linux-kernel - Re: my first janitorial

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Message-ID: <20070401170043.27a581cb@the-village.bc.nu>
Date:	Sun, 1 Apr 2007 17:00:43 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Pedram M" <pmessri@...il.com>
Cc:	kernel-janitors@...ts.osdl.org, linux-kernel@...r.kernel.org
Subject: Re: my first janitorial

On Sat, 31 Mar 2007 22:24:12 -0700
"Pedram M" <pmessri@...il.com> wrote:

> How about this one? Am I doing it right now?
> If not, please try to explain more to me what I am
> doing wrong.

You need to hold a reference to the PCI device for the entire duration it
is used. I think you actually also need something like this to get the whole
thing using pci references and pci_get_* properly

Alan

--- drivers/char/cyclades.c~	2007-04-01 15:52:16.000000000 +0100
+++ drivers/char/cyclades.c	2007-04-01 15:52:16.000000000 +0100
@@ -4803,7 +4782,7 @@
                 cy_card[j].bus_index = 1;
                 cy_card[j].first_line = cy_next_channel;
                 cy_card[j].num_chips = cy_pci_nchan/4;
-		cy_card[j].pdev = pdev;
+		cy_card[j].pdev = pci_dev_get(pdev);
 	
                 /* enable interrupts in the PCI interface */
 		plx_ver = cy_readb(cy_pci_addr2 + CyPLX_VER) & 0x0f;
@@ -4901,7 +4880,7 @@
 			Ze_addr0[ZeIndex] = cy_pci_addr0;
 			Ze_addr2[ZeIndex] = cy_pci_addr2;
 			Ze_irq[ZeIndex] = cy_pci_irq;
-			Ze_pdev[ZeIndex] = pdev;
+			Ze_pdev[ZeIndex] = pci_dev_get(pdev);
 			ZeIndex++;
 		    }
 		    i--;
@@ -4986,7 +4965,7 @@
                 cy_card[j].bus_index = 1;
                 cy_card[j].first_line = cy_next_channel;
                 cy_card[j].num_chips = -1;
-		cy_card[j].pdev = pdev;
+		cy_card[j].pdev = pci_dev_get(pdev);
 
                 /* print message */
 #ifdef CONFIG_CYZ_INTR
@@ -5007,6 +4986,10 @@
                 cy_next_channel += cy_pci_nchan;
 	    }
         }
+        
+        if (pdev)
+		pci_dev_put(pdev);
+        
 
         for (; ZeIndex != 0 && i < NR_CARDS; i++) {
 	    cy_pci_phys0 = Ze_phys0[0];
@@ -5485,11 +5468,12 @@
 	    )
 		free_irq(cy_card[i].irq, &cy_card[i]);
 #ifdef CONFIG_PCI
-		if (cy_card[i].pdev)
+		if (cy_card[i].pdev) {
 			pci_release_regions(cy_card[i].pdev);
+			pci_dev_put(pdev);
+		}
 #endif
         }
     }
 } /* cy_cleanup_module */
 
 module_init(cy_init);
-
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