From: Thomas Hood <jdthood@mail.com>
To: linux-kernel@vger.kernel.org
Subject: [PATCH] PnPBIOS patch #11
Date: 06 Nov 2001 08:53:00 -0500 [thread overview]
Message-ID: <1005054783.20875.37.camel@thanatos> (raw)
This is the same patch as #10 except that pnpbios_get_device()
has been chopped out (because I think Alan doesn't like it).
- Minor formatting changes
- Use spin_lock_init() instead of "= SPIN_LOCK_UNLOCKED"
- Add some comments
- Don't export pnpbios_announce_device, which isn't
used by outsiders
- Don't spinlock when accessing info that doesn't change
- Update Christian Schmidt's e-mail address
Should be safe to apply.
--
Thomas Hood
The Patch:
--- linux-2.4.13-ac7/drivers/pnp/pnp_bios.c Sat Nov 3 18:15:27 2001
+++ linux-2.4.13-ac7-fix/drivers/pnp/pnp_bios.c Tue Nov 6 08:48:10 2001
@@ -1,7 +1,7 @@
/*
* PnP BIOS services
*
- * Originally (C) 1998 Christian Schmidt (chr.schmidt@tu-bs.de)
+ * Originally (C) 1998 Christian Schmidt <schmidt@digadd.de>
* Modifications (c) 1998 Tom Lees <tom@lpsg.demon.co.uk>
* Minor reorganizations by David Hinds <dahinds@users.sourceforge.net>
* Modifications (c) 2001 by Thomas Hood <jdthood@mail.com>
@@ -86,12 +86,12 @@
static union pnp_bios_expansion_header * pnp_bios_hdr = NULL;
/* The PnP BIOS entries in the GDT */
-#define PNP_GDT 0x0060
-#define PNP_CS32 (PNP_GDT+0x00) /* segment for calling fn */
-#define PNP_CS16 (PNP_GDT+0x08) /* code segment for BIOS */
-#define PNP_DS (PNP_GDT+0x10) /* data segment for BIOS */
-#define PNP_TS1 (PNP_GDT+0x18) /* transfer data segment */
-#define PNP_TS2 (PNP_GDT+0x20) /* another data segment */
+#define PNP_GDT (0x0060)
+#define PNP_CS32 (PNP_GDT+0x00) /* segment for calling fn */
+#define PNP_CS16 (PNP_GDT+0x08) /* code segment for BIOS */
+#define PNP_DS (PNP_GDT+0x10) /* data segment for BIOS */
+#define PNP_TS1 (PNP_GDT+0x18) /* transfer data segment */
+#define PNP_TS2 (PNP_GDT+0x20) /* another data segment */
/*
* These are some opcodes for a "static asmlinkage"
@@ -137,7 +137,7 @@
u32 pnp_bios_fault_eip;
u32 pnp_bios_is_utter_crap = 0;
-static spinlock_t pnp_bios_lock = SPIN_LOCK_UNLOCKED;
+static spinlock_t pnp_bios_lock;
static inline u16 call_pnp_bios(u16 func, u16 arg1, u16 arg2, u16 arg3,
u16 arg4, u16 arg5, u16 arg6, u16 arg7)
@@ -230,19 +230,19 @@
*
*/
-#define PNP_GET_NUM_SYS_DEV_NODES 0x00
-#define PNP_GET_SYS_DEV_NODE 0x01
-#define PNP_SET_SYS_DEV_NODE 0x02
-#define PNP_GET_EVENT 0x03
-#define PNP_SEND_MESSAGE 0x04
+#define PNP_GET_NUM_SYS_DEV_NODES 0x00
+#define PNP_GET_SYS_DEV_NODE 0x01
+#define PNP_SET_SYS_DEV_NODE 0x02
+#define PNP_GET_EVENT 0x03
+#define PNP_SEND_MESSAGE 0x04
#define PNP_GET_DOCKING_STATION_INFORMATION 0x05
-#define PNP_SET_STATIC_ALLOCED_RES_INFO 0x09
-#define PNP_GET_STATIC_ALLOCED_RES_INFO 0x0a
-#define PNP_GET_APM_ID_TABLE 0x0b
-#define PNP_GET_PNP_ISA_CONFIG_STRUC 0x40
-#define PNP_GET_ESCD_INFO 0x41
-#define PNP_READ_ESCD 0x42
-#define PNP_WRITE_ESCD 0x43
+#define PNP_SET_STATIC_ALLOCED_RES_INFO 0x09
+#define PNP_GET_STATIC_ALLOCED_RES_INFO 0x0a
+#define PNP_GET_APM_ID_TABLE 0x0b
+#define PNP_GET_PNP_ISA_CONFIG_STRUC 0x40
+#define PNP_GET_ESCD_INFO 0x41
+#define PNP_READ_ESCD 0x42
+#define PNP_WRITE_ESCD 0x43
/*
* Call PnP BIOS with function 0x00, "get number of system device nodes"
@@ -793,26 +793,26 @@
* presumably it continues to describe the current config.
* For those BIOSes that can change the current config, we
* keep the information in the devlist up to date.
+ *
+ * Note that it is currently assumed that the list does not
+ * grow or shrink in size after init time, and slot_name
+ * never changes.
*/
static LIST_HEAD(pnpbios_devices);
-spinlock_t pnpbios_devices_lock = SPIN_LOCK_UNLOCKED;
-EXPORT_SYMBOL(pnpbios_devices_lock);
+static spinlock_t pnpbios_devices_lock;
static int inline pnpbios_insert_device(struct pci_dev *dev)
{
- unsigned long flags;
-
- spin_lock_irqsave(&pnpbios_devices_lock, flags);
/*
* FIXME: Check for re-add of existing node;
* return -1 if node already present
*/
- list_add_tail(&dev->global_list, &pnpbios_devices);
- spin_unlock_irqrestore(&pnpbios_devices_lock, flags);
+ /* We don't lock because we only do this at init time */
+ list_add_tail(&dev->global_list, &pnpbios_devices);
return 0;
}
@@ -898,62 +898,59 @@
nodes_got, nodes_got != 1 ? "s" : "", devs);
}
+/*
+ * Return pointer to device node after *prev with name pnpid[]
+ */
struct pci_dev *pnpbios_find_device(char *pnpid, struct pci_dev *prev)
{
struct pci_dev *dev;
- int nodenum;
- unsigned long flags;
+ int minnodenum;
- nodenum = 0;
+ minnodenum = 0;
if(prev)
- nodenum=prev->devfn + 1;
-
- spin_lock_irqsave(&pnpbios_devices_lock, flags);
+ minnodenum=prev->devfn + 1;
+ /*
+ * We don't lock. We assume that the list can be
+ * traversed and slot_name searched at any time,
+ * since this is static information.
+ */
pnpbios_for_each_dev(dev) {
- if(dev->devfn >= nodenum) {
+ if(dev->devfn >= minnodenum) {
if(memcmp(dev->slot_name, pnpid, 7)==0)
- goto out;
+ return dev;
}
}
- dev = (struct pci_dev *)NULL;
-
-out:
- spin_unlock_irqrestore(&pnpbios_devices_lock, flags);
- return dev;
+ return (struct pci_dev *)NULL;
}
EXPORT_SYMBOL(pnpbios_find_device);
-static struct pci_dev *__pnpbios_find_device_by_nodenum( u8 nodenum )
+static struct pci_dev *pnpbios_find_device_by_nodenum( u8 nodenum )
{
struct pci_dev *dev;
pnpbios_for_each_dev(dev) {
if(dev->devfn == nodenum)
- goto out;
+ return dev;
}
- dev = (struct pci_dev *)NULL;
-out:
- return dev;
+ return NULL;
}
static void pnpbios_update_devlist( u8 nodenum, struct pnp_bios_node *data )
{
struct pci_dev *dev;
- unsigned long flags;
-
- spin_lock_irqsave(&pnpbios_devices_lock, flags);
- dev = __pnpbios_find_device_by_nodenum( nodenum );
+ dev = pnpbios_find_device_by_nodenum( nodenum );
if ( dev ) {
+ unsigned long flags;
+ spin_lock_irqsave(&pnpbios_devices_lock, flags);
pnpbios_node_resource_data_to_dev(data,dev);
+ spin_unlock_irqrestore(&pnpbios_devices_lock, flags);
}
- spin_unlock_irqrestore(&pnpbios_devices_lock, flags);
-
return;
}
@@ -976,11 +973,11 @@
* @dev: the PnPBIOS device structure to match against
*
* Used by a driver to check whether a PnPBIOS device present in the
- * system is in its list of supported devices.Returns the matching
+ * system is in its list of supported devices. Returns the matching
* pnpbios_device_id structure or %NULL if there is no match.
*/
-const struct pnpbios_device_id *
+static const struct pnpbios_device_id *
pnpbios_match_device(const struct pnpbios_device_id *ids, const struct pci_dev *dev)
{
while (*ids->id)
@@ -992,7 +989,7 @@
return NULL;
}
-int pnpbios_announce_device(struct pnpbios_driver *drv, struct pci_dev *dev)
+static int pnpbios_announce_device(struct pnpbios_driver *drv, struct pci_dev *dev)
{
const struct pnpbios_device_id *id;
int ret = 0;
@@ -1017,8 +1014,6 @@
return ret;
}
-EXPORT_SYMBOL(pnpbios_announce_device);
-
/**
* pnpbios_register_driver - register a new pci driver
* @drv: the driver structure to register
@@ -1206,6 +1201,7 @@
int i, length;
spin_lock_init(&pnp_bios_lock);
+ spin_lock_init(&pnpbios_devices_lock);
if(pnpbios_disabled) {
printk(KERN_INFO "PnPBIOS: Disabled.\n");
--- linux-2.4.13-ac7/include/linux/pnp_bios.h Sat Nov 3 18:29:25 2001
+++ linux-2.4.13-ac7-fix/include/linux/pnp_bios.h Tue Nov 6 08:40:53 2001
@@ -137,8 +137,7 @@
for(dev = pnpbios_dev_g(pnpbios_devices.next); dev != pnpbios_dev_g(&pnpbios_devices); dev = pnpbios_dev_g(dev->global_list.next))
/* exported functions */
-extern struct pci_dev *pnpbios_find_device(char *pnpid, struct pci_dev *dev);
-extern int pnpbios_announce_device(struct pnpbios_driver *drv, struct pci_dev *dev);
+extern struct pci_dev *pnpbios_find_device(char *pnpid, struct pci_dev *prevdev);
extern int pnpbios_register_driver(struct pnpbios_driver *drv);
extern void pnpbios_unregister_driver(struct pnpbios_driver *drv);
@@ -202,11 +201,6 @@
static __inline__ struct pci_dev *pnpbios_find_device(char *pnpid, struct pci_dev *dev)
{
return NULL;
-}
-
-static __inline__ int pnpbios_announce_device(struct pnpbios_driver *drv, struct pci_dev *dev)
-{
- return 0;
}
static __inline__ int pnpbios_register_driver(struct pnpbios_driver *drv)
next reply other threads:[~2001-11-06 13:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-06 13:53 Thomas Hood [this message]
2001-11-06 14:10 ` [PATCH] PnPBIOS patch #11 Alan Cox
-- strict thread matches above, loose matches on Subject: below --
2001-11-06 14:39 Thomas Hood
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