path: root/86cf786c04541c18febc897686a0d5bea29ce688
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authorSean Young <sean@mess.org>2017-11-08 21:19:45 (GMT)
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2017-11-15 13:57:34 (GMT)
commit30b4e122d71cbec2944a5f8b558b88936ee42f10 (patch)
treed9502baa72354fa85ff8aae9cdd4062d16147b71 /86cf786c04541c18febc897686a0d5bea29ce688
parentf2ecc3d0787e05d9145722feed01d4a11ab6bec1 (diff)
media: rc: sir_ir: detect presence of portHEADmasterfixes
Without this test, sir_ir clumsy claims resources for a device which does not exist. The 0-day kernel test robot reports the following errors (in a loop): sir_ir sir_ir.0: Trapped in interrupt genirq: Flags mismatch irq 4. 00000000 (ttyS0) vs. 00000000 (sir_ir) When sir_ir is loaded with the default io and irq, the following happens: - sir_ir claims irq 4 - user space opens /dev/ttyS0 - in serial8250_do_startup(), some setup is done for ttyS0, which causes irq 4 to fire (in THRE test) - sir_ir does not realise it was not for it, and spins until the "trapped in interrupt" - now serial driver calls setup_irq() and fails and we get the "Flags mismatch" error. There is no port present at 0x3e8 so simply check for the presence of a port, as suggested by Linus. Reported-by: kbuild test robot <fengguang.wu@intel.com> Tested-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Sean Young <sean@mess.org> Cc: <stable@vger.kernel.org> # 4.12+ Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to '86cf786c04541c18febc897686a0d5bea29ce688')
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