This is a note to let you know that I've just added the patch titled
staging: android: logger: Correct write offset reset on error
to my staging git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git
in the staging-linus branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.
If you have any questions about this process, please let me know.
>From 72bb99cfe9c57d2044445fb34bbc95b4c0bae6f2 Mon Sep 17 00:00:00 2001
From: Karlis Ogsts <karlis.ogsts@xxxxxxxxxxxxxx>
Date: Mon, 22 Jul 2013 13:51:42 -0700
Subject: staging: android: logger: Correct write offset reset on error
In the situation that a writer fails to copy data from userspace it will reset
the write offset to the value it had before it went to sleep. This discarding
any messages written while aquiring the mutex.
Therefore the reset offset needs to be retrieved after acquiring the mutex.
Cc: Android Kernel Team <kernel-team@xxxxxxxxxxx>
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/android/logger.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/android/logger.c b/drivers/staging/android/logger.c
index 080abf2f..a8c34442 100644
--- a/drivers/staging/android/logger.c
+++ b/drivers/staging/android/logger.c
@@ -469,7 +469,7 @@ static ssize_t logger_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t ppos)
{
struct logger_log *log = file_get_log(iocb->ki_filp);
- size_t orig = log->w_off;
+ size_t orig;
struct logger_entry header;
struct timespec now;
ssize_t ret = 0;
@@ -490,6 +490,8 @@ static ssize_t logger_aio_write(struct kiocb *iocb, const struct iovec *iov,
mutex_lock(&log->mutex);
+ orig = log->w_off;
+
/*
* Fix up any readers, pulling them forward to the first readable
* entry after (what will be) the new write offset. We do this now
--
1.8.3.rc0.20.gb99dd2e
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