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>
diff --git a/include/pcmcia/ss.h b/include/pcmcia/ss.h
index 2e488b6..344705c 100644
--- a/include/pcmcia/ss.h
+++ b/include/pcmcia/ss.h
@@ -224,18 +224,16 @@
/* 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;