linux-kernel - [52/89] jsm: Fixed EEH recovery error

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Message-Id: <20120201210048.469113293@clark.kroah.org>
Date:	Wed, 01 Feb 2012 13:00:16 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Lucas Kannebley Tavares <lucaskt@...ux.vnet.ibm.com>,
	Breno Leitao <brenohl@...ibm.com>,
	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
Subject: [52/89] jsm: Fixed EEH recovery error

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Lucas Kannebley Tavares <lucaskt@...ux.vnet.ibm.com>

commit 26aa38cafae0dbef3b2fe75ea487c83313c36d45 upstream.

There was an error on the jsm driver that would cause it to be unable to
recover after a second error is detected.

At the first error, the device recovers properly:

[72521.485691] EEH: Detected PCI bus error on device 0003:02:00.0
[72521.485695] EEH: This PCI device has failed 1 times in the last hour:
...
[72532.035693] ttyn3 at MMIO 0x0 (irq = 49) is a jsm
[72532.105689] jsm: Port 3 added

However, at the second error, it cascades until EEH disables the device:

[72631.229549] Call Trace:
...
[72641.725687] jsm: Port 3 added
[72641.725695] EEH: Detected PCI bus error on device 0003:02:00.0
[72641.725698] EEH: This PCI device has failed 3 times in the last hour:

It was caused because the PCI state was not being saved after the first
restore. Therefore, at the second recovery the PCI state would not be
restored.

Signed-off-by: Lucas Kannebley Tavares <lucaskt@...ux.vnet.ibm.com>
Signed-off-by: Breno Leitao <brenohl@...ibm.com>
Acked-by: Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/tty/serial/jsm/jsm_driver.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/tty/serial/jsm/jsm_driver.c
+++ b/drivers/tty/serial/jsm/jsm_driver.c
@@ -251,6 +251,7 @@ static void jsm_io_resume(struct pci_dev
 	struct jsm_board *brd = pci_get_drvdata(pdev);

 	pci_restore_state(pdev);
+	pci_save_state(pdev);

 	jsm_uart_port_init(brd);
 }

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