Patch "mtd: spi-nor: stm32-quadspi: Fix uninitialized error return code" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

mtd: spi-nor: stm32-quadspi: Fix uninitialized error return code

to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
mtd-spi-nor-stm32-quadspi-fix-uninitialized-error-return-code.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Geert Uytterhoeven <[email protected]>
Date: Thu, 26 Oct 2017 17:12:33 +0200
Subject: mtd: spi-nor: stm32-quadspi: Fix uninitialized error return code

From: Geert Uytterhoeven <[email protected]>

[ Upstream commit 05521bd3d117704a1458eb4d0c3ae821858658f2 ]

With gcc 4.1.2:

drivers/mtd/spi-nor/stm32-quadspi.c: In function ‘stm32_qspi_tx_poll’:
drivers/mtd/spi-nor/stm32-quadspi.c:230: warning: ‘ret’ may be used uninitialized in this function

Indeed, if stm32_qspi_cmd.len is zero, ret will be uninitialized. This length is passed from outside the driver using the spi_nor.{read,write}{,_reg}() callbacks.

Several functions in drivers/mtd/spi-nor/spi-nor.c (e.g. write_enable(), write_disable(), and erase_chip()) call spi_nor.write_reg() with a zero length.

Fix this by returning an explicit zero on success.

---
 drivers/mtd/spi-nor/stm32-quadspi.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

@@ -240,12 +240,12 @@ static int stm32_qspi_tx_poll(struct stm
 						 STM32_QSPI_FIFO_TIMEOUT_US);
 		if (ret) {
 			dev_err(qspi->dev, "fifo timeout (stat:%#x)\n", sr);
-			break;
+			return ret;
 		}
 		tx_fifo(buf++, qspi->io_base + QUADSPI_DR);
 	}
 
-	return ret;
+	return 0;
 }
 
 static int stm32_qspi_tx_mm(struct stm32_qspi *qspi,

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/fbdev-controlfb-add-missing-modes-to-fix-out-of-bounds-access.patch queue-4.14/mtd-spi-nor-stm32-quadspi-fix-uninitialized-error-return-code.patch