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authorChristian Lamparter <chunkeey@googlemail.com>2016-04-26 12:03:03 +0300
committerTejun Heo <tj@kernel.org>2016-05-10 12:29:18 -0400
commita7e6de544c5c238a06935c96d27151432c94d2e6 (patch)
tree3ad2fd28b7095c63a62b6ee69219188bc152b2b3 /drivers/ata
parent55e610cdd28c0ad3dce0652030c0296d549673f3 (diff)
downloadlinux-a7e6de544c5c238a06935c96d27151432c94d2e6.tar.bz2
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.c7
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,
};