[PATCH 1/1 try #2] Char: correct pci_get_device changes

Jiri Slaby
2006-10-19T14:45:54Z

correct pci_get_device changes

Commits 881a8c120acf7ec09c90289e2996b7c70f51e996 and
efe1ec27837d6639eae82e1f5876910ba6433c3f corrects pci device matching in
only one way; it no longer oopses/crashes, despite hotplug is not solved in
these changes.

Whenever pci_find_device -> pci_get_device change is performed, also
pci_dev_get and pci_dev_put should be in most cases called to properly
handle hotplug. This patch does exactly this thing -- increase refcount to
let kernel know, that we are using this piece of HW just now.

It affects moxa and rio char drivers.

Cc: <R.E.Wolff@BitWizard.nl>
Cc: Amit Gud <gud@eth.net>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>

---
commit 93751c264e1f78e5363f4736e07e2d26ea041809
tree f11b9fa9eeaa3e639d5142c67d5d804724238adb
parent 9e02a6d0d574e8ad39c1fe3a64b8493ec0524b08
author Jiri Slaby <xslaby@anemoi.localdomain> Thu, 19 Oct 2006 16:40:40 +0200
committer Jiri Slaby <xslaby@anemoi.localdomain> Thu, 19 Oct 2006 16:40:40 +0200

drivers/char/moxa.c | 9 +++++++++
drivers/char/rio/host.h | 1 +
drivers/char/rio/rio_linux.c | 9 +++++++++
3 files changed, 19 insertions(+), 0 deletions(-)

diff --git a/drivers/char/moxa.c b/drivers/char/moxa.c
index b401383..ce7376b 100644
--- a/drivers/char/moxa.c
+++ b/drivers/char/moxa.c
@@ -130,6 +130,7 @@ static moxa_isa_board_conf moxa_isa_boar
typedef struct _moxa_pci_devinfo {
ushort busNum;
ushort devNum;
+ struct pci_dev *pdev;
} moxa_pci_devinfo;

typedef struct _moxa_board_conf {
@@ -324,6 +325,9 @@ static int moxa_get_PCI_conf(struct pci_
board->busType = MOXA_BUS_TYPE_PCI;
board->pciInfo.busNum = p->bus->number;
board->pciInfo.devNum = p->devfn >> 3;
+ board->pciInfo.pdev = p;
+ /* don't loss the reference in the next pci_get_device iteration */
+ pci_dev_get(p);

return (0);
}
@@ -493,6 +497,11 @@ static void __exit moxa_exit(void)
if (tty_unregister_driver(moxaDriver))
printk("Couldn't unregister MOXA Intellio family serial driver\n");
put_tty_driver(moxaDriver);
+
+ for (i = 0; i < MAX_BOARDS; i++)
+ if (moxa_boards[i].busType == MOXA_BUS_TYPE_PCI)
+ pci_dev_put(moxa_boards[i].pciInfo.pdev);
+
if (verbose)
printk("Done\n");
}
diff --git a/drivers/char/rio/host.h b/drivers/char/rio/host.h
index ee2ddea..23d0681 100644
--- a/drivers/char/rio/host.h
+++ b/drivers/char/rio/host.h
@@ -44,6 +44,7 @@ #define MAX_EXTRA_UNITS 64
** the host.
*/
struct Host {
+ struct pci_dev *pdev;
unsigned char Type; /* RIO_EISA, RIO_MCA, ... */
unsigned char Ivec; /* POLLED or ivec number */
unsigned char Mode; /* Control stuff */
diff --git a/drivers/char/rio/rio_linux.c b/drivers/char/rio/rio_linux.c
index c382df0..7ac68cb 100644
--- a/drivers/char/rio/rio_linux.c
+++ b/drivers/char/rio/rio_linux.c
@@ -1017,6 +1017,10 @@ #ifdef CONFIG_PCI
rio_dprintk(RIO_DEBUG_PROBE, "Hmm Tested ok, uniqid = %x.\n", p->RIOHosts[p->RIONumHosts].UniqueNum);

fix_rio_pci(pdev);
+
+ p->RIOHosts[p->RIONumHosts].pdev = pdev;
+ pci_dev_get(pdev);
+
p->RIOLastPCISearch = 0;
p->RIONumHosts++;
found++;
@@ -1066,6 +1070,9 @@ #ifdef CONFIG_RIO_OLDPCI
((readb(&p->RIOHosts[p->RIONumHosts].Unique[1]) & 0xFF) << 8) | ((readb(&p->RIOHosts[p->RIONumHosts].Unique[2]) & 0xFF) << 16) | ((readb(&p->RIOHosts[p->RIONumHosts].Unique[3]) & 0xFF) << 24);
rio_dprintk(RIO_DEBUG_PROBE, "Hmm Tested ok, uniqid = %x.\n", p->RIOHosts[p->RIONumHosts].UniqueNum);

+ p->RIOHosts[p->RIONumHosts].pdev = pdev;
+ pci_dev_get(pdev);
+
p->RIOLastPCISearch = 0;
p->RIONumHosts++;
found++;
@@ -1181,6 +1188,8 @@ static void __exit rio_exit(void)
}
/* It is safe/allowed to del_timer a non-active timer */
del_timer(&hp->timer);
+ if (hp->Type == RIO_PCI)
+ pci_dev_put(hp->pdev);
}

if (misc_deregister(&rio_fw_device) < 0) {