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Commit 98f531b1 authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Greg Kroah-Hartman
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Drivers: hv: cleanup vmbus_open() for wrap around mappings 



In preparation for doing wrap around mappings for ring buffers cleanup
vmbus_open() function:
- check that ring sizes are PAGE_SIZE aligned (they are for all in-kernel
  drivers now);
- kfree(open_info) on error only after we kzalloc() it (not an issue as it
  is valid to call kfree(NULL);
- rename poorly named labels;
- use alloc_pages() instead of __get_free_pages() as we need struct page
  pointer for future.

Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Tested-by: default avatarDexuan Cui <decui@microsoft.com>
Signed-off-by: default avatarK. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7789e5a2

drivers/hv/channel.c

+22 −19
Original line number Diff line number Diff line
@@ -80,6 +80,10 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, 
	int ret, err = 0;

	struct page *page;



	if (send_ringbuffer_size % PAGE_SIZE ||

	    recv_ringbuffer_size % PAGE_SIZE)

		return -EINVAL;



	spin_lock_irqsave(&newchannel->lock, flags);

	if (newchannel->state == CHANNEL_OPEN_STATE) {

		newchannel->state = CHANNEL_OPENING_STATE;
@@ -99,17 +103,16 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, 
				recv_ringbuffer_size));



	if (!page)

		out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,

		page = alloc_pages(GFP_KERNEL|__GFP_ZERO,

				   get_order(send_ringbuffer_size +

					     recv_ringbuffer_size));

	else

		out = (void *)page_address(page);



	if (!out) {

	if (!page) {

		err = -ENOMEM;

		goto error0;

		goto error_set_chnstate;

	}



	out = page_address(page);

	in = (void *)((unsigned long)out + send_ringbuffer_size);



	newchannel->ringbuffer_pages = out;
@@ -121,14 +124,14 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, 


	if (ret != 0) {

		err = ret;

		goto error0;

		goto error_free_pages;

	}



	ret = hv_ringbuffer_init(

		&newchannel->inbound, in, recv_ringbuffer_size);

	if (ret != 0) {

		err = ret;

		goto error0;

		goto error_free_pages;

	}
@@ -143,7 +146,7 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, 


	if (ret != 0) {

		err = ret;

		goto error0;

		goto error_free_pages;

	}



	/* Create and init the channel open message */
@@ -152,7 +155,7 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, 
			   GFP_KERNEL);

	if (!open_info) {

		err = -ENOMEM;

		goto error_gpadl;

		goto error_free_gpadl;

	}



	init_completion(&open_info->waitevent);
@@ -168,7 +171,7 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, 


	if (userdatalen > MAX_USER_DEFINED_BYTES) {

		err = -EINVAL;

		goto error_gpadl;

		goto error_free_gpadl;

	}



	if (userdatalen)
@@ -184,7 +187,7 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, 


	if (ret != 0) {

		err = ret;

		goto error1;

		goto error_clean_msglist;

	}



	wait_for_completion(&open_info->waitevent);
@@ -195,25 +198,25 @@ int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, 


	if (open_info->response.open_result.status) {

		err = -EAGAIN;

		goto error_gpadl;

		goto error_free_gpadl;

	}



	newchannel->state = CHANNEL_OPENED_STATE;

	kfree(open_info);

	return 0;



error1:

error_clean_msglist:

	spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);

	list_del(&open_info->msglistentry);

	spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);



error_gpadl:

error_free_gpadl:

	vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle);



error0:

	kfree(open_info);

error_free_pages:

	free_pages((unsigned long)out,

		get_order(send_ringbuffer_size + recv_ringbuffer_size));

	kfree(open_info);

error_set_chnstate:

	newchannel->state = CHANNEL_OPEN_STATE;

	return err;

}