From a32b0e7851320cba0144d20e87e5326ee81e1063 Mon Sep 17 00:00:00 2001 From: Gabor Juhos Date: Tue, 5 Feb 2013 20:57:55 +0100 Subject: [PATCH] spi/ath79: add shutdown handler commit 7410e848583f9120dd5f9414629f01bb76b5ee5f upstream. The SPI controller of the AR7xxx/AR9xxx SoCs have a special mode which allows the SoC to directly read data from SPI flash chips. In this mode, the content of the SPI flash chip can be accessed via a memory mapped region. During early init time, the kernel expects that the flash chip is accessible through that memory region because it reads board specific values (e.g. MAC address, WiFi calibration data) from the flash on various boards. This is working if the kernel is loaded directly by the bootloader because that leaves the SPI controller in the special mode. However it is not working in a kexec'd kernel because the SPI driver does not restore the special mode during shutdown. The patch adds a shutdown handler to fix this issue. Signed-off-by: Gabor Juhos Signed-off-by: Grant Likely --- drivers/spi/spi-ath79.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/spi/spi-ath79.c +++ b/drivers/spi/spi-ath79.c @@ -308,9 +308,15 @@ static int ath79_spi_remove(struct platf return 0; } +static void ath79_spi_shutdown(struct platform_device *pdev) +{ + ath79_spi_remove(pdev); +} + static struct platform_driver ath79_spi_driver = { .probe = ath79_spi_probe, .remove = ath79_spi_remove, + .shutdown = ath79_spi_shutdown, .driver = { .name = DRV_NAME, .owner = THIS_MODULE,