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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 <jon-hunter@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Jon Hunter 2013-02-01 10:38:45 -06:00 committed by Tony Lindgren
parent a16723709c
commit 6797b4fe0e
1 changed files with 5 additions and 1 deletions
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6
arch/arm/mach-omap2/gpmc.c
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@ -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;
}