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Drivers: hv: cleanup vmbus_open() for wrap around mappings

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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: Vitaly Kuznetsov <vkuznets@redhat.com>
Tested-by: Dexuan Cui <decui@microsoft.com>
Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vitaly Kuznetsov 2016-09-02 05:58:19 -07:00 committed by Greg Kroah-Hartman
parent 7789e5a2ac
commit 98f531b10d
1 changed files with 22 additions and 19 deletions
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41
drivers/hv/channel.c
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@ -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,
get_order(send_ringbuffer_size +
recv_ringbuffer_size));
else
out = (void *)page_address(page);
page = alloc_pages(GFP_KERNEL|__GFP_ZERO,
get_order(send_ringbuffer_size +
recv_ringbuffer_size));
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;
}