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authorDominik Brodowski <linux@dominikbrodowski.net>2010-04-20 14:49:01 +0200
committerDominik Brodowski <linux@dominikbrodowski.net>2010-04-21 08:09:17 +0200
commit04de0816173c86948b75da93a6344a0a02bbec4d (patch)
treeed4b274c1ce5da03a9c37f5858a331529e5b150f /include
parent05ce7bfe547c9fa967d9cab6c37867a9cb6fb3fa (diff)
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pcmcia: pcmcia_dev_present bugfix
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>
Diffstat (limited to 'include')
-rw-r--r--include/pcmcia/ds.h7
-rw-r--r--include/pcmcia/ss.h8
2 files changed, 6 insertions, 9 deletions
diff --git a/include/pcmcia/ds.h b/include/pcmcia/ds.h
index d57847f2f6c..aab3c13dc31 100644
--- a/include/pcmcia/ds.h
+++ b/include/pcmcia/ds.h
@@ -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;
diff --git a/include/pcmcia/ss.h b/include/pcmcia/ss.h
index 2e488b60bc7..344705cb42f 100644
--- a/include/pcmcia/ss.h
+++ b/include/pcmcia/ss.h
@@ -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;