Messages in this thread Patch in this message | | | From | <> | Subject | [PATCH] printk: Fix unnecessary returning broken pipe error from devkmsg_read | Date | Wed, 18 Sep 2019 21:31:43 +0800 |
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From: He Zhe <zhe.he@windriver.com>
When users read the buffer from start, there is no need to return -EPIPE since the possible overflows will not affect the output.
Signed-off-by: He Zhe <zhe.he@windriver.com> --- kernel/printk/printk.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c index 1888f6a..4a6a129 100644 --- a/kernel/printk/printk.c +++ b/kernel/printk/printk.c @@ -886,7 +886,9 @@ static ssize_t devkmsg_read(struct file *file, char __user *buf, logbuf_lock_irq(); } - if (user->seq < log_first_seq) { + if (user->seq == 0) { + user->seq = log_first_seq; + } else if (user->seq < log_first_seq) { /* our last seen message is gone, return error and reset */ user->idx = log_first_idx; user->seq = log_first_seq; -- 2.7.4
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