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Commit 79d81907 authored by Hal Rosenstock's avatar Hal Rosenstock Committed by Roland Dreier
Browse files

[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: default avatarHal Rosenstock <halr@voltaire.com>
Signed-off-by: default avatarLibor Michalek <libor@topspin.com>
parent 2868bd28

drivers/infiniband/core/ucm.c

+41 −47
Original line number Diff line number Diff line
@@ -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 @@ static struct ib_ucm_context *ib_ucm_ctx_alloc(struct ib_ucm_file *file) 
	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:
@@ -378,9 +391,7 @@ 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);

	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)
@@ -551,9 +561,7 @@ static ssize_t ib_ucm_event(struct ib_ucm_file *file, 
	list_del(&uevent->file_list);

	list_del(&uevent->ctx_list);



	if (uevent->data)

	kfree(uevent->data);

	if (uevent->info)

	kfree(uevent->info);

	kfree(uevent);

done:
@@ -846,11 +854,8 @@ 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);



	return result;
@@ -900,7 +905,6 @@ 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);



	return result;
@@ -939,7 +943,6 @@ 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);



	return result;
@@ -1009,9 +1012,7 @@ 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);



	return result;
@@ -1063,7 +1064,6 @@ 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);



	return result;
@@ -1105,9 +1105,7 @@ 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);



	return result;
@@ -1157,9 +1155,7 @@ 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);



	return result;
@@ -1209,9 +1205,7 @@ 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);



	return result;
@@ -1252,7 +1246,7 @@ 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",

	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))
@@ -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;

	}