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| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2010-04-20 14:49:01 +0200 |
|---|---|---|
| committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2010-04-21 08:09:17 +0200 |
| commit | 04de0816173c86948b75da93a6344a0a02bbec4d (patch) | |
| tree | ed4b274c1ce5da03a9c37f5858a331529e5b150f /include/pcmcia | |
| parent | 05ce7bfe547c9fa967d9cab6c37867a9cb6fb3fa (diff) | |
| download | lwn-04de0816173c86948b75da93a6344a0a02bbec4d.tar.gz lwn-04de0816173c86948b75da93a6344a0a02bbec4d.zip | |
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/pcmcia')
| -rw-r--r-- | include/pcmcia/ds.h | 7 | ||||
| -rw-r--r-- | include/pcmcia/ss.h | 8 |
2 files changed, 6 insertions, 9 deletions
diff --git a/include/pcmcia/ds.h b/include/pcmcia/ds.h index d57847f2f6c1..aab3c13dc310 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 2e488b60bc76..344705cb42f4 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; |