[PATCH] scsi/ata: Use unsigned int for cmd's type in ioctls in scsi_host_template

* [PATCH] scsi/ata: Use unsigned int for cmd's type in ioctls in scsi_host_template
@ 2018-10-19 17:57 Nathan Chancellor
  2018-10-19 19:38 ` Bart Van Assche
                   ` (2 more replies)
  0 siblings, 3 replies; 19+ messages in thread
From: Nathan Chancellor @ 2018-10-19 17:57 UTC (permalink / raw)
  To: Jens Axboe, James E.J. Bottomley, Martin K. Petersen
  Cc: Adaptec OEM Raid Solutions, Manoj N. Kumar, Matthew R. Ochs,
	Uma Krishnan, Bradley Grove, Don Brace, Brian King,
	Bart Van Assche, linux-ide, linux-kernel, linux-scsi,
	esc.storagedev, Nathan Chancellor

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 find into type 'int', which is used for the cmd paremeter 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 to take a negative
value, 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>
---
 drivers/ata/libata-scsi.c             |  5 +++--
 drivers/scsi/aacraid/aachba.c         |  2 +-
 drivers/scsi/aacraid/aacraid.h        |  4 ++--
 drivers/scsi/aacraid/commctrl.c       |  2 +-
 drivers/scsi/aacraid/linit.c          |  6 ++++--
 drivers/scsi/cxlflash/superpipe.c     | 12 +++++-------
 drivers/scsi/esas2r/esas2r.h          |  4 ++--
 drivers/scsi/esas2r/esas2r_ioctl.c    | 13 ++++++-------
 drivers/scsi/esas2r/esas2r_main.c     |  2 +-
 drivers/scsi/hpsa.c                   | 15 +++++++++------
 drivers/scsi/ipr.c                    |  3 ++-
 drivers/scsi/libsas/sas_scsi_host.c   |  2 +-
 drivers/scsi/scsi_debug.c             |  3 ++-
 drivers/scsi/smartpqi/smartpqi_init.c |  3 ++-
 include/linux/libata.h                |  5 +++--
 include/scsi/libsas.h                 |  3 ++-
 include/scsi/scsi_host.h              |  6 ++++--
 17 files changed, 50 insertions(+), 40 deletions(-)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 3d4887d0e84a..6291f1dbf342 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -778,7 +778,7 @@ static int ata_ioc32(struct ata_port *ap)
 }
 
 int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
-		     int cmd, void __user *arg)
+		     unsigned int cmd, void __user *arg)
 {
 	unsigned long val;
 	int rc = -EINVAL;
@@ -829,7 +829,8 @@ int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
 }
 EXPORT_SYMBOL_GPL(ata_sas_scsi_ioctl);
 
-int ata_scsi_ioctl(struct scsi_device *scsidev, int cmd, void __user *arg)
+int ata_scsi_ioctl(struct scsi_device *scsidev, unsigned int cmd,
+		   void __user *arg)
 {
 	return ata_sas_scsi_ioctl(ata_shost_to_port(scsidev->host),
 				scsidev, cmd, arg);
diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index bd7f352c28f3..a6399fac3333 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -3452,7 +3452,7 @@ static int delete_disk(struct aac_dev *dev, void __user *arg)
 	}
 }
 
-int aac_dev_ioctl(struct aac_dev *dev, int cmd, void __user *arg)
+int aac_dev_ioctl(struct aac_dev *dev, unsigned int cmd, void __user *arg)
 {
 	switch (cmd) {
 	case FSACTL_QUERY_DISK:
diff --git a/drivers/scsi/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h
index 39eb415987fc..1965072ab673 100644
--- a/drivers/scsi/aacraid/aacraid.h
+++ b/drivers/scsi/aacraid/aacraid.h
@@ -2705,12 +2705,12 @@ void aac_set_intx_mode(struct aac_dev *dev);
 int aac_get_config_status(struct aac_dev *dev, int commit_flag);
 int aac_get_containers(struct aac_dev *dev);
 int aac_scsi_cmd(struct scsi_cmnd *cmd);
-int aac_dev_ioctl(struct aac_dev *dev, int cmd, void __user *arg);
+int aac_dev_ioctl(struct aac_dev *dev, unsigned int cmd, void __user *arg);
 #ifndef shost_to_class
 #define shost_to_class(shost) &shost->shost_dev
 #endif
 ssize_t aac_get_serial_number(struct device *dev, char *buf);
-int aac_do_ioctl(struct aac_dev * dev, int cmd, void __user *arg);
+int aac_do_ioctl(struct aac_dev *dev, unsigned int cmd, void __user *arg);
 int aac_rx_init(struct aac_dev *dev);
 int aac_rkt_init(struct aac_dev *dev);
 int aac_nark_init(struct aac_dev *dev);
diff --git a/drivers/scsi/aacraid/commctrl.c b/drivers/scsi/aacraid/commctrl.c
index 25f6600d6c09..fd8a10871598 100644
--- a/drivers/scsi/aacraid/commctrl.c
+++ b/drivers/scsi/aacraid/commctrl.c
@@ -1061,7 +1061,7 @@ static int aac_send_reset_adapter(struct aac_dev *dev, void __user *arg)
 	return retval;
 }
 
-int aac_do_ioctl(struct aac_dev * dev, int cmd, void __user *arg)
+int aac_do_ioctl(struct aac_dev *dev, unsigned int cmd, void __user *arg)
 {
 	int status;
 
diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c
index 2d4e4ddc5ace..cd2efb44f62c 100644
--- a/drivers/scsi/aacraid/linit.c
+++ b/drivers/scsi/aacraid/linit.c
@@ -616,7 +616,8 @@ static struct device_attribute *aac_dev_attrs[] = {
 	NULL,
 };
 
-static int aac_ioctl(struct scsi_device *sdev, int cmd, void __user * arg)
+static int aac_ioctl(struct scsi_device *sdev, unsigned int cmd,
+		     void __user *arg)
 {
 	struct aac_dev *dev = (struct aac_dev *)sdev->host->hostdata;
 	if (!capable(CAP_SYS_RAWIO))
@@ -1205,7 +1206,8 @@ static long aac_compat_do_ioctl(struct aac_dev *dev, unsigned cmd, unsigned long
 	return ret;
 }
 
-static int aac_compat_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
+static int aac_compat_ioctl(struct scsi_device *sdev, unsigned int cmd,
+			    void __user *arg)
 {
 	struct aac_dev *dev = (struct aac_dev *)sdev->host->hostdata;
 	if (!capable(CAP_SYS_RAWIO))
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 @@ static int cxlflash_disk_verify(struct scsi_device *sdev,
  *
  * 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 @@ static int cxlflash_disk_direct_open(struct scsi_device *sdev, void *arg)
  *
  * 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 @@ static int ioctl_common(struct scsi_device *sdev, int cmd)
  *
  * 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;
 		}
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..916b9adf4921 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;
@@ -1292,7 +1292,7 @@ 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, "
+			   "ioctl_handler access_ok failed for cmd %u, "
 			   "address %p", cmd,
 			   arg);
 		return PTR_ERR(ioctl);
@@ -1493,7 +1493,7 @@ 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 +1518,8 @@ int esas2r_ioctl_handler(void *hostdata, int cmd, void __user *arg)
 	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 +1530,7 @@ int esas2r_ioctl_handler(void *hostdata, int cmd, void __user *arg)
 	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 c07118617d89..25dc8d44ed8e 100644
--- a/drivers/scsi/esas2r/esas2r_main.c
+++ b/drivers/scsi/esas2r/esas2r_main.c
@@ -624,7 +624,7 @@ 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)
diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index c9cccf35e9d7..c9d41d3b50f1 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -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
 
@@ -6123,7 +6124,7 @@ 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 =
@@ -6160,7 +6161,7 @@ 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;
@@ -6197,7 +6198,8 @@ 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:
@@ -6517,7 +6519,8 @@ 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;
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 271990bc065b..97fcc881f9f1 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -6696,7 +6696,8 @@ static int ipr_queuecommand(struct Scsi_Host *shost,
  * Return value:
  * 	0 on success / other on failure
  **/
-static int ipr_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
+static int ipr_ioctl(struct scsi_device *sdev, unsigned int cmd,
+		     void __user *arg)
 {
 	struct ipr_resource_entry *res;
 
diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index 33229348dcb6..4eeaafbe0504 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -805,7 +805,7 @@ void sas_scsi_recover_host(struct Scsi_Host *shost)
 		    shost->host_failed, tries);
 }
 
-int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
+int sas_ioctl(struct scsi_device *sdev, unsigned int cmd, void __user *arg)
 {
 	struct domain_device *dev = sdev_to_domain_dev(sdev);
 
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 60bcc6df97a9..4c513651c95f 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -836,7 +836,8 @@ static void mk_sense_invalid_opcode(struct scsi_cmnd *scp)
 	mk_sense_buffer(scp, ILLEGAL_REQUEST, INVALID_OPCODE, 0);
 }
 
-static int scsi_debug_ioctl(struct scsi_device *dev, int cmd, void __user *arg)
+static int scsi_debug_ioctl(struct scsi_device *dev, unsigned int cmd,
+			    void __user *arg)
 {
 	if (sdebug_verbose) {
 		if (0x1261 == cmd)
diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index a25a07a0b7f0..498bdfbbebfa 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -5572,7 +5572,8 @@ static int pqi_passthru_ioctl(struct pqi_ctrl_info *ctrl_info, void __user *arg)
 	return rc;
 }
 
-static int pqi_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
+static int pqi_ioctl(struct scsi_device *sdev, unsigned int cmd,
+		     void __user *arg)
 {
 	int rc;
 	struct pqi_ctrl_info *ctrl_info;
diff --git a/include/linux/libata.h b/include/linux/libata.h
index 38c95d66ab12..263ca4f05c24 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1123,10 +1123,11 @@ extern int ata_host_activate(struct ata_host *host, int irq,
 extern void ata_host_detach(struct ata_host *host);
 extern void ata_host_init(struct ata_host *, struct device *, struct ata_port_operations *);
 extern int ata_scsi_detect(struct scsi_host_template *sht);
-extern int ata_scsi_ioctl(struct scsi_device *dev, int cmd, void __user *arg);
+extern int ata_scsi_ioctl(struct scsi_device *dev, unsigned int cmd,
+			  void __user *arg);
 extern int ata_scsi_queuecmd(struct Scsi_Host *h, struct scsi_cmnd *cmd);
 extern int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *dev,
-			    int cmd, void __user *arg);
+			    unsigned int cmd, void __user *arg);
 extern void ata_sas_port_destroy(struct ata_port *);
 extern struct ata_port *ata_sas_port_alloc(struct ata_host *,
 					   struct ata_port_info *, struct Scsi_Host *);
diff --git a/include/scsi/libsas.h b/include/scsi/libsas.h
index 3de3b10da19a..70461264d6e7 100644
--- a/include/scsi/libsas.h
+++ b/include/scsi/libsas.h
@@ -709,7 +709,8 @@ int sas_eh_target_reset_handler(struct scsi_cmnd *cmd);
 
 extern void sas_target_destroy(struct scsi_target *);
 extern int sas_slave_alloc(struct scsi_device *);
-extern int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg);
+extern int sas_ioctl(struct scsi_device *sdev, unsigned int cmd,
+		     void __user *arg);
 extern int sas_drain_work(struct sas_ha_struct *ha);
 
 extern void sas_ssp_task_response(struct device *dev, struct sas_task *task,
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 5ea06d310a25..5c1df26e1d4f 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -65,7 +65,8 @@ 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
@@ -75,7 +76,8 @@ 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
 
 	/*
-- 
2.19.1


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