#include <linux/serial_reg.h>
#include <linux/serial_8250.h>

#include "8250.h"

/*
 * Freescale 16550 UART "driver", Copyright (C) 2011 Paul Gortmaker.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This isn't a full driver; it just provides an alternate IRQ
 * handler to deal with an errata.  Everything else is just
 * using the bog standard 8250 support.
 *
 * We follow code flow of serial8250_default_handle_irq() but add
 * a check for a break and insert a dummy read on the Rx for the
 * immediately following IRQ event.
 *
 * We re-use the already existing "bug handling" lsr_saved_flags
 * field to carry the "what we just did" information from the one
 * IRQ event to the next one.
 */

int fsl8250_handle_irq(struct uart_port *port)
{
	unsigned char lsr, orig_lsr;
	unsigned long flags;
	unsigned int iir;
	struct uart_8250_port *up = up_to_u8250p(port);

	spin_lock_irqsave(&up->port.lock, flags);

	iir = port->serial_in(port, UART_IIR);
	if (iir & UART_IIR_NO_INT) {
		spin_unlock_irqrestore(&up->port.lock, flags);
		return 0;
	}

	/* This is the WAR; if last event was BRK, then read and return */
	if (unlikely(up->lsr_saved_flags & UART_LSR_BI)) {
		up->lsr_saved_flags &= ~UART_LSR_BI;
		port->serial_in(port, UART_RX);
		spin_unlock_irqrestore(&up->port.lock, flags);
		return 1;
	}

	lsr = orig_lsr = up->port.serial_in(&up->port, UART_LSR);

	if (lsr & (UART_LSR_DR | UART_LSR_BI))
		lsr = serial8250_rx_chars(up, lsr);

	serial8250_modem_status(up);

	if (lsr & UART_LSR_THRE)
		serial8250_tx_chars(up);

	up->lsr_saved_flags = orig_lsr;
	spin_unlock_irqrestore(&up->port.lock, flags);
	return 1;
}
EXPORT_SYMBOL_GPL(fsl8250_handle_irq);
<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/serial/kl5kusb105.c?id=a0a28644c1cf191e514dd64bf438e69c178b8440'>tree</a><a class='active' href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/serial/kl5kusb105.c?id=a0a28644c1cf191e514dd64bf438e69c178b8440'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/serial/kl5kusb105.c?id=a0a28644c1cf191e514dd64bf438e69c178b8440'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/drivers/usb/serial/kl5kusb105.c'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=a0a28644c1cf191e514dd64bf438e69c178b8440'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers?id=a0a28644c1cf191e514dd64bf438e69c178b8440'>drivers</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb?id=a0a28644c1cf191e514dd64bf438e69c178b8440'>usb</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/serial?id=a0a28644c1cf191e514dd64bf438e69c178b8440'>serial</a>/<a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/serial/kl5kusb105.c?id=a0a28644c1cf191e514dd64bf438e69c178b8440'>kl5kusb105.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='a0a28644c1cf191e514dd64bf438e69c178b8440'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-02-03 16:18:51 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-02-03 16:18:51 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/serial/kl5kusb105.c?id=a0a28644c1cf191e514dd64bf438e69c178b8440'>a0a28644c1cf191e514dd64bf438e69c178b8440</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/serial/kl5kusb105.c?id=a0a28644c1cf191e514dd64bf438e69c178b8440'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=a0a28644c1cf191e514dd64bf438e69c178b8440'>4a5140d2f13692f91ca012d0eab146e9f366ce95</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/serial/kl5kusb105.c?id=a0a28644c1cf191e514dd64bf438e69c178b8440'>drivers/usb/serial/kl5kusb105.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/serial/kl5kusb105.c?id=a49e6f584e29785f9e5eb8dd31435746818dd5c4'>a49e6f584e29785f9e5eb8dd31435746818dd5c4</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/serial/kl5kusb105.c?id=a0a28644c1cf191e514dd64bf438e69c178b8440&amp;id2=a49e6f584e29785f9e5eb8dd31435746818dd5c4'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/serial/kl5kusb105.c?id=6f3e71c0c3f2479e05682e2e563b75decab36591'>6f3e71c0c3f2479e05682e2e563b75decab36591</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/serial/kl5kusb105.c?id=a0a28644c1cf191e514dd64bf438e69c178b8440&amp;id2=6f3e71c0c3f2479e05682e2e563b75decab36591'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi</div><div class='commit-msg'>Pull SCSI fix from James Bottomley:
 "A single fix this time: a fix for a virtqueue removal bug which only
  appears to affect S390, but which results in the queue hanging forever
  thus causing the machine to fail shutdown"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: virtio_scsi: Reject commands when virtqueue is broken
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=a0a28644c1cf191e514dd64bf438e69c178b8440'>Diffstat</a> (limited to 'drivers/usb/serial/kl5kusb105.c')</div><table summary='diffstat' class='diffstat'>