linux-kernel - [PATCH v2 2/5] PCI/switchtec: Fix a MRPC error status handling issue

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Date:   Thu, 14 Oct 2021 14:18:56 +0000
From:   <kelvin.cao@...rochip.com>
To:     <kurt.schwemmer@...rosemi.com>, <logang@...tatee.com>,
        <bhelgaas@...gle.com>, <linux-pci@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <kelvin.cao@...rochip.com>, <kelvincao@...look.com>
Subject: [PATCH v2 2/5] PCI/switchtec: Fix a MRPC error status handling issue

From: Kelvin Cao <kelvin.cao@...rochip.com>

If an error is encountered when executing a MRPC command, the firmware
will set the status register to SWITCHTEC_MRPC_STATUS_ERROR and return
the error code in the return value register.

Add handling of SWITCHTEC_MRPC_STATUS_ERROR on status register when
completing a MRPC command.

Signed-off-by: Kelvin Cao <kelvin.cao@...rochip.com>
---
 drivers/pci/switch/switchtec.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
index e5bb2ac0e7bb..5c300ff3921d 100644
--- a/drivers/pci/switch/switchtec.c
+++ b/drivers/pci/switch/switchtec.c
@@ -238,7 +238,8 @@ static void mrpc_complete_cmd(struct switchtec_dev *stdev)
 	stuser_set_state(stuser, MRPC_DONE);
 	stuser->return_code = 0;
 
-	if (stuser->status != SWITCHTEC_MRPC_STATUS_DONE)
+	if (stuser->status != SWITCHTEC_MRPC_STATUS_DONE &&
+	    stuser->status != SWITCHTEC_MRPC_STATUS_ERROR)
 		goto out;
 
 	if (stdev->dma_mrpc)
@@ -622,7 +623,8 @@ static ssize_t switchtec_dev_read(struct file *filp, char __user *data,
 out:
 	mutex_unlock(&stdev->mrpc_mutex);
 
-	if (stuser->status == SWITCHTEC_MRPC_STATUS_DONE)
+	if (stuser->status == SWITCHTEC_MRPC_STATUS_DONE ||
+	    stuser->status == SWITCHTEC_MRPC_STATUS_ERROR)
 		return size;
 	else if (stuser->status == SWITCHTEC_MRPC_STATUS_INTERRUPTED)
 		return -ENXIO;
-- 
2.25.1