diff options
author | Rameshwar Prasad Sahu <rsahu@apm.com> | 2017-11-02 16:31:07 +0530 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-11-30 08:40:47 +0000 |
commit | 496e65f64903a3ad420a07466c5d008432136985 (patch) | |
tree | 2b43abe0ba8832e0c6e95efbd41e4b8273cdf192 /drivers/ata/libata-eh.c | |
parent | 2f5be981622190fa85ba3eed31e974d73a2cae71 (diff) |
ata: fixes kernel crash while tracing ata_eh_link_autopsy event
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@apm.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Fixes: 255c03d15a29 ("libata: Add tracepoints")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/ata/libata-eh.c')
-rw-r--r-- | drivers/ata/libata-eh.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c index e4effef0c83f..ea20e0eb4d5a 100644 --- a/drivers/ata/libata-eh.c +++ b/drivers/ata/libata-eh.c @@ -2264,8 +2264,8 @@ static void ata_eh_link_autopsy(struct ata_link *link) 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"); } |