From: Sebastian Andrzej Siewior <bigeasy@linutronix.de> To: Russell King - ARM Linux <linux@arm.linux.org.uk> Cc: Peter Hurley <peter@hurleysoftware.com>, Nicolas Schichan <nschichan@freebox.fr>, Tony Lindgren <tony@atomide.com>, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, balbi@ti.com, linux-serial@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH] serial: 8250: Revert "tty: serial: 8250_core: read only RX if there is something in the FIFO" Date: Sun, 15 Feb 2015 18:32:16 +0100 [thread overview] Message-ID: <20150215173216.GA8660@linutronix.de> (raw) In-Reply-To: <20150213231519.GF8670@n2100.arm.linux.org.uk> This reverts commit 0aa525d11859c1a4d5b78fdc704148e2ae03ae13. The conditional RX-FIFO read seems to cause spurious interrupts and we see just: |serial8250: too much work for irq29 The previous behaviour was "default" for decades and Marvell's 88f6282 SoC might not be the only that relies on it. Therefore the Omap fix is reverted for now. Fixes: 0aa525d11859 ("tty: serial: 8250_core: read only RX if there is something in the FIFO") Reported-By: Nicolas Schichan <nschichan@freebox.fr> Debuged-By: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> --- * Russell King - ARM Linux | 2015-02-13 23:15:19 [+0000]: >On Fri, Feb 13, 2015 at 07:51:16PM +0100, Sebastian Andrzej Siewior wrote: >> Something like this maybe? > >My personal feeling is that as 0aa525d11859 was wrong, it should be >reverted and this should be another attempt to fix the problem. In >other words, there should be two patches, one a revert of the previously >known bad commit and this one having another go at it. > >I feel that would be a better approach, since then we don't end up >with this change building on a previously know buggy change. It >would also make the changes to this solution from the previous, >known-to-work-for-decades code more obvious. Okay. So here is the revert. drivers/tty/serial/8250/8250_core.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index e3b9570a1eff..deae122c9c4b 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -2138,8 +2138,8 @@ int serial8250_do_startup(struct uart_port *port) /* * Clear the interrupt registers. */ - if (serial_port_in(port, UART_LSR) & UART_LSR_DR) - serial_port_in(port, UART_RX); + serial_port_in(port, UART_LSR); + serial_port_in(port, UART_RX); serial_port_in(port, UART_IIR); serial_port_in(port, UART_MSR); @@ -2300,8 +2300,8 @@ int serial8250_do_startup(struct uart_port *port) * saved flags to avoid getting false values from polling * routines or the previous session. */ - if (serial_port_in(port, UART_LSR) & UART_LSR_DR) - serial_port_in(port, UART_RX); + serial_port_in(port, UART_LSR); + serial_port_in(port, UART_RX); serial_port_in(port, UART_IIR); serial_port_in(port, UART_MSR); up->lsr_saved_flags = 0; @@ -2394,8 +2394,7 @@ void serial8250_do_shutdown(struct uart_port *port) * Read data port to reset things, and then unlink from * the IRQ chain. */ - if (serial_port_in(port, UART_LSR) & UART_LSR_DR) - serial_port_in(port, UART_RX); + serial_port_in(port, UART_RX); serial8250_rpm_put(up); del_timer_sync(&up->timer); -- 2.1.4
WARNING: multiple messages have this Message-ID (diff)
From: bigeasy@linutronix.de (Sebastian Andrzej Siewior) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH] serial: 8250: Revert "tty: serial: 8250_core: read only RX if there is something in the FIFO" Date: Sun, 15 Feb 2015 18:32:16 +0100 [thread overview] Message-ID: <20150215173216.GA8660@linutronix.de> (raw) In-Reply-To: <20150213231519.GF8670@n2100.arm.linux.org.uk> This reverts commit 0aa525d11859c1a4d5b78fdc704148e2ae03ae13. The conditional RX-FIFO read seems to cause spurious interrupts and we see just: |serial8250: too much work for irq29 The previous behaviour was "default" for decades and Marvell's 88f6282 SoC might not be the only that relies on it. Therefore the Omap fix is reverted for now. Fixes: 0aa525d11859 ("tty: serial: 8250_core: read only RX if there is something in the FIFO") Reported-By: Nicolas Schichan <nschichan@freebox.fr> Debuged-By: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> --- * Russell King - ARM Linux | 2015-02-13 23:15:19 [+0000]: >On Fri, Feb 13, 2015 at 07:51:16PM +0100, Sebastian Andrzej Siewior wrote: >> Something like this maybe? > >My personal feeling is that as 0aa525d11859 was wrong, it should be >reverted and this should be another attempt to fix the problem. In >other words, there should be two patches, one a revert of the previously >known bad commit and this one having another go at it. > >I feel that would be a better approach, since then we don't end up >with this change building on a previously know buggy change. It >would also make the changes to this solution from the previous, >known-to-work-for-decades code more obvious. Okay. So here is the revert. drivers/tty/serial/8250/8250_core.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index e3b9570a1eff..deae122c9c4b 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -2138,8 +2138,8 @@ int serial8250_do_startup(struct uart_port *port) /* * Clear the interrupt registers. */ - if (serial_port_in(port, UART_LSR) & UART_LSR_DR) - serial_port_in(port, UART_RX); + serial_port_in(port, UART_LSR); + serial_port_in(port, UART_RX); serial_port_in(port, UART_IIR); serial_port_in(port, UART_MSR); @@ -2300,8 +2300,8 @@ int serial8250_do_startup(struct uart_port *port) * saved flags to avoid getting false values from polling * routines or the previous session. */ - if (serial_port_in(port, UART_LSR) & UART_LSR_DR) - serial_port_in(port, UART_RX); + serial_port_in(port, UART_LSR); + serial_port_in(port, UART_RX); serial_port_in(port, UART_IIR); serial_port_in(port, UART_MSR); up->lsr_saved_flags = 0; @@ -2394,8 +2394,7 @@ void serial8250_do_shutdown(struct uart_port *port) * Read data port to reset things, and then unlink from * the IRQ chain. */ - if (serial_port_in(port, UART_LSR) & UART_LSR_DR) - serial_port_in(port, UART_RX); + serial_port_in(port, UART_RX); serial8250_rpm_put(up); del_timer_sync(&up->timer); -- 2.1.4
next prev parent reply other threads:[~2015-02-15 17:32 UTC|newest] Thread overview: 236+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-09-10 19:29 [PATCH 00/16 v9] omap 8250 based uart + DMA Sebastian Andrzej Siewior 2014-09-10 19:29 ` Sebastian Andrzej Siewior 2014-09-10 19:29 ` Sebastian Andrzej Siewior 2014-09-10 19:29 ` [PATCH 01/16] tty: serial: 8250_core: allow to set ->throttle / ->unthrottle callbacks Sebastian Andrzej Siewior 2014-09-10 19:29 ` Sebastian Andrzej Siewior 2014-09-10 19:29 ` [PATCH 02/16] tty: serial: 8250_core: add run time pm Sebastian Andrzej Siewior 2014-09-10 19:29 ` Sebastian Andrzej Siewior 2014-09-10 19:29 ` Sebastian Andrzej Siewior 2014-09-29 9:46 ` Frans Klaver 2014-09-29 9:46 ` Frans Klaver 2014-09-29 9:46 ` Frans Klaver 2014-09-29 13:39 ` Sebastian Andrzej Siewior 2014-09-29 13:39 ` Sebastian Andrzej Siewior 2014-09-10 19:29 ` [PATCH 03/16] tty: serial: 8250_core: read only RX if there is something in the FIFO Sebastian Andrzej Siewior 2014-09-10 19:29 ` Sebastian Andrzej Siewior 2015-02-09 13:34 ` Nicolas Schichan 2015-02-09 13:34 ` Nicolas Schichan 2015-02-09 23:34 ` Peter Hurley 2015-02-09 23:34 ` Peter Hurley 2015-02-10 9:32 ` Sebastian Andrzej Siewior 2015-02-10 9:32 ` Sebastian Andrzej Siewior 2015-02-10 12:04 ` Nicolas Schichan 2015-02-10 12:04 ` Nicolas Schichan 2015-02-10 17:46 ` Peter Hurley 2015-02-10 17:46 ` Peter Hurley 2015-02-11 20:01 ` Peter Hurley 2015-02-11 20:01 ` Peter Hurley 2015-02-11 20:03 ` Tony Lindgren 2015-02-11 20:03 ` Tony Lindgren 2015-02-11 20:03 ` Tony Lindgren 2015-02-11 20:42 ` Peter Hurley 2015-02-11 20:42 ` Peter Hurley 2015-02-12 8:45 ` Sebastian Andrzej Siewior 2015-02-12 8:45 ` Sebastian Andrzej Siewior 2015-02-12 9:40 ` Russell King - ARM Linux 2015-02-12 9:40 ` Russell King - ARM Linux 2015-02-12 16:32 ` Peter Hurley 2015-02-12 16:32 ` Peter Hurley 2015-02-12 19:23 ` Sebastian Andrzej Siewior 2015-02-12 19:23 ` Sebastian Andrzej Siewior 2015-02-12 19:55 ` Peter Hurley 2015-02-12 19:55 ` Peter Hurley 2015-02-12 20:34 ` Sebastian Andrzej Siewior 2015-02-12 20:34 ` Sebastian Andrzej Siewior 2015-02-13 18:51 ` Sebastian Andrzej Siewior 2015-02-13 18:51 ` Sebastian Andrzej Siewior 2015-02-13 23:15 ` Russell King - ARM Linux 2015-02-13 23:15 ` Russell King - ARM Linux 2015-02-15 17:32 ` Sebastian Andrzej Siewior [this message] 2015-02-15 17:32 ` [PATCH] serial: 8250: Revert "tty: serial: 8250_core: read only RX if there is something in the FIFO" Sebastian Andrzej Siewior 2015-05-12 20:25 ` Tony Lindgren 2015-05-12 20:25 ` Tony Lindgren 2014-09-10 19:29 ` [PATCH 04/16] tty: serial: 8250_core: use the ->line argument as a hint in serial8250_find_match_or_unused() Sebastian Andrzej Siewior 2014-09-10 19:29 ` Sebastian Andrzej Siewior 2014-09-10 19:30 ` [PATCH 05/16] tty: serial: 8250_core: remove UART_IER_RDI in serial8250_stop_rx() Sebastian Andrzej Siewior 2014-09-10 19:30 ` Sebastian Andrzej Siewior 2014-09-11 11:19 ` Heikki Krogerus 2014-09-11 11:19 ` Heikki Krogerus 2014-09-10 19:30 ` [PATCH 06/16] tty: serial: Add 8250-core based omap driver Sebastian Andrzej Siewior 2014-09-10 19:30 ` Sebastian Andrzej Siewior 2014-09-11 11:57 ` Peter Hurley 2014-09-11 11:57 ` Peter Hurley 2014-09-11 11:57 ` Peter Hurley 2014-09-16 17:01 ` Sebastian Andrzej Siewior 2014-09-16 17:01 ` Sebastian Andrzej Siewior 2014-09-16 17:01 ` Sebastian Andrzej Siewior 2014-09-29 9:38 ` Frans Klaver 2014-09-29 9:38 ` Frans Klaver 2014-09-29 9:38 ` Frans Klaver 2014-09-29 13:27 ` Sebastian Andrzej Siewior 2014-09-29 13:27 ` Sebastian Andrzej Siewior 2014-09-29 13:34 ` Frans Klaver 2014-09-29 13:34 ` Frans Klaver 2014-09-10 19:30 ` [PATCH 07/16] tty: serial: 8250_dma: handle error on TX submit Sebastian Andrzej Siewior 2014-09-10 19:30 ` Sebastian Andrzej Siewior 2014-09-10 19:30 ` [PATCH 08/16] tty: serial: 8250_dma: enqueue RX dma again on completion Sebastian Andrzej Siewior 2014-09-10 19:30 ` Sebastian Andrzej Siewior 2014-09-10 19:30 ` Sebastian Andrzej Siewior 2014-09-10 19:30 ` [PATCH 09/16] tty: serial: 8250_dma: Add a TX trigger workaround for AM33xx Sebastian Andrzej Siewior 2014-09-10 19:30 ` Sebastian Andrzej Siewior 2014-09-10 19:30 ` Sebastian Andrzej Siewior 2014-09-11 11:17 ` Heikki Krogerus 2014-09-11 11:17 ` Heikki Krogerus 2014-09-11 11:17 ` Heikki Krogerus 2014-09-11 11:42 ` Sebastian Andrzej Siewior 2014-09-11 11:42 ` Sebastian Andrzej Siewior 2014-09-11 11:42 ` Sebastian Andrzej Siewior 2014-09-11 12:32 ` Peter Hurley 2014-09-11 12:32 ` Peter Hurley 2014-09-11 12:50 ` Sebastian Andrzej Siewior 2014-09-11 12:50 ` Sebastian Andrzej Siewior 2014-09-11 14:35 ` Peter Hurley 2014-09-11 14:35 ` Peter Hurley 2014-09-11 14:35 ` Peter Hurley 2014-09-15 17:01 ` Sebastian Andrzej Siewior 2014-09-15 17:01 ` Sebastian Andrzej Siewior 2014-09-16 16:55 ` Sebastian Andrzej Siewior 2014-09-16 16:55 ` Sebastian Andrzej Siewior 2014-09-16 16:55 ` Sebastian Andrzej Siewior 2014-09-17 12:20 ` Peter Hurley 2014-09-17 12:20 ` Peter Hurley 2014-09-17 16:25 ` Sebastian Andrzej Siewior 2014-09-17 16:25 ` Sebastian Andrzej Siewior 2014-09-17 16:25 ` Sebastian Andrzej Siewior 2014-09-29 16:15 ` Sebastian Andrzej Siewior 2014-09-29 16:15 ` Sebastian Andrzej Siewior 2014-09-11 15:11 ` Frans Klaver 2014-09-11 15:11 ` Frans Klaver 2014-09-11 15:11 ` Frans Klaver 2014-09-11 16:04 ` Sebastian Andrzej Siewior 2014-09-11 16:04 ` Sebastian Andrzej Siewior 2014-09-11 17:04 ` Frans Klaver 2014-09-11 17:04 ` Frans Klaver 2014-09-12 7:23 ` Sebastian Andrzej Siewior 2014-09-12 7:23 ` Sebastian Andrzej Siewior 2014-09-12 9:40 ` Frans Klaver 2014-09-12 9:40 ` Frans Klaver 2014-09-12 9:51 ` Sebastian Andrzej Siewior 2014-09-12 9:51 ` Sebastian Andrzej Siewior 2014-09-12 10:28 ` Frans Klaver 2014-09-12 10:28 ` Frans Klaver 2014-09-12 10:28 ` Frans Klaver 2014-09-15 16:42 ` Sebastian Andrzej Siewior 2014-09-15 16:42 ` Sebastian Andrzej Siewior 2014-09-16 9:05 ` Frans Klaver 2014-09-16 9:05 ` Frans Klaver 2014-09-16 9:05 ` Frans Klaver 2014-09-16 12:42 ` Frans Klaver 2014-09-16 12:42 ` Frans Klaver 2014-09-16 12:42 ` Frans Klaver 2014-09-16 14:23 ` Frans Klaver 2014-09-16 14:23 ` Frans Klaver 2014-09-16 14:23 ` Frans Klaver 2014-09-17 10:28 ` Frans Klaver 2014-09-17 10:28 ` Frans Klaver 2014-09-17 10:28 ` Frans Klaver 2014-09-21 20:41 ` Sebastian Andrzej Siewior 2014-09-21 20:41 ` Sebastian Andrzej Siewior 2014-09-21 20:41 ` Sebastian Andrzej Siewior 2014-09-22 9:28 ` Frans Klaver 2014-09-22 9:28 ` Frans Klaver 2014-09-22 9:28 ` Frans Klaver 2014-09-24 7:56 ` Sebastian Andrzej Siewior 2014-09-24 7:56 ` Sebastian Andrzej Siewior 2014-09-25 15:14 ` Sebastian Andrzej Siewior 2014-09-25 15:14 ` Sebastian Andrzej Siewior 2014-09-25 15:18 ` Frans Klaver 2014-09-25 15:18 ` Frans Klaver 2014-09-29 8:50 ` Frans Klaver 2014-09-29 8:50 ` Frans Klaver 2014-09-29 8:50 ` Frans Klaver 2014-09-29 9:54 ` Sebastian Andrzej Siewior 2014-09-29 9:54 ` Sebastian Andrzej Siewior 2014-09-29 10:30 ` Frans Klaver 2014-09-29 10:30 ` Frans Klaver 2014-09-29 10:30 ` Frans Klaver 2014-09-30 8:44 ` Frans Klaver 2014-09-30 8:44 ` Frans Klaver 2014-09-30 8:44 ` Frans Klaver 2014-10-02 10:27 ` Sebastian Andrzej Siewior 2014-10-02 10:27 ` Sebastian Andrzej Siewior 2014-10-02 10:27 ` Sebastian Andrzej Siewior 2014-10-13 14:55 ` Frans Klaver 2014-10-13 14:55 ` Frans Klaver 2014-10-13 14:55 ` Frans Klaver 2014-09-23 17:03 ` Peter Hurley 2014-09-23 17:03 ` Peter Hurley 2014-09-24 7:53 ` Sebastian Andrzej Siewior 2014-09-24 7:53 ` Sebastian Andrzej Siewior 2014-09-25 10:42 ` Sebastian Andrzej Siewior 2014-09-25 10:42 ` Sebastian Andrzej Siewior 2014-09-25 11:31 ` Peter Hurley 2014-09-25 11:31 ` Peter Hurley 2014-09-25 13:11 ` Sebastian Andrzej Siewior 2014-09-25 13:11 ` Sebastian Andrzej Siewior 2014-09-25 13:11 ` Sebastian Andrzej Siewior 2014-09-17 16:34 ` Sebastian Andrzej Siewior 2014-09-17 16:34 ` Sebastian Andrzej Siewior 2014-09-17 16:34 ` Sebastian Andrzej Siewior 2014-09-19 10:22 ` Heikki Krogerus 2014-09-19 10:22 ` Heikki Krogerus 2014-09-19 10:22 ` Heikki Krogerus 2014-09-19 10:58 ` Sebastian Andrzej Siewior 2014-09-19 10:58 ` Sebastian Andrzej Siewior 2014-09-19 11:25 ` Peter Hurley 2014-09-19 11:25 ` Peter Hurley 2014-09-22 7:46 ` Heikki Krogerus 2014-09-22 7:46 ` Heikki Krogerus 2014-09-25 9:24 ` Sebastian Andrzej Siewior 2014-09-25 9:24 ` Sebastian Andrzej Siewior 2014-09-10 19:30 ` [PATCH 10/16] tty: serial: 8250_dma: optimize the xmit path due to UART_BUG_DMA_TX Sebastian Andrzej Siewior 2014-09-10 19:30 ` Sebastian Andrzej Siewior 2014-09-10 19:30 ` Sebastian Andrzej Siewior 2014-09-10 19:30 ` [PATCH 11/16] tty: serial: 8250_dma: keep own book keeping about RX transfers Sebastian Andrzej Siewior 2014-09-10 19:30 ` Sebastian Andrzej Siewior 2014-09-10 19:30 ` Sebastian Andrzej Siewior 2014-09-10 19:30 ` [PATCH 12/16] tty: serial: 8250_dma: handle the UART RDI event while DMA remains idle Sebastian Andrzej Siewior 2014-09-10 19:30 ` Sebastian Andrzej Siewior 2014-09-29 9:23 ` Frans Klaver 2014-09-29 9:23 ` Frans Klaver 2014-09-29 9:23 ` Frans Klaver 2014-09-10 19:30 ` [PATCH 13/16] tty: serial: 8250_dma: add pm runtime Sebastian Andrzej Siewior 2014-09-10 19:30 ` Sebastian Andrzej Siewior 2014-09-29 9:26 ` Frans Klaver 2014-09-29 9:26 ` Frans Klaver 2014-09-29 9:26 ` Frans Klaver 2014-09-29 9:56 ` Sebastian Andrzej Siewior 2014-09-29 9:56 ` Sebastian Andrzej Siewior 2014-09-10 19:30 ` [PATCH 14/16] arm: dts: am33xx: add DMA properties for UART Sebastian Andrzej Siewior 2014-09-10 19:30 ` Sebastian Andrzej Siewior 2014-09-10 19:30 ` Sebastian Andrzej Siewior 2014-09-10 19:30 ` [PATCH 15/16] arm: dts: dra7: " Sebastian Andrzej Siewior 2014-09-10 19:30 ` Sebastian Andrzej Siewior 2014-09-10 19:30 ` [PATCH 16/16] tty: serial: 8250: omap: add dma support Sebastian Andrzej Siewior 2014-09-10 19:30 ` Sebastian Andrzej Siewior 2014-09-12 22:43 ` [PATCH 00/16 v9] omap 8250 based uart + DMA Tony Lindgren 2014-09-12 22:43 ` Tony Lindgren 2014-09-12 22:43 ` Tony Lindgren 2014-09-15 11:50 ` Sebastian Andrzej Siewior 2014-09-15 11:50 ` Sebastian Andrzej Siewior 2014-09-15 11:50 ` Sebastian Andrzej Siewior 2014-09-16 12:57 ` Sebastian Andrzej Siewior 2014-09-16 12:57 ` Sebastian Andrzej Siewior 2014-09-16 12:57 ` Sebastian Andrzej Siewior 2014-09-16 16:48 ` Tony Lindgren 2014-09-16 16:48 ` Tony Lindgren 2014-09-16 21:30 ` Tony Lindgren 2014-09-16 21:30 ` Tony Lindgren 2014-09-16 21:30 ` Tony Lindgren 2014-09-17 8:38 ` Sebastian Andrzej Siewior 2014-09-17 8:38 ` Sebastian Andrzej Siewior 2014-09-17 9:05 ` Sebastian Andrzej Siewior 2014-09-17 9:05 ` Sebastian Andrzej Siewior 2014-09-26 16:02 ` Greg KH 2014-09-26 16:02 ` Greg KH 2014-09-26 16:02 ` Greg KH
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