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| author | Thomas Gleixner <tglx@linutronix.de> | 2020-10-19 12:06:30 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-21 13:28:20 +0100 |
| commit | e2d85988b423f6d81584aa4f536402895a4933bb (patch) | |
| tree | 9cd24c3b0363b24eaf1139c9d9ff8da6206b51cc | |
| parent | 4848b8000a284b1abc908b818f052987a21a498a (diff) | |
| download | linux-stable-e2d85988b423f6d81584aa4f536402895a4933bb.tar.gz linux-stable-e2d85988b423f6d81584aa4f536402895a4933bb.tar.bz2 linux-stable-e2d85988b423f6d81584aa4f536402895a4933bb.zip | |
USB: sisusbvga: Make console support depend on BROKEN
commit 862ee699fefe1e6d6f2c1518395f0b999b8beb15 upstream.
The console part of sisusbvga is broken vs. printk(). It uses in_atomic()
to detect contexts in which it cannot sleep despite the big fat comment in
preempt.h which says: Do not use in_atomic() in driver code.
in_atomic() does not work on kernels with CONFIG_PREEMPT_COUNT=n which
means that spin/rw_lock held regions are not detected by it.
There is no way to make this work by handing context information through to
the driver and this only can be solved once the core printk infrastructure
supports sleepable console drivers.
Make it depend on BROKEN for now.
Fixes: 1bbb4f2035d9 ("[PATCH] USB: sisusb[vga] update")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Thomas Winischhofer <thomas@winischhofer.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20201019101109.603244207@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/misc/sisusbvga/Kconfig | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/misc/sisusbvga/Kconfig b/drivers/usb/misc/sisusbvga/Kconfig index 655d9cb0651a..c12cdd015410 100644 --- a/drivers/usb/misc/sisusbvga/Kconfig +++ b/drivers/usb/misc/sisusbvga/Kconfig @@ -16,7 +16,7 @@ config USB_SISUSBVGA config USB_SISUSBVGA_CON bool "Text console and mode switching support" if USB_SISUSBVGA - depends on VT + depends on VT && BROKEN select FONT_8x16 help Say Y here if you want a VGA text console via the USB dongle or |