[IB/ucm]: Clean up userspace CM

Only print debug messages when debug_level is set.
Eliminate NULL checks prior to calling kfree.

Signed-off-by: Hal Rosenstock <halr@voltaire.com>
Signed-off-by: Libor Michalek <libor@topspin.com>

1 files changed, 41 insertions, 47 deletions

diff --git a/drivers/infiniband/core/ucm.c b/drivers/infiniband/core/ucm.c
index 546ec61c407f..61d07c732f49 100644
--- a/drivers/infiniband/core/ucm.c
+++ b/drivers/infiniband/core/ucm.c
@@ -49,6 +49,11 @@ MODULE_AUTHOR("Libor Michalek");
 MODULE_DESCRIPTION("InfiniBand userspace Connection Manager access");
 MODULE_LICENSE("Dual BSD/GPL");
 
+static int ucm_debug_level;
+
+module_param_named(debug_level, ucm_debug_level, int, 0644);
+MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
+
 enum {
         IB_UCM_MAJOR = 231,
         IB_UCM_MINOR = 255
@@ -56,6 +61,14 @@ enum {
 
 #define IB_UCM_DEV MKDEV(IB_UCM_MAJOR, IB_UCM_MINOR)
 
+#define PFX "UCM: "
+
+#define ucm_dbg(format, arg...)                 \
+        do {                                    \
+                if (ucm_debug_level > 0)        \
+                        printk(KERN_DEBUG PFX format, ## arg); \
+        } while (0)
+
 static struct semaphore ctx_id_mutex;
 static struct idr       ctx_id_table;
 static int              ctx_id_rover = 0;
@@ -107,7 +120,7 @@ static void ib_ucm_ctx_put(struct ib_ucm_context *ctx)
 
         up(&ctx->file->mutex);
 
-        printk(KERN_ERR "UCM: Destroyed CM ID <%d>\n", ctx->id);
+        ucm_dbg("Destroyed CM ID <%d>\n", ctx->id);
 
         ib_destroy_cm_id(ctx->cm_id);
         kfree(ctx);
@@ -145,7 +158,7 @@ retry:
         if (result)
                 goto error;
 
-        printk(KERN_ERR "UCM: Allocated CM ID <%d>\n", ctx->id);
+        ucm_dbg("Allocated CM ID <%d>\n", ctx->id);
 
         return ctx;
 error:
@@ -378,10 +391,8 @@ static int ib_ucm_event_process(struct ib_cm_event *evt,
 
         return 0;
 error:
-        if (uvt->info)
-                kfree(uvt->info);
-        if (uvt->data)
-                kfree(uvt->data);
+        kfree(uvt->info);
+        kfree(uvt->data);
         return result;
 }
 
@@ -407,8 +418,7 @@ static int ib_ucm_event_handler(struct ib_cm_id *cm_id,
                 break;
         }
 
-        printk(KERN_ERR "UCM: Event. CM ID <%d> event <%d>\n",
-               id, event->event);
+        ucm_dbg("Event. CM ID <%d> event <%d>\n", id, event->event);
 
         ctx = ib_ucm_ctx_get(id);
         if (!ctx)
@@ -551,10 +561,8 @@ user:
         list_del(&uevent->file_list);
         list_del(&uevent->ctx_list);
 
-        if (uevent->data)
-                kfree(uevent->data);
-        if (uevent->info)
-                kfree(uevent->info);
+        kfree(uevent->data);
+        kfree(uevent->info);
         kfree(uevent);
 done:
         up(&file->mutex);
@@ -846,12 +854,9 @@ static ssize_t ib_ucm_send_req(struct ib_ucm_file *file,
         up(&ctx->file->mutex);
         ib_ucm_ctx_put(ctx); /* func reference */
 done:
-        if (param.private_data)
-                kfree(param.private_data);
-        if (param.primary_path)
-                kfree(param.primary_path);
-        if (param.alternate_path)
-                kfree(param.alternate_path);
+        kfree(param.private_data);
+        kfree(param.primary_path);
+        kfree(param.alternate_path);
 
         return result;
 }
@@ -900,8 +905,7 @@ static ssize_t ib_ucm_send_rep(struct ib_ucm_file *file,
         up(&ctx->file->mutex);
         ib_ucm_ctx_put(ctx); /* func reference */
 done:
-        if (param.private_data)
-                kfree(param.private_data);
+        kfree(param.private_data);
 
         return result;
 }
@@ -939,8 +943,7 @@ static ssize_t ib_ucm_send_private_data(struct ib_ucm_file *file,
         up(&ctx->file->mutex);
         ib_ucm_ctx_put(ctx); /* func reference */
 done:
-        if (private_data)
-                kfree(private_data);
+        kfree(private_data);
 
         return result;
 }
@@ -1009,10 +1012,8 @@ static ssize_t ib_ucm_send_info(struct ib_ucm_file *file,
         up(&ctx->file->mutex);
         ib_ucm_ctx_put(ctx); /* func reference */
 done:
-        if (data)
-                kfree(data);
-        if (info)
-                kfree(info);
+        kfree(data);
+        kfree(info);
 
         return result;
 }
@@ -1063,8 +1064,7 @@ static ssize_t ib_ucm_send_mra(struct ib_ucm_file *file,
         up(&ctx->file->mutex);
         ib_ucm_ctx_put(ctx); /* func reference */
 done:
-        if (data)
-                kfree(data);
+        kfree(data);
 
         return result;
 }
@@ -1105,10 +1105,8 @@ static ssize_t ib_ucm_send_lap(struct ib_ucm_file *file,
         up(&ctx->file->mutex);
         ib_ucm_ctx_put(ctx); /* func reference */
 done:
-        if (data)
-                kfree(data);
-        if (path)
-                kfree(path);
+        kfree(data);
+        kfree(path);
 
         return result;
 }
@@ -1157,10 +1155,8 @@ static ssize_t ib_ucm_send_sidr_req(struct ib_ucm_file *file,
         up(&ctx->file->mutex);
         ib_ucm_ctx_put(ctx); /* func reference */
 done:
-        if (param.private_data)
-                kfree(param.private_data);
-        if (param.path)
-                kfree(param.path);
+        kfree(param.private_data);
+        kfree(param.path);
 
         return result;
 }
@@ -1209,10 +1205,8 @@ static ssize_t ib_ucm_send_sidr_rep(struct ib_ucm_file *file,
         up(&ctx->file->mutex);
         ib_ucm_ctx_put(ctx); /* func reference */
 done:
-        if (param.private_data)
-                kfree(param.private_data);
-        if (param.info)
-                kfree(param.info);
+        kfree(param.private_data);
+        kfree(param.info);
 
         return result;
 }
@@ -1252,8 +1246,8 @@ static ssize_t ib_ucm_write(struct file *filp, const char __user *buf,
         if (copy_from_user(&hdr, buf, sizeof(hdr)))
                 return -EFAULT;
 
-        printk(KERN_ERR "UCM: Write. cmd <%d> in <%d> out <%d> len <%Zu>\n",
-               hdr.cmd, hdr.in, hdr.out, len);
+        ucm_dbg("Write. cmd <%d> in <%d> out <%d> len <%Zu>\n",
+                hdr.cmd, hdr.in, hdr.out, len);
 
         if (hdr.cmd < 0 || hdr.cmd >= ARRAY_SIZE(ucm_cmd_table))
                 return -EINVAL;
@@ -1300,7 +1294,7 @@ static int ib_ucm_open(struct inode *inode, struct file *filp)
         filp->private_data = file;
         file->filp = filp;
 
-        printk(KERN_ERR "UCM: Created struct\n");
+        ucm_dbg("Created struct\n");
 
         return 0;
 }
@@ -1326,7 +1320,7 @@ static int ib_ucm_close(struct inode *inode, struct file *filp)
 
         kfree(file);
 
-        printk(KERN_ERR "UCM: Deleted struct\n");
+        ucm_dbg("Deleted struct\n");
         return 0;
 }
 
@@ -1348,7 +1342,7 @@ static int __init ib_ucm_init(void)
 
         result = register_chrdev_region(IB_UCM_DEV, 1, "infiniband_cm");
         if (result) {
-                printk(KERN_ERR "UCM: Error <%d> registering dev\n", result);
+                ucm_dbg("Error <%d> registering dev\n", result);
                 goto err_chr;
         }
 
@@ -1356,14 +1350,14 @@ static int __init ib_ucm_init(void)
 
         result = cdev_add(&ib_ucm_cdev, IB_UCM_DEV, 1);
         if (result) {
-                printk(KERN_ERR "UCM: Error <%d> adding cdev\n", result);
+                ucm_dbg("Error <%d> adding cdev\n", result);
                 goto err_cdev;
         }
 
         ib_ucm_class = class_create(THIS_MODULE, "infiniband_cm");
         if (IS_ERR(ib_ucm_class)) {
                 result = PTR_ERR(ib_ucm_class);
-                printk(KERN_ERR "UCM: Error <%d> creating class\n", result);
+                ucm_dbg("Error <%d> creating class\n", result);
                 goto err_class;
         }