From 4b92894ee70c9110c083aa60b0663d357495864d Mon Sep 17 00:00:00 2001 From: Stephen Warren Date: Thu, 21 Nov 2013 16:11:15 -0700 Subject: [PATCH] spi: core: invert success test in devm_spi_register_master devres_add() should be called when the action to be undone succeeded, not when it failed. Fix the inverted test in devm_spi_register_master() which was doing the opposite. The user-visible issue without this fix is: insmod spi-tegra114.ko Assume there's an MTD device on that SPI bus, which creates /dev/mtd0. rmmod spi-tegra114 Doesn't remove devices on the SPI bus. insmod spi-tegra114.ko Creates a duplicate SPI device which creates /dev/mtd1. hexdump -C /dev/mtd0 That's the old device, which uses an SPI bus hosted by a non-existent module, which causes the oops below. Unable to handle kernel paging request at virtual address bf0017c0 pgd = c0004000 [bf0017c0] *pgd=ad51b811, *pte=00000000, *ppte=00000000 Internal error: Oops: 80000007 [#1] PREEMPT SMP ARM ... PC is at 0xbf0017c0 LR is at spi_pump_messages+0x15c/0x204 pc : [] lr : [] psr: 60000113 ... Fixes: 666d5b4c742b ("spi: core: Add devm_spi_register_master()") Signed-off-by: Stephen Warren Signed-off-by: Mark Brown --- drivers/spi/spi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 8d05accf706c..481e13f0db54 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1390,7 +1390,7 @@ int devm_spi_register_master(struct device *dev, struct spi_master *master) return -ENOMEM; ret = spi_register_master(master); - if (ret != 0) { + if (!ret) { *ptr = master; devres_add(dev, ptr); } else { -- 2.39.5