From: Wen Yang yellowriver2010@hotmail.com
commit a12085d13997ed15f745f33a0e01002541160179 upstream.
of_find_device_by_node() takes a reference to the struct device when it finds a match via get_device, there is no need to call get_device() twice. We also should make sure to drop the reference to the device taken by of_find_device_by_node() on driver unbind.
Fixes: f88fc122cc34 ("mtd: nand: Cleanup/rework the atmel_nand driver") Signed-off-by: Wen Yang yellowriver2010@hotmail.com Suggested-by: Boris Brezillon bbrezillon@kernel.org Reviewed-by: Boris Brezillon bbrezillon@kernel.org Reviewed-by: Miquel Raynal miquel.raynal@bootlin.com Acked-by: Miquel Raynal miquel.raynal@bootlin.com Cc: Tudor Ambarus tudor.ambarus@microchip.com Cc: Boris Brezillon bbrezillon@kernel.org Cc: Miquel Raynal miquel.raynal@bootlin.com Cc: Richard Weinberger richard@nod.at Cc: David Woodhouse dwmw2@infradead.org Cc: Brian Norris computersforpeace@gmail.com Cc: Marek Vasut marek.vasut@gmail.com Cc: Nicolas Ferre nicolas.ferre@microchip.com Cc: Alexandre Belloni alexandre.belloni@bootlin.com Cc: Ludovic Desroches ludovic.desroches@microchip.com Cc: linux-mtd@lists.infradead.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Signed-off-by: Lee Jones lee.jones@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/mtd/nand/atmel/pmecc.c | 21 +++++++++++++++------ 1 file changed, 15 insertions(+), 6 deletions(-)
--- a/drivers/mtd/nand/atmel/pmecc.c +++ b/drivers/mtd/nand/atmel/pmecc.c @@ -875,23 +875,32 @@ static struct atmel_pmecc *atmel_pmecc_g { struct platform_device *pdev; struct atmel_pmecc *pmecc, **ptr; + int ret;
pdev = of_find_device_by_node(np); - if (!pdev || !platform_get_drvdata(pdev)) + if (!pdev) return ERR_PTR(-EPROBE_DEFER); + pmecc = platform_get_drvdata(pdev); + if (!pmecc) { + ret = -EPROBE_DEFER; + goto err_put_device; + }
ptr = devres_alloc(devm_atmel_pmecc_put, sizeof(*ptr), GFP_KERNEL); - if (!ptr) - return ERR_PTR(-ENOMEM); - - get_device(&pdev->dev); - pmecc = platform_get_drvdata(pdev); + if (!ptr) { + ret = -ENOMEM; + goto err_put_device; + }
*ptr = pmecc;
devres_add(userdev, ptr);
return pmecc; + +err_put_device: + put_device(&pdev->dev); + return ERR_PTR(ret); }
static const int atmel_pmecc_strengths[] = { 2, 4, 8, 12, 24, 32 };