linux-kernel - [PATCH] jsm: Fixed EEH recovery error

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Message-Id: <1326113886-10830-1-git-send-email-lucaskt@linux.vnet.ibm.com>
Date:	Mon,  9 Jan 2012 10:58:06 -0200
From:	Lucas Kannebley Tavares <lucaskt@...ux.vnet.ibm.com>
To:	Greg KH <greg@...ah.com>
Cc:	Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>,
	Breno Leitao <leitao@...ux.vnet.ibm.com>,
	Alan Cox <alan@...ux.intel.com>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, Breno Leitao <brenohl@...ibm.com>
Subject: [PATCH] jsm: Fixed EEH recovery error

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> 
---
 drivers/tty/serial/jsm/jsm_driver.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/tty/serial/jsm/jsm_driver.c b/drivers/tty/serial/jsm/jsm_driver.c
index 7c867a0..7545fe1 100644
--- 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 *pdev)
 	struct jsm_board *brd = pci_get_drvdata(pdev);

 	pci_restore_state(pdev);
+	pci_save_state(pdev);

 	jsm_uart_port_init(brd);
 }
-- 
1.7.4.4

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