From: b32955@freescale•com (Huang Shijie)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 1/5] serial: imx: remove unneeded imx_transmit_buffer() from imx_start_tx()
Date: Mon, 12 May 2014 16:17:16 +0800 [thread overview]
Message-ID: <5370838C.4060300@freescale.com> (raw)
In-Reply-To: <53708049.8060108@mentor.com>
? 2014?05?12? 16:03, Dean Jenkins ??:
> Well, the locking might now be OK but due to an existing issue the TX
> will be woken up excessively with no new characters to transmit so
> there will be excessive context switching with the new work queue that
> results in no useful work done. There is an API issue in HCI LDISC
> because TTY_DO_WRITE_WAKEUP is set BEFORE checking whether any
> characters remain pending to be sent. This means most of the time
> hci_uart_tx_wakeup() is unnecessarily called will no chance of seeing
> any remain pending characters to be process. This weakness contributed
> to triggering lockup issue.
>
You can send a patch to fix the Bluetooth code. :)
I am happy if you can improve the Bluetooth.
thanks
Huang Shijie
next prev parent reply other threads:[~2014-05-12 8:17 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-05-09 15:19 [PATCH 0/5] serial: imx: fixes dean_jenkins at mentor.com
2014-05-09 15:19 ` [PATCH 1/5] serial: imx: remove unneeded imx_transmit_buffer() from imx_start_tx() dean_jenkins at mentor.com
2014-05-12 3:40 ` Huang Shijie
2014-05-12 5:45 ` Dirk Behme
2014-05-12 6:30 ` Huang Shijie
2014-05-12 6:40 ` Dirk Behme
2014-05-12 6:53 ` Huang Shijie
2014-05-12 8:03 ` Dean Jenkins
2014-05-12 8:17 ` Huang Shijie [this message]
2014-05-09 15:19 ` [PATCH 2/5] serial: imx: remove uart_write_wakeup() from imx_transmit_buffer() dean_jenkins at mentor.com
2014-05-09 15:19 ` [PATCH 3/5] serial: imx: avoid spinlock recursion deadlock dean_jenkins at mentor.com
2014-05-12 3:12 ` Huang Shijie
2014-05-14 16:24 ` Dean Jenkins
2014-05-09 15:19 ` [PATCH 4/5] serial: imx: move imx_transmit_buffer() into imx_txint() dean_jenkins at mentor.com
2014-05-09 15:19 ` [PATCH 5/5] serial: imx: clean up imx_poll_get_char() dean_jenkins at mentor.com
2014-05-28 19:34 ` [PATCH 0/5] serial: imx: fixes Greg KH
2014-05-29 4:58 ` Dirk Behme
2014-05-29 4:14 ` Huang Shijie
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