From 2d1900f131f015ff335c53b655edfb4e10e57ee7 Mon Sep 17 00:00:00 2001 From: Dennis Dalessandro Date: Wed, 2 Dec 2015 00:43:38 -0500 Subject: [PATCH] staging/rdma/hfi1: Return immediately on error Now that the spinlock is not taken throughout hfi1_ioctl it is safe to return early rather than setting a variable and falling through the switch. Reviewed-by: Mike Marciniszyn Signed-off-by: Dennis Dalessandro Signed-off-by: Ira Weiny Signed-off-by: Greg Kroah-Hartman --- drivers/staging/rdma/hfi1/diag.c | 62 +++++++++++++------------------- 1 file changed, 24 insertions(+), 38 deletions(-) diff --git a/drivers/staging/rdma/hfi1/diag.c b/drivers/staging/rdma/hfi1/diag.c index b0b7e28ebfc2..0c8831705664 100644 --- a/drivers/staging/rdma/hfi1/diag.c +++ b/drivers/staging/rdma/hfi1/diag.c @@ -1019,20 +1019,16 @@ static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) if (copy_from_user(&link_info, (struct hfi1_link_info __user *)arg, sizeof(link_info))) - ret = -EFAULT; + return -EFAULT; value = link_info.port_state; index = link_info.port_number; - if (index > dd->num_pports - 1) { - ret = -EINVAL; - break; - } + if (index > dd->num_pports - 1) + return -EINVAL; ppd = &dd->pport[index]; - if (!ppd) { - ret = -EINVAL; - break; - } + if (!ppd) + return -EINVAL; /* What we want to transition to */ phys_state = (value >> 4) & 0xF; @@ -1056,8 +1052,7 @@ static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) dev_state = HLS_DN_DISABLE; break; default: - ret = -EINVAL; - goto done; + return -EINVAL; } ret = set_link_state(ppd, dev_state); break; @@ -1072,8 +1067,7 @@ static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) send_idle_sma(dd, SMA_IDLE_ACTIVE); break; default: - ret = -EINVAL; - break; + return -EINVAL; } if (ret) @@ -1086,7 +1080,7 @@ static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) if (copy_from_user(&link_info, (struct hfi1_link_info __user *)arg, sizeof(link_info))) - ret = -EFAULT; + return -EFAULT; index = link_info.port_number; } else { ret = __get_user(index, (int __user *)arg); @@ -1094,16 +1088,13 @@ static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) break; } - if (index > dd->num_pports - 1) { - ret = -EINVAL; - break; - } + if (index > dd->num_pports - 1) + return -EINVAL; ppd = &dd->pport[index]; - if (!ppd) { - ret = -EINVAL; - break; - } + if (!ppd) + return -EINVAL; + value = hfi1_ibphys_portstate(ppd); value <<= 4; value |= driver_lstate(ppd); @@ -1120,7 +1111,7 @@ static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) ppd->link_width_active; if (copy_to_user((struct hfi1_link_info __user *)arg, &link_info, sizeof(link_info))) - ret = -EFAULT; + return -EFAULT; } else { ret = __put_user(value, (int __user *)arg); } @@ -1151,14 +1142,12 @@ static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) /* just copy command structure */ argp = (unsigned long *)arg; if (copy_from_user(&filter_cmd, (void __user *)argp, - sizeof(filter_cmd))) { - ret = -EFAULT; - break; - } + sizeof(filter_cmd))) + return -EFAULT; + if (filter_cmd.opcode >= HFI1_MAX_FILTERS) { pr_alert("Invalid opcode in request\n"); - ret = -EINVAL; - break; + return -EINVAL; } snoop_dbg("Opcode %d Len %d Ptr %p", @@ -1167,17 +1156,15 @@ static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) filter_value = kcalloc(filter_cmd.length, sizeof(u8), GFP_KERNEL); - if (!filter_value) { - ret = -ENOMEM; - break; - } + if (!filter_value) + return -ENOMEM; + /* copy remaining data from userspace */ if (copy_from_user((u8 *)filter_value, (void __user *)filter_cmd.value_ptr, filter_cmd.length)) { kfree(filter_value); - ret = -EFAULT; - break; + return -EFAULT; } /* Drain packets first */ spin_lock_irqsave(&dd->hfi1_snoop.snoop_lock, flags); @@ -1207,10 +1194,9 @@ static long hfi1_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) snoop_flags |= SNOOP_USE_METADATA; break; default: - ret = -ENOTTY; - break; + return -ENOTTY; } -done: + return ret; } -- 2.20.1