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authorKarlis Ogsts <karlis.ogsts@sonymobile.com>2013-07-22 13:51:42 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-07-23 15:08:50 -0700
commit72bb99cfe9c57d2044445fb34bbc95b4c0bae6f2 (patch)
tree6a16268fd96d01eda5d3a592415f94dbd0505d65 /drivers/staging
parent644d478793c6594277f8ae76954da4ace7ac6f96 (diff)
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@android.com> Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging')
-rw-r--r--drivers/staging/android/logger.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/staging/android/logger.c b/drivers/staging/android/logger.c
index 080abf2faf97..a8c344422a77 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