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authorDan Williams <dan.j.williams@intel.com>2012-04-06 11:49:44 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-04-09 10:34:52 -0700
commit49b532f96fda23663f8be35593d1c1372c0f91e0 (patch)
tree778aacfa431d612f03a136847a0ebe84a9ffe82a /include
parent3579812373aba92b2f3b632bdf99329bc3c05d62 (diff)
Revert "serial/8250_pci: setup-quirk workaround for the kt serial controller"
This reverts commit 448ac154c957c4580531fa0c8f2045816fe2f0e7. The semantic of UPF_IIR_ONCE is only guaranteed to workaround the race condition in the kt serial's iir register if the only source of interrupts is THRE (fifo-empty) events. An modem status event at the wrong time can again cause an iir read to drop the 'empty' status leading to a hang. So, revert this in preparation for using the existing "I don't trust my iir register" workaround in the 8250 core (UART_BUG_THRE). [stable: 3.3.x] Cc: stable <stable@vger.kernel.org> Acked-by: Alan Cox <alan@linux.intel.com> Cc: Sudhakar Mamillapalli <sudhakar@fb.com> Reported-by: Nhan H Mai <nhan.h.mai@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/serial_core.h1
1 files changed, 0 insertions, 1 deletions
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index f51bf2e70c6..882f1d61aa5 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -357,7 +357,6 @@ struct uart_port {
#define UPF_CONS_FLOW ((__force upf_t) (1 << 23))
#define UPF_SHARE_IRQ ((__force upf_t) (1 << 24))
#define UPF_EXAR_EFR ((__force upf_t) (1 << 25))
-#define UPF_IIR_ONCE ((__force upf_t) (1 << 26))
/* The exact UART type is known and should not be probed. */
#define UPF_FIXED_TYPE ((__force upf_t) (1 << 27))
#define UPF_BOOT_AUTOCONF ((__force upf_t) (1 << 28))