From: Jon Hunter Date: Fri, 1 Feb 2013 16:38:45 +0000 (-0600) Subject: ARM: OMAP2+: Prevent potential crash if GPMC probe fails X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=6797b4fe;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git ARM: OMAP2+: Prevent potential crash if GPMC probe fails If the GPMC probe fails, devices that use the GPMC (such as ethernet chips, flash memories, etc) can still allocate a GPMC chip-select and register the device. On the OMAP2420 H4 board, this was causing the kernel to crash after the gpmc probe failed and the board attempted to start networking. Prevent this by marking all the chip-selects as reserved by default and only make them available for devices to request if the GPMC probe succeeds. Signed-off-by: Jon Hunter Signed-off-by: Tony Lindgren --- diff --git a/arch/arm/mach-omap2/gpmc.c b/arch/arm/mach-omap2/gpmc.c index c6255f788ab2..0cf239231d36 100644 --- a/arch/arm/mach-omap2/gpmc.c +++ b/arch/arm/mach-omap2/gpmc.c @@ -150,7 +150,8 @@ static unsigned gpmc_irq_start; static struct resource gpmc_mem_root; static struct resource gpmc_cs_mem[GPMC_CS_NUM]; static DEFINE_SPINLOCK(gpmc_mem_lock); -static unsigned int gpmc_cs_map; /* flag for cs which are initialized */ +/* Define chip-selects as reserved by default until probe completes */ +static unsigned int gpmc_cs_map = ((1 << GPMC_CS_NUM) - 1); static struct device *gpmc_dev; static int gpmc_irq; static resource_size_t phys_base, mem_size; @@ -1123,6 +1124,9 @@ int gpmc_calc_timings(struct gpmc_timings *gpmc_t, /* TODO: remove, see function definition */ gpmc_convert_ps_to_ns(gpmc_t); + /* Now the GPMC is initialised, unreserve the chip-selects */ + gpmc_cs_map = 0; + return 0; }