From: Soren Brinkmann <soren.brinkmann@xilinx.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>
Cc: Michal Simek <michal.simek@xilinx.com>,
<linux-serial@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>,
"Soren Brinkmann" <soren.brinkmann@xilinx.com>
Subject: [PATH RESEND v2 00/10] tty: xuartps: Fix lock ups
Date: Thu, 19 Nov 2015 12:02:14 -0800 [thread overview]
Message-ID: <1447963344-16266-1-git-send-email-soren.brinkmann@xilinx.com> (raw)
Hi,
I guess this series got probably lost during the merge window. Hence, I
resend the patches.
This is v2, hopefully without any build issues. The changes are the same
as before, just the warning reported by kbuild test robot about unused
variables have been fixed. And, I added one more patch with some
cleanup/refactoring.
I recently found my system locking up under some conditions. I dug
through the code a bit and the result is this collections of various
changes. Some of it may not be required and has just been created out of
half-baked theories and re-reading the documentation. The actual failing
scenarios seem to be:
- RX IRQ conditions are handled while the receiver is disabled, leaving
the driver in an infinite loop
- console_put_char seems to be interrupted by uart_shutdown disabling
the transmitter while/just before printing
I.e. overall I tried to serialize all operations using the port lock to
avoid such interaction.
Thanks,
Sören
Sören Brinkmann (10):
tty: xuartps: Beautify read-modify writes
tty: xuartps: Use spinlock to serialize HW access
tty: xuartps: Always enable transmitter in start_tx
tty: xuartps: Clear interrupt status register in shutdown
tty: xuartps: Improve startup function
tty: xuartps: Keep lock for whole ISR
tty: xuartps: Acquire port lock for shutdown
tty: xuartps: Move RX path into helper function
tty: xuartps: Only handle RX IRQs when RX is enabled
tty: xuartps: Cleanup: Reformat if-else
drivers/tty/serial/xilinx_uartps.c | 247 ++++++++++++++++++++-----------------
1 file changed, 136 insertions(+), 111 deletions(-)
--
2.6.3.3.g9bb996a
next reply other threads:[~2015-11-19 20:15 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-19 20:02 Soren Brinkmann [this message]
2015-11-19 20:02 ` [PATH RESEND v2 01/10] tty: xuartps: Beautify read-modify writes Soren Brinkmann
2015-11-19 20:02 ` [PATH RESEND v2 02/10] tty: xuartps: Use spinlock to serialize HW access Soren Brinkmann
2015-11-19 20:02 ` [PATH RESEND v2 03/10] tty: xuartps: Always enable transmitter in start_tx Soren Brinkmann
2015-11-20 12:13 ` Peter Hurley
2015-11-20 15:28 ` Sören Brinkmann
2015-11-20 16:30 ` Peter Hurley
2015-11-20 16:58 ` Sören Brinkmann
2015-11-20 17:16 ` Peter Hurley
2015-11-20 17:29 ` Sören Brinkmann
2015-11-23 7:05 ` Michal Simek
2015-11-23 20:00 ` Peter Hurley
2015-11-24 7:26 ` Michal Simek
2015-11-20 17:05 ` Sören Brinkmann
2015-11-20 17:12 ` Peter Hurley
2015-11-19 20:02 ` [PATH RESEND v2 04/10] tty: xuartps: Clear interrupt status register in shutdown Soren Brinkmann
2015-11-19 20:02 ` [PATH RESEND v2 05/10] tty: xuartps: Improve startup function Soren Brinkmann
2015-11-19 20:02 ` [PATH RESEND v2 06/10] tty: xuartps: Keep lock for whole ISR Soren Brinkmann
2015-11-19 20:02 ` [PATH RESEND v2 07/10] tty: xuartps: Acquire port lock for shutdown Soren Brinkmann
2015-11-19 20:02 ` [PATH RESEND v2 08/10] tty: xuartps: Move RX path into helper function Soren Brinkmann
2015-11-19 20:02 ` [PATH RESEND v2 09/10] tty: xuartps: Only handle RX IRQs when RX is enabled Soren Brinkmann
2015-11-19 20:02 ` [PATH RESEND v2 10/10] tty: xuartps: Cleanup: Reformat if-else Soren Brinkmann
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