/* * USB Empeg empeg-car player driver * * Copyright (C) 2000, 2001 * Gary Brubaker (xavyer@ix.netcom.com) * * Copyright (C) 1999 - 2001 * Greg Kroah-Hartman (greg@kroah.com) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License, as published by * the Free Software Foundation, version 2. * * See Documentation/usb/usb-serial.txt for more information on using this * driver */ #include #include #include #include #include #include #include #include #include #include #include #define DRIVER_AUTHOR "Greg Kroah-Hartman , Gary Brubaker " #define DRIVER_DESC "USB Empeg Mark I/II Driver" #define EMPEG_VENDOR_ID 0x084f #define EMPEG_PRODUCT_ID 0x0001 /* function prototypes for an empeg-car player */ static int empeg_startup(struct usb_serial *serial); static void empeg_init_termios(struct tty_struct *tty); static const struct usb_device_id id_table[] = { { USB_DEVICE(EMPEG_VENDOR_ID, EMPEG_PRODUCT_ID) }, { } /* Terminating entry */ }; MODULE_DEVICE_TABLE(usb, id_table); static struct usb_serial_driver empeg_device = { .driver = { .owner = THIS_MODULE, .name = "empeg", }, .id_table = id_table, .num_ports = 1, .bulk_out_size = 256, .throttle = usb_serial_generic_throttle, .unthrottle = usb_serial_generic_unthrottle, .attach = empeg_startup, .init_termios = empeg_init_termios, }; static struct usb_serial_driver * const serial_drivers[] = { &empeg_device, NULL }; static int empeg_startup(struct usb_serial *serial) { int r; if (serial->dev->actconfig->desc.bConfigurationValue != 1) { dev_err(&serial->dev->dev, "active config #%d != 1 ??\n", serial->dev->actconfig->desc.bConfigurationValue); return -ENODEV; } r = usb_reset_configuration(serial->dev); /* continue on with initialization */ return r; } static void empeg_init_termios(struct tty_struct *tty) { struct ktermios *termios = &tty->termios; /* * The empeg-car player wants these particular tty settings. * You could, for example, change the baud rate, however the * player only supports 115200 (currently), so there is really * no point in support for changes to the tty settings. * (at least for now) * * The default requirements for this device are: */ termios->c_iflag &= ~(IGNBRK /* disable ignore break */ | BRKINT /* disable break causes interrupt */ | PARMRK /* disable mark parity errors */ | ISTRIP /* disable clear high bit of input characters */ | INLCR /* disable translate NL to CR */ | IGNCR /* disable ignore CR */ | ICRNL /* disable translate CR to NL */ | IXON); /* disable enable XON/XOFF flow control */ termios->c_oflag &= ~OPOST; /* disable postprocess output characters */ termios->c_lflag &= ~(ECHO /* disable echo input characters */ | ECHONL /* disable echo new line */ | ICANON /* disable erase, kill, werase, and rprnt special characters */ | ISIG /* disable interrupt, quit, and suspend special characters */ | IEXTEN); /* disable non-POSIX special characters */ termios->c_cflag &= ~(CSIZE /* no size */ | PARENB /* disable parity bit */ | CBAUD); /* clear current baud rate */ termios->c_cflag |= CS8; /* character size 8 bits */ tty_encode_baud_rate(tty, 115200, 115200); } module_usb_serial_driver(serial_drivers, id_table); MODULE_AUTHOR(DRIVER_AUTHOR); MODULE_DESCRIPTION(DRIVER_DESC); MODULE_LICENSE("GPL"); e>context:space:mode:
authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-02-01 17:45:02 +0000
committerIngo Molnar <mingo@kernel.org>2017-02-01 21:17:49 +0100
commitc8f325a59cfc718d13a50fbc746ed9b415c25e92 (patch)
treed53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /net/sched/sch_cbq.c
parentbf29bddf0417a4783da3b24e8c9e017ac649326f (diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'net/sched/sch_cbq.c')