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pcmcia: pcmcia_dev_present bugfix

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pcmcia_dev_present is in and by itself buggy. Add a note specifying
why it is broken, and replace the broken locking -- taking a mutex
is a bad idea in IRQ context, from which this function is rarely
called -- by an atomic_t.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
This commit is contained in:
Dominik Brodowski
2010-04-20 14:49:01 +02:00
parent 05ce7bfe54
commit 04de081617
3 changed files with 20 additions and 42 deletions
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7
include/pcmcia/ds.h
View File

@@ -26,6 +26,7 @@
#ifdef __KERNEL__
#include <linux/device.h>
#include <pcmcia/ss.h>
#include <asm/atomic.h>
/*
* PCMCIA device drivers (16-bit cards only; 32-bit cards require CardBus
@@ -94,10 +95,8 @@ struct pcmcia_device {
config_req_t conf;
window_handle_t win;
/* Is the device suspended, or in the process of
* being removed? */
/* Is the device suspended? */
u16 suspended:1;
u16 _removed:1;
/* Flags whether io, irq, win configurations were
* requested, and whether the configuration is "locked" */
@@ -115,7 +114,7 @@ struct pcmcia_device {
u16 has_card_id:1;
u16 has_func_id:1;
u16 reserved:3;
u16 reserved:4;
u8 func_id;
u16 manf_id;

8
include/pcmcia/ss.h
View File

@@ -224,18 +224,16 @@ struct pcmcia_socket {
/* 16-bit state: */
struct {
/* PCMCIA card is present in socket */
u8 present:1;
/* "master" ioctl is used */
u8 busy:1;
/* pcmcia module is being unloaded */
u8 dead:1;
/* the PCMCIA card consists of two pseudo devices */
u8 has_pfc:1;
u8 reserved:4;
u8 reserved:6;
} pcmcia_state;
/* non-zero if PCMCIA card is present */
atomic_t present;
#ifdef CONFIG_PCMCIA_IOCTL
struct user_info_t *user;