[PATCH 32/58] mtd: rawnand: fsmc: retain open-handle state on removal

[James Hilliard]

Keep chip metadata and controller storage alive until the final MTD
reference is released. Unregister and disconnect each published chip
before releasing the resources used by its hardware operations.

Disconnect before controller disable and DMA channel release.

Signed-off-by: James Hilliard <james.hilliard1 at gmail.com>
---
 drivers/mtd/nand/raw/fsmc_nand.c | 22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/raw/fsmc_nand.c b/drivers/mtd/nand/raw/fsmc_nand.c
index 0b1817cdfc5a..ef0738c4cca1 100644
--- a/drivers/mtd/nand/raw/fsmc_nand.c
+++ b/drivers/mtd/nand/raw/fsmc_nand.c
@@ -1024,6 +1024,11 @@ static void fsmc_nand_disable(struct fsmc_nand_data *host)
  * fsmc_nand_probe - Probe function
  * @pdev:       platform device structure
  */
+static void fsmc_nand_release(struct nand_controller *controller)
+{
+	kfree(container_of(controller, struct fsmc_nand_data, base));
+}
+
 static int __init fsmc_nand_probe(struct platform_device *pdev)
 {
 	struct fsmc_nand_data *host;
@@ -1037,9 +1042,12 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 	int i;
 
 	/* Allocate memory for the device structure (and zero it) */
-	host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
+	host = kzalloc_obj(*host);
 	if (!host)
 		return -ENOMEM;
+	ret = devm_nand_controller_init(&pdev->dev, &host->base, fsmc_nand_release);
+	if (ret)
+		return ret;
 
 	nand = &host->nand;
 
@@ -1128,7 +1136,6 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 		nand->options |= NAND_KEEP_TIMINGS;
 	}
 
-	nand_controller_init(&host->base);
 	host->base.ops = &fsmc_nand_controller_ops;
 	nand->controller = &host->base;
 
@@ -1140,9 +1147,15 @@ static int __init fsmc_nand_probe(struct platform_device *pdev)
 		goto release_dma_write_chan;
 
 	mtd->name = "nand";
-	ret = mtd_device_register(mtd, NULL, 0);
+	ret = nand_set_release(nand, NULL);
 	if (ret)
 		goto cleanup_nand;
+	ret = mtd_device_register(mtd, NULL, 0);
+	if (ret) {
+		nand_disconnect(nand);
+		mtd_put_master(mtd);
+		goto release_dma_write_chan;
+	}
 
 	platform_set_drvdata(pdev, host);
 	dev_info(&pdev->dev, "FSMC NAND driver registration successful\n");
@@ -1176,13 +1189,14 @@ static void fsmc_nand_remove(struct platform_device *pdev)
 
 		ret = mtd_device_unregister(nand_to_mtd(chip));
 		WARN_ON(ret);
-		nand_cleanup(chip);
+		nand_disconnect(chip);
 		fsmc_nand_disable(host);
 
 		if (host->mode == USE_DMA_ACCESS) {
 			dma_release_channel(host->write_dma_chan);
 			dma_release_channel(host->read_dma_chan);
 		}
+		mtd_put_master(nand_to_mtd(chip));
 	}
 }
 

-- 
2.53.0