Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 32baf8e..bb4cc49 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -12,6 +12,11 @@
/**
* virtio_config_ops - operations for configuring a virtio device
+ * Note: Do not assume that a transport implements all of the operations
+ * getting/setting a value as a simple read/write! Generally speaking,
+ * any of @get/@set, @get_status/@set_status, or @get_features/
+ * @finalize_features are NOT safe to be called from an atomic
+ * context.
* @get: read the value of a configuration field
* vdev: the virtio_device
* offset: the offset of the configuration field
@@ -22,7 +27,7 @@
* offset: the offset of the configuration field
* buf: the buffer to read the field value from.
* len: the length of the buffer
- * @generation: config generation counter
+ * @generation: config generation counter (optional)
* vdev: the virtio_device
* Returns the config generation counter
* @get_status: read the status byte
@@ -48,17 +53,17 @@
* @del_vqs: free virtqueues found by find_vqs().
* @get_features: get the array of feature bits for this device.
* vdev: the virtio_device
- * Returns the first 32 feature bits (all we currently need).
+ * Returns the first 64 feature bits (all we currently need).
* @finalize_features: confirm what device features we'll be using.
* vdev: the virtio_device
* This gives the final feature bits for the device: it can change
* the dev->feature bits if it wants.
* Returns 0 on success or error status
- * @bus_name: return the bus name associated with the device
+ * @bus_name: return the bus name associated with the device (optional)
* vdev: the virtio_device
* This returns a pointer to the bus name a la pci_name from which
* the caller can then copy.
- * @set_vq_affinity: set the affinity for a virtqueue.
+ * @set_vq_affinity: set the affinity for a virtqueue (optional).
* @get_vq_affinity: get the affinity for a virtqueue (optional).
*/
typedef void vq_callback_t(struct virtqueue *);
@@ -285,6 +290,7 @@
/* Config space accessors. */
#define virtio_cread(vdev, structname, member, ptr) \
do { \
+ might_sleep(); \
/* Must match the member's type, and be integer */ \
if (!typecheck(typeof((((structname*)0)->member)), *(ptr))) \
(*ptr) = 1; \
@@ -314,6 +320,7 @@
/* Config space accessors. */
#define virtio_cwrite(vdev, structname, member, ptr) \
do { \
+ might_sleep(); \
/* Must match the member's type, and be integer */ \
if (!typecheck(typeof((((structname*)0)->member)), *(ptr))) \
BUG_ON((*ptr) == 1); \
@@ -353,6 +360,7 @@
vdev->config->generation(vdev) : 0;
int i;
+ might_sleep();
do {
old = gen;
@@ -375,6 +383,8 @@
static inline u8 virtio_cread8(struct virtio_device *vdev, unsigned int offset)
{
u8 ret;
+
+ might_sleep();
vdev->config->get(vdev, offset, &ret, sizeof(ret));
return ret;
}
@@ -382,6 +392,7 @@
static inline void virtio_cwrite8(struct virtio_device *vdev,
unsigned int offset, u8 val)
{
+ might_sleep();
vdev->config->set(vdev, offset, &val, sizeof(val));
}
@@ -389,6 +400,8 @@
unsigned int offset)
{
u16 ret;
+
+ might_sleep();
vdev->config->get(vdev, offset, &ret, sizeof(ret));
return virtio16_to_cpu(vdev, (__force __virtio16)ret);
}
@@ -396,6 +409,7 @@
static inline void virtio_cwrite16(struct virtio_device *vdev,
unsigned int offset, u16 val)
{
+ might_sleep();
val = (__force u16)cpu_to_virtio16(vdev, val);
vdev->config->set(vdev, offset, &val, sizeof(val));
}
@@ -404,6 +418,8 @@
unsigned int offset)
{
u32 ret;
+
+ might_sleep();
vdev->config->get(vdev, offset, &ret, sizeof(ret));
return virtio32_to_cpu(vdev, (__force __virtio32)ret);
}
@@ -411,6 +427,7 @@
static inline void virtio_cwrite32(struct virtio_device *vdev,
unsigned int offset, u32 val)
{
+ might_sleep();
val = (__force u32)cpu_to_virtio32(vdev, val);
vdev->config->set(vdev, offset, &val, sizeof(val));
}
@@ -426,6 +443,7 @@
static inline void virtio_cwrite64(struct virtio_device *vdev,
unsigned int offset, u64 val)
{
+ might_sleep();
val = (__force u64)cpu_to_virtio64(vdev, val);
vdev->config->set(vdev, offset, &val, sizeof(val));
}