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authorVitaly Kuznetsov <vkuznets@redhat.com>2016-09-02 15:58:19 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-09-02 18:22:51 +0300
commit98f531b10d23e3c28e8d34c0e88822a81231b3c2 (patch)
tree1865a01afd742dedea81ee61fadfe0ec4f6456c9 /drivers/hv/channel.c
parent7789e5a2accdbc5d506405c11ef4e5469440e96b (diff)
downloadlinux-98f531b10d23e3c28e8d34c0e88822a81231b3c2.tar.xz
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: 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>
Diffstat (limited to 'drivers/hv/channel.c')
-rw-r--r--drivers/hv/channel.c41
1 files changed, 22 insertions, 19 deletions
diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 884cebf5f9b9..15e833004fc3 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -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;
}