diff options
| author | Paul Fox <pgf@laptop.org> | 2010-10-01 18:17:19 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-11-22 10:47:32 -0800 |
| commit | f86bbe3d27d8ca02e40fbd779238a7c89924f0ca (patch) | |
| tree | 09e896de722ec908cfff56d1442ff8535bc65528 /arch | |
| parent | ae832c21a08514fd11d2d1d6e217c8a537764bb0 (diff) | |
x86, olpc: Don't retry EC commands forever
commit 286e5b97eb22baab9d9a41ca76c6b933a484252c upstream.
Avoids a potential infinite loop.
It was observed once, during an EC hacking/debugging
session - not in regular operation.
Signed-off-by: Daniel Drake <dsd@laptop.org>
Cc: dilinger@queued.net
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/olpc.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/x86/kernel/olpc.c b/arch/x86/kernel/olpc.c index 4006c522adc7..38faf7211d0b 100644 --- a/arch/x86/kernel/olpc.c +++ b/arch/x86/kernel/olpc.c @@ -115,6 +115,7 @@ int olpc_ec_cmd(unsigned char cmd, unsigned char *inbuf, size_t inlen, unsigned long flags; int ret = -EIO; int i; + int restarts = 0; spin_lock_irqsave(&ec_lock, flags); @@ -171,7 +172,9 @@ restart: if (wait_on_obf(0x6c, 1)) { printk(KERN_ERR "olpc-ec: timeout waiting for" " EC to provide data!\n"); - goto restart; + if (restarts++ < 10) + goto restart; + goto err; } outbuf[i] = inb(0x68); printk(KERN_DEBUG "olpc-ec: received 0x%x\n", |