X-Git-Url: https://git.proxmox.com/?a=blobdiff_plain;f=drivers%2Fspi%2Fspi.c;h=91e76c776037b7d3ad4d02b7f6dac9f9b4731344;hb=c1f9c2ad659c73eb019dc438043f39bd5ed9987d;hp=b33a727a0158b19ebae1364a21fd8c9dff22e4e5;hpb=64a48099b3b31568ac45716b7fafcb74a0c2fcfe;p=mirror_ubuntu-bionic-kernel.git

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index b33a727a0158..91e76c776037 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -779,8 +779,14 @@ static int spi_map_buf(struct spi_controller *ctlr, struct device *dev,
 	for (i = 0; i < sgs; i++) {
 
 		if (vmalloced_buf || kmap_buf) {
-			min = min_t(size_t,
-				    len, desc_len - offset_in_page(buf));
+			/*
+			 * Next scatterlist entry size is the minimum between
+			 * the desc_len and the remaining buffer length that
+			 * fits in a page.
+			 */
+			min = min_t(size_t, desc_len,
+				    min_t(size_t, len,
+					  PAGE_SIZE - offset_in_page(buf)));
 			if (vmalloced_buf)
 				vm_page = vmalloc_to_page(buf);
 			else
@@ -1216,6 +1222,7 @@ static void __spi_pump_messages(struct spi_controller *ctlr, bool in_kthread)
 	if (!was_busy && ctlr->auto_runtime_pm) {
 		ret = pm_runtime_get_sync(ctlr->dev.parent);
 		if (ret < 0) {
+			pm_runtime_put_noidle(ctlr->dev.parent);
 			dev_err(&ctlr->dev, "Failed to power device: %d\n",
 				ret);
 			mutex_unlock(&ctlr->io_mutex);
@@ -2254,12 +2261,6 @@ void spi_unregister_controller(struct spi_controller *ctlr)
 	mutex_lock(&board_lock);
 	found = idr_find(&spi_master_idr, id);
 	mutex_unlock(&board_lock);
-	if (found != ctlr) {
-		dev_dbg(&ctlr->dev,
-			"attempting to delete unregistered controller [%s]\n",
-			dev_name(&ctlr->dev));
-		return;
-	}
 	if (ctlr->queued) {
 		if (spi_destroy_queue(ctlr))
 			dev_err(&ctlr->dev, "queue remove failed\n");
@@ -2272,7 +2273,8 @@ void spi_unregister_controller(struct spi_controller *ctlr)
 	device_unregister(&ctlr->dev);
 	/* free bus id */
 	mutex_lock(&board_lock);
-	idr_remove(&spi_master_idr, id);
+	if (found == ctlr)
+		idr_remove(&spi_master_idr, id);
 	mutex_unlock(&board_lock);
 }
 EXPORT_SYMBOL_GPL(spi_unregister_controller);