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| author |   Jiri Slaby <jslaby@suse.cz> | 2021-07-23 09:43:12 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-27 12:17:20 +0200 |
| commit | 0524513afe45a4a79f418c0377160b7712cab78a (patch) | |
| tree | eab43a3f41c183818029805709a1abbf6625ef21 /arch/m68k | |
| parent | hvsi: don't panic on tty_register_driver failure (diff) | |
| download | linux-dev-0524513afe45a4a79f418c0377160b7712cab78a.tar.xz linux-dev-0524513afe45a4a79f418c0377160b7712cab78a.zip | |
tty: don't store semi-state into tty drivers
When a tty driver pointer is used as a return value of struct
console's device() hook, don't store a semi-state into global variable
which holds the tty driver. It could mean console::device() would return
a bogus value. This is important esp. after the next patch where we
switch from alloc_tty_driver to tty_alloc_driver. tty_alloc_driver
returns ERR_PTR in case of error and that might have unexpected results
as the code doesn't expect this.
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Chris Zankel <chris@zankel.net>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Cc: Felipe Balbi <balbi@kernel.org>
Reviewed-by: Max Filippov <jcmvbkbc@gmail.com>
Acked-by: Helge Deller <deller@gmx.de> # parisc
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210723074317.32690-4-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/m68k')
| -rw-r--r-- | arch/m68k/emu/nfcon.c | 27 |
1 files changed, 15 insertions, 12 deletions
diff --git a/arch/m68k/emu/nfcon.c b/arch/m68k/emu/nfcon.c index 92636c89d65b..f393af375c90 100644 --- a/arch/m68k/emu/nfcon.c +++ b/arch/m68k/emu/nfcon.c @@ -120,35 +120,38 @@ early_param("debug", nf_debug_setup); static int __init nfcon_init(void) { + struct tty_driver *driver; int res; stderr_id = nf_get_id("NF_STDERR"); if (!stderr_id) return -ENODEV; - nfcon_tty_driver = alloc_tty_driver(1); - if (!nfcon_tty_driver) + driver = alloc_tty_driver(1); + if (!driver) return -ENOMEM; tty_port_init(&nfcon_tty_port); - nfcon_tty_driver->driver_name = "nfcon"; - nfcon_tty_driver->name = "nfcon"; - nfcon_tty_driver->type = TTY_DRIVER_TYPE_SYSTEM; - nfcon_tty_driver->subtype = SYSTEM_TYPE_TTY; - nfcon_tty_driver->init_termios = tty_std_termios; - nfcon_tty_driver->flags = TTY_DRIVER_REAL_RAW; + driver->driver_name = "nfcon"; + driver->name = "nfcon"; + driver->type = TTY_DRIVER_TYPE_SYSTEM; + driver->subtype = SYSTEM_TYPE_TTY; + driver->init_termios = tty_std_termios; + driver->flags = TTY_DRIVER_REAL_RAW; - tty_set_operations(nfcon_tty_driver, &nfcon_tty_ops); - tty_port_link_device(&nfcon_tty_port, nfcon_tty_driver, 0); - res = tty_register_driver(nfcon_tty_driver); + tty_set_operations(driver, &nfcon_tty_ops); + tty_port_link_device(&nfcon_tty_port, driver, 0); + res = tty_register_driver(driver); if (res) { pr_err("failed to register nfcon tty driver\n"); - put_tty_driver(nfcon_tty_driver); + put_tty_driver(driver); tty_port_destroy(&nfcon_tty_port); return res; } + nfcon_tty_driver = driver; + if (!(nf_console.flags & CON_ENABLED)) register_console(&nf_console); |