diff options
| author | Paul Fox <pgf@laptop.org> | 2010-10-01 18:17:19 +0100 |
|---|---|---|
| committer | Paul Gortmaker <paul.gortmaker@windriver.com> | 2011-01-06 18:08:20 -0500 |
| commit | d5632e193d11e1271a2c342cf8ced60053f83390 (patch) | |
| tree | a5c22a43ebafaeb3589803a93a9ed0d6bae3fe58 | |
| parent | 7d7eb1b7722acbd8277e929fe1c837b1e467dbf6 (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: Paul Gortmaker <paul.gortmaker@windriver.com>
| -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 8297160c41b..a23b38252b8 100644 --- a/arch/x86/kernel/olpc.c +++ b/arch/x86/kernel/olpc.c @@ -117,6 +117,7 @@ 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); @@ -173,7 +174,9 @@ 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", |