linux-kernel - Re: [RFC: 2.6 patch] remove the broken i82443bxgx

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Date:	Mon, 01 Sep 2008 00:30:10 +0300
From:	Vladislav Bogdanov <slava_reg@...s.by>
To:	Adrian Bunk <bunk@...nel.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Douglas Thompson <dougthompson@...ssion.com>,
	Tim Small <tim@...tersideup.com>, Greg KH <greg@...ah.com>,
	bluesmoke-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [RFC: 2.6 patch] remove the broken i82443bxgx_edac driver

Adrian Bunk wrote:
 > The i82443bxgx_edac driver was added more than one year ago, but after
 > only 3 seconds in Linus' tree it got a dependency on BROKEN with Andrew
 > stating:
 >
 >     It will claim the PCI devices from under intel_agp.ko's feet.
 >     Greg is brewing some fix for that.
 >
 > Since noone seems to care enough about this driver to get it working we
 > can as well remove it.
 >

Why not just make the same hack as in i3000_edac.c, i82860_edac.c, 
i82875p_edac.c and i82975x_edac.c?
I mean code around all occuriencies of 'mci_pdev'.
This hack still needs some polishing (at least for i82875p and i82975x), but it 
works for me (I have AGP stuff compiled into kernel).
I attach 10-minutes copy-paste patch (completely untested, sorry, idea only).
I have 443gx just upgraded to 2.6 so I'll try to test it in next few days.

Best,
Vladislav

Signed-off-by: Vladislav Bogdanov <slava@...s.by>
---

--- a/drivers/edac/i82443bxgx_edac.c    2008-02-18 15:04:39.000000000 +0200
+++ a/drivers/edac/i82443bxgx_edac.c    2008-09-01 00:14:45.000000000 +0300
@@ -114,6 +114,12 @@ struct i82443bxgx_edacmc_error_info {

  static struct edac_pci_ctl_info *i82443bxgx_pci;

+static struct pci_dev *mci_pdev;       /* init dev: in case that AGP code has
+                                        * already registered driver
+                                        */
+
+static int 82443bxgx_registered = 1;
+
  static void i82443bxgx_edacmc_get_error_info(struct mem_ctl_info *mci,
                                 struct i82443bxgx_edacmc_error_info
                                 *info)
@@ -345,10 +351,17 @@ EXPORT_SYMBOL_GPL(i82443bxgx_edacmc_prob
  static int __devinit i82443bxgx_edacmc_init_one(struct pci_dev *pdev,
                                                 const struct pci_device_id *ent)
  {
+       int rc;
+
         debugf0("MC: " __FILE__ ": %s()\n", __func__);

         /* don't need to call pci_device_enable() */
-       return i82443bxgx_edacmc_probe1(pdev, ent->driver_data);
+       rc = i82443bxgx_edacmc_probe1(pdev, ent->driver_data);
+
+       if (!mci_pdev)
+               mci_pdev = pci_dev_get(pdev);
+
+       return rc;
  }

  static void __devexit i82443bxgx_edacmc_remove_one(struct pci_dev *pdev)
@@ -390,12 +403,57 @@ static int __init i82443bxgx_edacmc_init
         /* Ensure that the OPSTATE is set correctly for POLL or NMI */
         opstate_init();

-       return pci_register_driver(&i82443bxgx_edacmc_driver);
+       pci_rc = pci_register_driver(&i82443bxgx_edacmc_driver);
+       if (pci_rc < 0)
+               goto fail0;
+
+       if (!mci_pdev) {
+               const struct pci_device_id *id = &i82443bxgx_pci_tbl[0];
+               int i = 0;
+               82443bxgx_registered = 0;
+
+               while (mci_pdev == NULL && id->vendor != 0) {
+                       mci_pdev = pci_get_device(id->vendor,
+                                       id->device, NULL);
+                       i++;
+                       id = &i82443bxgx_pci_tbl[i];
+               }
+               if (!mci_pdev) {
+                       debugf0("i82443bxgx pci_get_device fail\n");
+                       pci_rc = -ENODEV;
+                       goto fail1;
+               }
+
+               pci_rc = i82443bxgx_init_one(mci_pdev, i82443bxgx_pci_tbl);
+
+               if (pci_rc < 0) {
+                       debugf0("i82443bxgx init fail\n");
+                       pci_rc = -ENODEV;
+                       goto fail1;
+               }
+       }
+
+       return 0;
+
+fail1:
+       pci_unregister_driver(&i82975x_driver);
+
+fail0:
+       if (mci_pdev)
+               pci_dev_put(mci_pdev);
+
+       return pci_rc;
  }

  static void __exit i82443bxgx_edacmc_exit(void)
  {
         pci_unregister_driver(&i82443bxgx_edacmc_driver);
+
+       if (!i82443bxgx_registered)
+               i82443bxgx_remove_one(mci_pdev);
+
+       if (mci_pdev)
+               pci_dev_put(mci_pdev);
  }

  module_init(i82443bxgx_edacmc_init);
--
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