[PATCH for-next 7/9] IB/hfi1: Refactor hfi_user_exp_rcv_invalid() IOCTLs

Dennis Dalessandro
2017-09-26T14:04:29Z

Refactor _TID_INVAL_READ IOCTLs.

Reviewed-by: Ira Weiny <ira.weiny-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Michael J. Ruhl <michael.j.ruhl-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
---
drivers/infiniband/hw/hfi1/file_ops.c | 54 +++++++++++++++++++++--------
drivers/infiniband/hw/hfi1/user_exp_rcv.c | 3 --
2 files changed, 40 insertions(+), 17 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/file_ops.c b/drivers/infiniband/hw/hfi1/file_ops.c
index 5015898..6146899 100644
--- a/drivers/infiniband/hw/hfi1/file_ops.c
+++ b/drivers/infiniband/hw/hfi1/file_ops.c
@@ -90,6 +90,8 @@ static int user_exp_rcv_setup(struct hfi1_filedata *fd, unsigned long arg,
u32 len);
static int user_exp_rcv_clear(struct hfi1_filedata *fd, unsigned long arg,
u32 len);
+static int user_exp_rcv_invalid(struct hfi1_filedata *fd, unsigned long arg,
+ u32 len);
static int setup_base_ctxt(struct hfi1_filedata *fd,
struct hfi1_ctxtdata *uctxt);
static int setup_subctxt(struct hfi1_ctxtdata *uctxt);
@@ -223,9 +225,7 @@ static long hfi1_file_ioctl(struct file *fp, unsigned int cmd,
{
struct hfi1_filedata *fd = fp->private_data;
struct hfi1_ctxtdata *uctxt = fd->uctxt;
- struct hfi1_tid_info tinfo;
int ret = 0;
- unsigned long addr;
int uval = 0;
unsigned long ul_uval = 0;
u16 uval16 = 0;
@@ -263,18 +263,7 @@ static long hfi1_file_ioctl(struct file *fp, unsigned int cmd,
break;

case HFI1_IOCTL_TID_INVAL_READ:
- if (copy_from_user(&tinfo,
- (struct hfi11_tid_info __user *)arg,
- sizeof(tinfo)))
- return -EFAULT;
-
- ret = hfi1_user_exp_rcv_invalid(fd, &tinfo);
- if (ret)
- break;
- addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
- if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
- sizeof(tinfo.tidcnt)))
- ret = -EFAULT;
+ ret = user_exp_rcv_invalid(fd, arg, _IOC_SIZE(cmd));
break;

case HFI1_IOCTL_RECV_CTRL:
@@ -1469,6 +1458,43 @@ static int user_exp_rcv_clear(struct hfi1_filedata *fd, unsigned long arg,
return ret;
}

+/**
+ * user_exp_rcv_invalid - Invalidate the given tid rcv list
+ * @fd: file data of the current driver instance
+ * @arg: ioctl argumnent for user space information
+ * @len: length of data structure associated with ioctl command
+ *
+ * Wrapper to validate ioctl information before doing _rcv_invalid.
+ *
+ */
+static int user_exp_rcv_invalid(struct hfi1_filedata *fd, unsigned long arg,
+ u32 len)
+{
+ int ret;
+ unsigned long addr;
+ struct hfi1_tid_info tinfo;
+
+ if (sizeof(tinfo) != len)
+ return -EINVAL;
+
+ if (!fd->invalid_tids)
+ return -EINVAL;
+
+ if (copy_from_user(&tinfo, (void __user *)arg, (sizeof(tinfo))))
+ return -EFAULT;
+
+ ret = hfi1_user_exp_rcv_invalid(fd, &tinfo);
+ if (ret)
+ return ret;
+
+ addr = arg + offsetof(struct hfi1_tid_info, tidcnt);
+ if (copy_to_user((void __user *)addr, &tinfo.tidcnt,
+ sizeof(tinfo.tidcnt)))
+ ret = -EFAULT;
+
+ return ret;
+}
+
static unsigned int poll_urgent(struct file *fp,
struct poll_table_struct *pt)
{
diff --git a/drivers/infiniband/hw/hfi1/user_exp_rcv.c b/drivers/infiniband/hw/hfi1/user_exp_rcv.c
index ff9ad69..c1c596a 100644
--- a/drivers/infiniband/hw/hfi1/user_exp_rcv.c
+++ b/drivers/infiniband/hw/hfi1/user_exp_rcv.c
@@ -546,9 +546,6 @@ int hfi1_user_exp_rcv_invalid(struct hfi1_filedata *fd,
u32 *array;
int ret = 0;

- if (!fd->invalid_tids)
- return -EINVAL;
-
/*
* copy_to_user() can sleep, which will leave the invalid_lock
* locked and cause the MMU notifier to be blocked on the lock