On 10/29/2014 09:38 AM, Daniel Thompson wrote: > Currently the _dm RX handler detects breaks but does not pass any > characters to uart_handle_sysrq_char(). > > The _dm optimizations combined with the port's spin lock make if > difficult to pass all characters to the sysrq logic because we cannot > safely call uart_handle_sysrq_char() when the lock is held without > deadlock (the console handler also takes the lock). > > Rather than passing all characters via uart_handle_sysrq_char() this patch > only passes the last few characters in the FIFO. This should include all > characters typed as a slow (human) rate. This makes the problem much > simpler and allows us to move the handling of these characters outside > of the port lock. This makes magic SysRq work if there is a human at > the keyboard (or a short delay in a script). > > Signed-off-by: Daniel Thompson <daniel.thompson@xxxxxxxxxx> > --- I have a patch that I was going to send for this (Frank R. and I have been looking at it since a month or two ago). This patch doesn't look correct given that the SR register is not actually accurate and doesn't indicate that a break is there in the fifo. I'll Cc you on the patch, please test it. -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
