linux-kernel - [Bugfix 3/3] eata: Enhance eata driver to support PCI device hot-removal

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Date:	Mon, 14 Sep 2015 11:08:59 +0800
From:	Jiang Liu <jiang.liu@...ux.intel.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Arthur Marsh <arthur.marsh@...ernode.on.net>,
	Dario Ballabio <ballabio_dario@....com>,
	"James E.J. Bottomley" <JBottomley@...n.com>
Cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	linux-scsi@...r.kernel.org, x86@...nel.org
Subject: [Bugfix 3/3] eata: Enhance eata driver to support PCI device hot-removal

Due to having no hardware for testing, this is just a sample code
to support PCI device hot-removal. It just passing compilation,
no any tests.

Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
 drivers/scsi/eata.c |   26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/scsi/eata.c b/drivers/scsi/eata.c
index b92e6856f909..f3bd7cbf260e 100644
--- a/drivers/scsi/eata.c
+++ b/drivers/scsi/eata.c
@@ -1474,6 +1474,21 @@ static unsigned int port_probe(unsigned long port_base,
 #ifdef CONFIG_PCI
 static int eata2x_pci_device_count;
 
+/* TODO: need help here to shutdown the scsi host and release resources */
+static void port_remove(unsigned int id, resource_size_t port_base,
+			struct pci_dev *pdev)
+{
+	struct Scsi_Host *shost = sh[id];
+
+	/* TODO: stop scsi device */
+	scsi_unregister(shost);
+	/* TODO: clean up resources allocated by port_detect() */
+	clear_bit(id, eata_board_bitmap);
+	free_irq(shost->irq, &sha[id]);
+	release_region(port_base, REGION_SIZE);
+	ida_simple_remove(&eata_ida, id);
+}
+
 static int eata2x_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 {
 	int i, ret = -ENXIO;
@@ -1521,6 +1536,16 @@ out_error:
 	return ret;
 }
 
+static void eata2x_pci_remove(struct pci_dev *pdev)
+{
+	int id = (int)(long)dev_get_drvdata(&pdev->dev);
+	resource_size_t port_base;
+
+	port_base = pci_resource_start(pdev, 0) + PCI_BASE_ADDRESS_0;
+	port_remove(id, port_base, pdev);
+	pci_disable_device(pdev);
+}
+
 static struct pci_device_id eata2x_tbl[] = {
 	{ PCI_DEVICE_CLASS(PCI_CLASS_STORAGE_SCSI << 8, PCI_ANY_ID) },
 	{ },
@@ -1531,6 +1556,7 @@ static struct pci_driver eata2x_pci_driver = {
 	.name		= "eata",
 	.id_table	= eata2x_tbl,
 	.probe		= eata2x_pci_probe,
+	.remove		= eata2x_pci_remove,
 };
 
 static int eata2x_probe_pci_devices(struct scsi_host_template *tpnt)
-- 
1.7.10.4

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