diff options
Diffstat (limited to 'drivers/infiniband')
| -rw-r--r-- | drivers/infiniband/hw/ipath/ipath_diag.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_diag.c b/drivers/infiniband/hw/ipath/ipath_diag.c index 0f13a2182cc..63e8368b0e9 100644 --- a/drivers/infiniband/hw/ipath/ipath_diag.c +++ b/drivers/infiniband/hw/ipath/ipath_diag.c @@ -296,7 +296,7 @@ static int ipath_diag_open(struct inode *in, struct file *fp) } fp->private_data = dd; - ipath_diag_inuse = 1; + ipath_diag_inuse = -2; diag_set_link = 0; ret = 0; @@ -461,6 +461,8 @@ static ssize_t ipath_diag_read(struct file *fp, char __user *data, else if ((count % 4) || (*off % 4)) /* address or length is not 32-bit aligned, hence invalid */ ret = -EINVAL; + else if (ipath_diag_inuse < 1 && (*off || count != 8)) + ret = -EINVAL; /* prevent cat /dev/ipath_diag* */ else if ((count % 8) || (*off % 8)) /* address or length not 64-bit aligned; do 32-bit reads */ ret = ipath_read_umem32(dd, data, kreg_base + *off, count); @@ -470,6 +472,8 @@ static ssize_t ipath_diag_read(struct file *fp, char __user *data, if (ret >= 0) { *off += count; ret = count; + if (ipath_diag_inuse == -2) + ipath_diag_inuse++; } return ret; @@ -489,6 +493,9 @@ static ssize_t ipath_diag_write(struct file *fp, const char __user *data, else if ((count % 4) || (*off % 4)) /* address or length is not 32-bit aligned, hence invalid */ ret = -EINVAL; + else if ((ipath_diag_inuse == -1 && (*off || count != 8)) || + ipath_diag_inuse == -2) /* read qw off 0, write qw off 0 */ + ret = -EINVAL; /* before any other write allowed */ else if ((count % 8) || (*off % 8)) /* address or length not 64-bit aligned; do 32-bit writes */ ret = ipath_write_umem32(dd, kreg_base + *off, data, count); @@ -498,6 +505,8 @@ static ssize_t ipath_diag_write(struct file *fp, const char __user *data, if (ret >= 0) { *off += count; ret = count; + if (ipath_diag_inuse == -1) + ipath_diag_inuse = 1; /* all read/write OK now */ } return ret; |