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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>
This commit is contained in:
Christian Lamparter 2016-04-26 12:03:03 +03:00 committed by Tejun Heo
parent 55e610cdd2
commit a7e6de544c
1 changed files with 7 additions and 0 deletions
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7
drivers/ata/sata_dwc_460ex.c
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@ -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,
};