This is a note to let you know that I've just added the patch titled
ata: fixes kernel crash while tracing ata_eh_link_autopsy event
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ata-fixes-kernel-crash-while-tracing-ata_eh_link_autopsy-event.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f1601113ddc0339a745e702f4fb1ca37d4875e65 Mon Sep 17 00:00:00 2001
From: Rameshwar Prasad Sahu <rsahu@xxxxxxx>
Date: Thu, 2 Nov 2017 16:31:07 +0530
Subject: ata: fixes kernel crash while tracing ata_eh_link_autopsy event
From: Rameshwar Prasad Sahu <rsahu@xxxxxxx>
commit f1601113ddc0339a745e702f4fb1ca37d4875e65 upstream.
When tracing ata link error event, the kernel crashes when the disk is
removed due to NULL pointer access by trace_ata_eh_link_autopsy API.
This occurs as the dev is NULL when the disk disappeared. This patch
fixes this crash by calling trace_ata_eh_link_autopsy only if "dev"
is not NULL.
v2 changes:
Removed direct passing "link" pointer instead of "dev" in trace API.
Signed-off-by: Rameshwar Prasad Sahu <rsahu@xxxxxxx>
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Fixes: 255c03d15a29 ("libata: Add tracepoints")
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/ata/libata-eh.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -2245,8 +2245,8 @@ static void ata_eh_link_autopsy(struct a
if (dev->flags & ATA_DFLAG_DUBIOUS_XFER)
eflags |= ATA_EFLAG_DUBIOUS_XFER;
ehc->i.action |= ata_eh_speed_down(dev, eflags, all_err_mask);
+ trace_ata_eh_link_autopsy(dev, ehc->i.action, all_err_mask);
}
- trace_ata_eh_link_autopsy(dev, ehc->i.action, all_err_mask);
DPRINTK("EXIT\n");
}
Patches currently in stable-queue which might be from rsahu@xxxxxxx are
queue-4.4/ata-fixes-kernel-crash-while-tracing-ata_eh_link_autopsy-event.patch