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authorDan Williams <dan.j.williams@intel.com>2012-04-06 20:49:50 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-04-09 19:38:30 +0200
commitbc02d15a3452fdf9276e8fb89c5e504a88df888a (patch)
treeb7014c75d121418b0bc88d8c74f699f9a59adc24 /drivers/char/raw.c
parentRevert "serial/8250_pci: setup-quirk workaround for the kt serial controller" (diff)
downloadlinux-bc02d15a3452fdf9276e8fb89c5e504a88df888a.tar.xz
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serial/8250_pci: add a "force background timer" flag and use it for the "kt" serial port
Workaround dropped notifications in the iir register. Register reads coincident with new interrupt notifications sometimes result in this device clearing the interrupt event without reporting it in the read data. The serial core already has a heuristic for determining when a device has an untrustworthy iir register. In this case when we apriori know that the iir is faulty use a flag (UPF_BUG_THRE) to bypass the test and force usage of the background timer. [stable: 3.3.x] Acked-by: Alan Cox <alan@linux.intel.com> Cc: stable <stable@vger.kernel.org> Reported-by: Nhan H Mai <nhan.h.mai@intel.com> Reported-by: Sudhakar Mamillapalli <sudhakar@fb.com> Tested-by: Nhan H Mai <nhan.h.mai@intel.com> Tested-by: Sudhakar Mamillapalli <sudhakar@fb.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/char/raw.c')
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