[PATCH v4 00/21] OMAP UART Patches

Kevin Hilman khilman at deeprootsystems.com
Thu Sep 6 18:44:13 EDT 2012

Felipe Balbi <balbi at ti.com> writes:

> Hi guys,
> here's v4 of the omap uart patchset. No changes other than a rebase on top of
> Greg's tty-next branch and Tony's Acked-by being added to a couple patches
> Note: I'm resending the series with Vikram's Software Flow Control fix anyway
> as it can just be ignored if it's decided it needs to go into this merge
> window.

Sorry to be late to the party... just getting back from some time off.

I'm assuming that this was not tested with PM, so decided I better do it
myself seeing that Greg is has already merge it.  To test, I merged
Greg's tty-next branch with v3.6-rc4 and did some PM testing.

The bad news is that it doesn't even compile (see reply to [PATCH v4

Also, there is a big WARNING on boot[1], which seems to be triggered by
a new check added for v3.6-rc3[2].  This appears to be introduced by
$SUBJECT series, because I don't see it on vanilla v3.6-rc4.

The good news is that after hacking to fix up the compile problems,
basic PM testing seems to be fine: idle to retention and off as well as
suspend to retention and off work fine on 3430/n900, 3530/Overo,
3730/OveroSTORM, 3730/Beagle-xM.


[    8.745666] WARNING: at /work/kernel/omap/pm/drivers/tty/tty_io.c:1420 tty_init_dev+0x14c/0x17c()
[    8.755218] tty_init_dev: ttyO driver does not set tty->port. This will crash the kernel later. Fix the driver!
[    8.765991] Modules linked in:
[    8.769287] [<c0013d90>] (unwind_backtrace+0x0/0xf0) from [<c0036eec>] (warn_slowpath_common+0x4c/0x64)
[    8.779327] [<c0036eec>] (warn_slowpath_common+0x4c/0x64) from [<c0036f98>] (warn_slowpath_fmt+0x30/0x40)
[    8.789550] [<c0036f98>] (warn_slowpath_fmt+0x30/0x40) from [<c02c626c>] (tty_init_dev+0x14c/0x17c)
[    8.799224] [<c02c626c>] (tty_init_dev+0x14c/0x17c) from [<c02c68a4>] (tty_open+0x11c/0x52c)
[    8.808258] [<c02c68a4>] (tty_open+0x11c/0x52c) from [<c00f86ac>] (chrdev_open+0x90/0x15c)
[    8.817108] [<c00f86ac>] (chrdev_open+0x90/0x15c) from [<c00f2b74>] (do_dentry_open+0x1e8/0x270)
[    8.826507] [<c00f2b74>] (do_dentry_open+0x1e8/0x270) from [<c00f2c30>] (finish_open+0x34/0x4c)
[    8.835784] [<c00f2c30>] (finish_open+0x34/0x4c) from [<c0102028>] (do_last.isra.21+0x5b0/0xbbc)
[    8.845184] [<c0102028>] (do_last.isra.21+0x5b0/0xbbc) from [<c01026dc>] (path_openat+0xa8/0x44c)
[    8.854675] [<c01026dc>] (path_openat+0xa8/0x44c) from [<c0102d34>] (do_filp_open+0x2c/0x80)
[    8.863708] [<c0102d34>] (do_filp_open+0x2c/0x80) from [<c00f3b6c>] (do_sys_open+0xe8/0x184)
[    8.872711] [<c00f3b6c>] (do_sys_open+0xe8/0x184) from [<c000db20>] (ret_fast_syscall+0x0/0x3c)
[    8.882019] ---[ end trace e9bf408c37051346 ]---

commit 5d4121c04b3577e37e389b3553d442f44bb346d7
Author: Jiri Slaby <jslaby at suse.cz>
Date:   Fri Aug 17 14:27:52 2012 +0200

    TTY: check if tty->port is assigned
    And if not, complain loudly. None in-kernel module should trigger
    that, but let us find out for sure. On the other hand, all the
    out-of-tree modules will hit that. Give them some time (maybe one
    release) to catch up.
    Signed-off-by: Jiri Slaby <jslaby at suse.cz>
    Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>

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