:
if (err < 0) {
- esas2r_log(ESAS2R_LOG_WARN, "err %d on ioctl cmd %d", err,
+ esas2r_log(ESAS2R_LOG_WARN, "err %d on ioctl cmd %u", err,
cmd);
switch (err) {
@@ -1518,9 +1517,8 @@ ioctl_done:
err = __copy_to_user(arg, ioctl, sizeof(struct atto_express_ioctl));
if (err != 0) {
esas2r_log(ESAS2R_LOG_WARN,
- "ioctl_handler copy_to_user didn't copy "
- "everything (err %d, cmd %d)", err,
- cmd);
+ "ioctl_handler copy_to_user didn't copy everything (err %d, cmd %u)",
+ err, cmd);
kfree(ioctl);
return -EFAULT;
@@ -1531,7 +1529,7 @@ ioctl_done:
return 0;
}
-int esas2r_ioctl(struct scsi_device *sd, int cmd, void __user *arg)
+int esas2r_ioctl(struct scsi_device *sd, unsigned int cmd, void __user *arg)
{
return esas2r_ioctl_handler(sd->host->hostdata, cmd, arg);
}
diff --git a/drivers/scsi/esas2r/esas2r_main.c b/drivers/scsi/esas2r/esas2r_main.c
index 64397d441bae..fdbda5c05aa0 100644
--- a/drivers/scsi/esas2r/esas2r_main.c
+++ b/drivers/scsi/esas2r/esas2r_main.c
@@ -623,7 +623,7 @@ static int esas2r_proc_major;
long esas2r_proc_ioctl(struct file *fp, unsigned int cmd, unsigned long arg)
{
return esas2r_ioctl_handler(esas2r_proc_host->hostdata,
- (int)cmd, (void __user *)arg);
+ cmd, (void __user *)arg);
}
static void __exit esas2r_exit(void)