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linux-stable/drivers/tty
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Sebastian Andrzej Siewior 0aa525d118 tty: serial: 8250_core: read only RX if there is something in the FIFO 
The serial8250_do_startup() function unconditionally clears the
interrupts and for that it reads from the RX-FIFO without checking if
there is a byte in the FIFO or not. This works fine on OMAP4+ HW like
AM335x or DRA7.
OMAP3630 ES1.1 (which means probably all OMAP3 and earlier) does not like
this:

|Unhandled fault: external abort on non-linefetch (0x1028) at 0xfb020000
|Internal error: : 1028 [#1] ARM
|Modules linked in:
|CPU: 0 PID: 1 Comm: swapper Not tainted 3.16.0-00022-g7edcb57-dirty #1213
|task: de0572c0 ti: de058000 task.ti: de058000
|PC is at mem32_serial_in+0xc/0x1c
|LR is at serial8250_do_startup+0x220/0x85c
|Flags: nzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
|Control: 10c5387d  Table: 80004019  DAC: 00000015
|[<c03051d4>] (mem32_serial_in) from [<c0307fe8>] (serial8250_do_startup+0x220/0x85c)
|[<c0307fe8>] (serial8250_do_startup) from [<c0309e00>] (omap_8250_startup+0x5c/0xe0)
|[<c0309e00>] (omap_8250_startup) from [<c030863c>] (serial8250_startup+0x18/0x2c)
|[<c030863c>] (serial8250_startup) from [<c030394c>] (uart_startup+0x78/0x1d8)
|[<c030394c>] (uart_startup) from [<c0304678>] (uart_open+0xe8/0x114)
|[<c0304678>] (uart_open) from [<c02e9e10>] (tty_open+0x1a8/0x5a4)

Reviewed-by: Tony Lindgren <tony@atomide.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-09-26 18:01:56 +02:00
..
hvc tty: Update hypervisor tty drivers to use core stdout parsing code. 2014-06-26 17:12:23 +01:00
ipwireless tty: ipwireless: Remove tty->closing abort from ipw_open() 2014-07-10 16:06:49 -07:00
serial tty: serial: 8250_core: read only RX if there is something in the FIFO 2014-09-26 18:01:56 +02:00
vt tty/vt/keyboard: Resolve many shadow warnings 2014-09-08 16:30:43 -07:00
amiserial.c tty/amiserial: avoid interruptible_sleep_on 2014-01-07 17:05:21 -08:00
bfin_jtag_comm.c
cyclades.c tty: Remove tty_hung_up_p() tests from tty drivers' open() 2014-07-10 16:06:49 -07:00
ehv_bytechan.c tty: Update hypervisor tty drivers to use core stdout parsing code. 2014-06-26 17:12:23 +01:00
goldfish.c goldfish: clean up the checkpatch warnings 2014-05-15 13:20:42 -07:00
isicom.c
Kconfig drivers/tty: ehv_bytechan fails to build as a module 2014-01-09 17:52:12 -06:00
Makefile
metag_da.c
moxa.c TTY: fix decimal printf format specifiers prefixed with 0x 2014-09-08 15:51:35 -07:00
moxa.h
mxser.c
mxser.h
n_gsm.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-08-06 09:38:14 -07:00
n_hdlc.c drivers/tty/n_hdlc.c: replace kmalloc/memset by kzalloc 2014-05-28 13:33:18 -07:00
n_r3964.c
n_tracerouter.c
n_tracesink.c
n_tracesink.h
n_tty.c tty: Fix spurious poll() wakeups 2014-09-08 15:55:25 -07:00
nozomi.c drivers/tty/nozomi.c: Use 'nozomi_setup_memory' instead of 'setup_memory' 2014-09-08 16:09:23 -07:00
pty.c tty: Move packet mode flow control notifications to pty driver 2014-09-23 21:19:35 -07:00
rocket.c
rocket.h
rocket_int.h
synclink.c tty: Remove tty_hung_up_p() tests from tty drivers' open() 2014-07-10 16:06:49 -07:00
synclink_gt.c synclink_gt: use pci_zalloc_consistent 2014-08-08 15:57:30 -07:00
synclinkmp.c tty: Remove tty_hung_up_p() tests from tty drivers' open() 2014-07-10 16:06:49 -07:00
sysrq.c mm, oom: ensure memoryless node zonelist always includes zones 2014-08-06 18:01:21 -07:00
tty_audit.c audit: anchor all pid references in the initial pid namespace 2014-03-20 10:11:55 -04:00
tty_buffer.c Staging: speakup: Update __speakup_paste_selection() tty (ab)usage to match vt 2014-05-24 02:25:11 +09:00
tty_io.c tty: Move and rename send_prio_char() as tty_send_xchar() 2014-09-23 21:19:35 -07:00
tty_ioctl.c tty: Hold termios_rwsem for tcflow(TCIxxx) 2014-09-23 21:19:36 -07:00
tty_ldisc.c tty: delete non-required instances of include <linux/init.h> 2014-01-07 17:05:21 -08:00
tty_ldsem.c lockdep: Make held_lock->check and "int check" argument bool 2014-02-09 21:18:54 +01:00
tty_mutex.c
tty_port.c tty: Remove tty_hung_up_p() tests from tty drivers' open() 2014-07-10 16:06:49 -07:00