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scsi: pmcraid: use __iomem pointers for ioctl argument 

kernelci.org reports a new compile warning for old code in the pmcraid
driver:

arch/mips/include/asm/uaccess.h:138:21: warning: passing argument 1 of '__access_ok' makes pointer from integer without a cast [-Wint-conversion]

The warning got introduced by a cleanup to the access_ok() helper that
requires the argument to be a pointer, where the old version silently
accepts 'unsigned long' arguments as it still does on most other
architectures.

The new behavior in MIPS however seems absolutely sensible, and so far I
could only find one other file with the same issue, so the best solution
seems to be to clean up the pmcraid driver.

This makes the driver consistently use 'void __iomem *' pointers for
passing around the address of the user space ioctl arguments, which gets
rid of the kernelci warning as well as several sparse warnings.

Fixes: f0a955f4ee ("mips: sanitize __access_ok()")
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Arnd Bergmann 2017-04-20 19:54:45 +02:00 committed by Martin K. Petersen
parent 9140260864
commit 3397623b37
1 changed files with 16 additions and 28 deletions
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44
drivers/scsi/pmcraid.c
View File

@ -3322,7 +3322,7 @@ static struct pmcraid_sglist *pmcraid_alloc_sglist(int buflen)
*/
static int pmcraid_copy_sglist(
struct pmcraid_sglist *sglist,
unsigned long buffer,
void __user *buffer,
u32 len,
int direction
)
@ -3343,11 +3343,9 @@ static int pmcraid_copy_sglist(
kaddr = kmap(page);
if (direction == DMA_TO_DEVICE)
rc = __copy_from_user(kaddr,
(void *)buffer,
bsize_elem);
rc = __copy_from_user(kaddr, buffer, bsize_elem);
else
rc = __copy_to_user((void *)buffer, kaddr, bsize_elem);
rc = __copy_to_user(buffer, kaddr, bsize_elem);
kunmap(page);
@ -3365,13 +3363,9 @@ static int pmcraid_copy_sglist(
kaddr = kmap(page);
if (direction == DMA_TO_DEVICE)
rc = __copy_from_user(kaddr,
(void *)buffer,
len % bsize_elem);
rc = __copy_from_user(kaddr, buffer, len % bsize_elem);
else
rc = __copy_to_user((void *)buffer,
kaddr,
len % bsize_elem);
rc = __copy_to_user(buffer, kaddr, len % bsize_elem);
kunmap(page);
@ -3649,17 +3643,17 @@ static long pmcraid_ioctl_passthrough(
struct pmcraid_instance *pinstance,
unsigned int ioctl_cmd,
unsigned int buflen,
unsigned long arg
void __user *arg
)
{
struct pmcraid_passthrough_ioctl_buffer *buffer;
struct pmcraid_ioarcb *ioarcb;
struct pmcraid_cmd *cmd;
struct pmcraid_cmd *cancel_cmd;
unsigned long request_buffer;
void __user *request_buffer;
unsigned long request_offset;
unsigned long lock_flags;
void *ioasa;
void __user *ioasa;
u32 ioasc;
int request_size;
int buffer_size;
@ -3698,13 +3692,10 @@ static long pmcraid_ioctl_passthrough(
request_buffer = arg + request_offset;
rc = __copy_from_user(buffer,
(struct pmcraid_passthrough_ioctl_buffer *) arg,
rc = __copy_from_user(buffer, arg,
sizeof(struct pmcraid_passthrough_ioctl_buffer));
ioasa =
(void *)(arg +
offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa));
ioasa = arg + offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa);
if (rc) {
pmcraid_err("ioctl: can't copy passthrough buffer\n");
@ -4018,6 +4009,7 @@ static long pmcraid_chr_ioctl(
{
struct pmcraid_instance *pinstance = NULL;
struct pmcraid_ioctl_header *hdr = NULL;
void __user *argp = (void __user *)arg;
int retval = -ENOTTY;
hdr = kmalloc(sizeof(struct pmcraid_ioctl_header), GFP_KERNEL);
@ -4027,7 +4019,7 @@ static long pmcraid_chr_ioctl(
return -ENOMEM;
}
retval = pmcraid_check_ioctl_buffer(cmd, (void *)arg, hdr);
retval = pmcraid_check_ioctl_buffer(cmd, argp, hdr);
if (retval) {
pmcraid_info("chr_ioctl: header check failed\n");
@ -4052,10 +4044,8 @@ static long pmcraid_chr_ioctl(
if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
scsi_block_requests(pinstance->host);
retval = pmcraid_ioctl_passthrough(pinstance,
cmd,
hdr->buffer_length,
arg);
retval = pmcraid_ioctl_passthrough(pinstance, cmd,
hdr->buffer_length, argp);
if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
scsi_unblock_requests(pinstance->host);
@ -4063,10 +4053,8 @@ static long pmcraid_chr_ioctl(
case PMCRAID_DRIVER_IOCTL:
arg += sizeof(struct pmcraid_ioctl_header);
retval = pmcraid_ioctl_driver(pinstance,
cmd,
hdr->buffer_length,
(void __user *)arg);
retval = pmcraid_ioctl_driver(pinstance, cmd,
hdr->buffer_length, argp);
break;
default: