usb: core: Replace in_interrupt() in comments

The usage of in_interrupt() in drivers is phased out for various reasons.

Various comments use !in_interrupt() to describe calling context for
functions which might sleep. That's wrong because the calling context has
to be preemptible task context, which is not what !in_interrupt()
describes.

Replace !in_interrupt() with more accurate plain text descriptions.

The comment for usb_hcd_poll_rh_status() is misleading as this function is
called from all kinds of contexts including preemptible task
context. Remove it as there is obviously no restriction.

Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Cc: linux-usb@vger.kernel.org
Link: https://lore.kernel.org/r/20201019101110.851821025@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 22 insertions, 13 deletions

diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 19ebb542befc..c4e876050074 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -119,7 +119,7 @@ static int usb_internal_control_msg(struct usb_device *usb_dev,
  * @timeout: time in msecs to wait for the message to complete before timing
  *	out (if 0 the wait is forever)
  *
- * Context: !in_interrupt ()
+ * Context: task context, might sleep.
  *
  * This function sends a simple control message to a specified endpoint and
  * waits for the message to complete, or timeout.
@@ -310,7 +310,7 @@ EXPORT_SYMBOL_GPL(usb_control_msg_recv);
  * @timeout: time in msecs to wait for the message to complete before
  *	timing out (if 0 the wait is forever)
  *
- * Context: !in_interrupt ()
+ * Context: task context, might sleep.
  *
  * This function sends a simple interrupt message to a specified endpoint and
  * waits for the message to complete, or timeout.
@@ -343,7 +343,7 @@ EXPORT_SYMBOL_GPL(usb_interrupt_msg);
  * @timeout: time in msecs to wait for the message to complete before
  *	timing out (if 0 the wait is forever)
  *
- * Context: !in_interrupt ()
+ * Context: task context, might sleep.
  *
  * This function sends a simple bulk message to a specified endpoint
  * and waits for the message to complete, or timeout.
@@ -610,7 +610,8 @@ EXPORT_SYMBOL_GPL(usb_sg_init);
  * usb_sg_wait - synchronously execute scatter/gather request
  * @io: request block handle, as initialized with usb_sg_init().
  * 	some fields become accessible when this call returns.
- * Context: !in_interrupt ()
+ *
+ * Context: task context, might sleep.
  *
  * This function blocks until the specified I/O operation completes.  It
  * leverages the grouping of the related I/O requests to get good transfer
@@ -764,7 +765,8 @@ EXPORT_SYMBOL_GPL(usb_sg_cancel);
  * @index: the number of the descriptor
  * @buf: where to put the descriptor
  * @size: how big is "buf"?
- * Context: !in_interrupt ()
+ *
+ * Context: task context, might sleep.
  *
  * Gets a USB descriptor.  Convenience functions exist to simplify
  * getting some types of descriptors.  Use
@@ -812,7 +814,8 @@ EXPORT_SYMBOL_GPL(usb_get_descriptor);
  * @index: the number of the descriptor
  * @buf: where to put the string
  * @size: how big is "buf"?
- * Context: !in_interrupt ()
+ *
+ * Context: task context, might sleep.
  *
  * Retrieves a string, encoded using UTF-16LE (Unicode, 16 bits per character,
  * in little-endian byte order).
@@ -947,7 +950,8 @@ static int usb_get_langid(struct usb_device *dev, unsigned char *tbuf)
  * @index: the number of the descriptor
  * @buf: where to put the string
  * @size: how big is "buf"?
- * Context: !in_interrupt ()
+ *
+ * Context: task context, might sleep.
  *
  * This converts the UTF-16LE encoded strings returned by devices, from
  * usb_get_string_descriptor(), to null-terminated UTF-8 encoded ones
@@ -1036,7 +1040,8 @@ char *usb_cache_string(struct usb_device *udev, int index)
  * usb_get_device_descriptor - (re)reads the device descriptor (usbcore)
  * @dev: the device whose device descriptor is being updated
  * @size: how much of the descriptor to read
- * Context: !in_interrupt ()
+ *
+ * Context: task context, might sleep.
  *
  * Updates the copy of the device descriptor stored in the device structure,
  * which dedicates space for this purpose.
@@ -1071,7 +1076,7 @@ int usb_get_device_descriptor(struct usb_device *dev, unsigned int size)
 /*
  * usb_set_isoch_delay - informs the device of the packet transmit delay
  * @dev: the device whose delay is to be informed
- * Context: !in_interrupt()
+ * Context: task context, might sleep
  *
  * Since this is an optional request, we don't bother if it fails.
  */
@@ -1100,7 +1105,8 @@ int usb_set_isoch_delay(struct usb_device *dev)
  * @type: USB_STATUS_TYPE_*; for standard or PTM status types
  * @target: zero (for device), else interface or endpoint number
  * @data: pointer to two bytes of bitmap data
- * Context: !in_interrupt ()
+ *
+ * Context: task context, might sleep.
  *
  * Returns device, interface, or endpoint status.  Normally only of
  * interest to see if the device is self powered, or has enabled the
@@ -1177,7 +1183,8 @@ EXPORT_SYMBOL_GPL(usb_get_status);
  * usb_clear_halt - tells device to clear endpoint halt/stall condition
  * @dev: device whose endpoint is halted
  * @pipe: endpoint "pipe" being cleared
- * Context: !in_interrupt ()
+ *
+ * Context: task context, might sleep.
  *
  * This is used to clear halt conditions for bulk and interrupt endpoints,
  * as reported by URB completion status.  Endpoints that are halted are
@@ -1481,7 +1488,8 @@ void usb_enable_interface(struct usb_device *dev,
  * @dev: the device whose interface is being updated
  * @interface: the interface being updated
  * @alternate: the setting being chosen.
- * Context: !in_interrupt ()
+ *
+ * Context: task context, might sleep.
  *
  * This is used to enable data transfers on interfaces that may not
  * be enabled by default.  Not all devices support such configurability.
@@ -1902,7 +1910,8 @@ static void __usb_queue_reset_device(struct work_struct *ws)
  * usb_set_configuration - Makes a particular device setting be current
  * @dev: the device whose configuration is being updated
  * @configuration: the configuration being chosen.
- * Context: !in_interrupt(), caller owns the device lock
+ *
+ * Context: task context, might sleep. Caller holds device lock.
  *
  * This is used to enable non-default device modes.  Not all devices
  * use this kind of configurability; many devices only have one