• Russell King's avatar
    ARM: OMAP: use consistent error checking · c48cd659
    Russell King authored
    Consistently check errors using the usual method used in the kernel
    for much of its history.  For instance:
    
    int gpmc_cs_set_timings(int cs, const struct gpmc_timings *t)
    {
    	int div;
    	div = gpmc_calc_divider(t->sync_clk);
    	if (div < 0)
    		return div;
    static int gpmc_set_async_mode(int cs, struct gpmc_timings *t)
    {
    ...
    	return gpmc_cs_set_timings(cs, t);
    
    .....
    	ret = gpmc_set_async_mode(gpmc_onenand_data->cs, &t);
    	if (IS_ERR_VALUE(ret))
    		return ret;
    
    So, gpmc_cs_set_timings() thinks any negative return value is an error,
    but where we check that in higher levels, only a limited range are
    errors...
    
    There is only _one_ use of IS_ERR_VALUE() in arch/arm which is really
    appropriate, and that is in arch/arm/include/asm/syscall.h:
    
    static inline long syscall_get_error(struct task_struct *task,
    				     struct pt_regs *regs)
    {
    	unsigned long error = regs->ARM_r0;
    	return IS_ERR_VALUE(error) ? error : 0;
    }
    
    because this function really does have to differentiate between error
    return values and addresses which look like negative numbers (eg, from
    mmap()).
    
    So, here's a patch to remove them from OMAP, except for the above.
    Acked-by: default avatarTony Lindgren <tony@atomide.com>
    Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
    c48cd659
gpmc.c 32.4 KB