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| author | Christian Lamparter <chunkeey@googlemail.com> | 2016-04-26 12:03:03 +0300 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2016-05-10 12:29:18 -0400 |
| commit | a7e6de544c5c238a06935c96d27151432c94d2e6 (patch) | |
| tree | 3ad2fd28b7095c63a62b6ee69219188bc152b2b3 /drivers/ata | |
| parent | 55e610cdd28c0ad3dce0652030c0296d549673f3 (diff) | |
| download | linux-a7e6de544c5c238a06935c96d27151432c94d2e6.tar.gz linux-a7e6de544c5c238a06935c96d27151432c94d2e6.tar.bz2 linux-a7e6de544c5c238a06935c96d27151432c94d2e6.zip | |
ata: sata_dwc_460ex: fix crash on offline links without an attached drive
This patch fixes Machine Check "Data Write PLB Error" which happens
when libata-sff's ata_sff_dev_select is trying to write into the
device_addr in order to select a drive. However, SATA has no master
or slave devices like the old ATA Bus, therefore selecting a
different drive is kind of pointless.
Data Write PLB Error
Oops: Machine check, sig: 7 [#1]
PowerPC 44x Platform
Modules linked in:
CPU: 0 PID: 508 Comm: scsi_eh_0 Not tainted 4.6.0-rc3-next-20160412+ #10
[...]
NIP [c027e820] ata_sff_dev_select+0x3c/0x44
LR [c027e810] ata_sff_dev_select+0x2c/0x44
Call Trace:
[cec31cd0] [c027da00] ata_sff_postreset+0x40/0xb4 (unreliable)
[cec31ce0] [c027a03c] ata_eh_reset+0x5cc/0x928
[cec31d60] [c027a840] ata_eh_recover+0x330/0x10bc
[cec31df0] [c027bae0] ata_do_eh+0x4c/0xa4
[...]
Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/sata_dwc_460ex.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/ata/sata_dwc_460ex.c b/drivers/ata/sata_dwc_460ex.c index 5213e2205606..7f953892647a 100644 --- a/drivers/ata/sata_dwc_460ex.c +++ b/drivers/ata/sata_dwc_460ex.c @@ -1134,6 +1134,11 @@ static int sata_dwc_hardreset(struct ata_link *link, unsigned int *class, return ret; } +static void sata_dwc_dev_select(struct ata_port *ap, unsigned int device) +{ + /* SATA DWC is master only */ +} + /* * scsi mid-layer and libata interface structures */ @@ -1164,6 +1169,8 @@ static struct ata_port_operations sata_dwc_ops = { .port_start = sata_dwc_port_start, .port_stop = sata_dwc_port_stop, + .sff_dev_select = sata_dwc_dev_select, + .bmdma_setup = sata_dwc_bmdma_setup, .bmdma_start = sata_dwc_bmdma_start, }; |