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-rw-r--r--drivers/infiniband/hw/ipath/ipath_iba6120.c13
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/infiniband/hw/ipath/ipath_iba6120.c b/drivers/infiniband/hw/ipath/ipath_iba6120.c
index a324c6f7aeba..d43f0b3a43fe 100644
--- a/drivers/infiniband/hw/ipath/ipath_iba6120.c
+++ b/drivers/infiniband/hw/ipath/ipath_iba6120.c
@@ -1143,11 +1143,14 @@ static void ipath_pe_put_tid(struct ipath_devdata *dd, u64 __iomem *tidptr,
1143 pa |= 2 << 29; 1143 pa |= 2 << 29;
1144 } 1144 }
1145 1145
1146 /* workaround chip bug 9437 by writing each TID twice 1146 /*
1147 * and holding a spinlock around the writes, so they don't 1147 * Workaround chip bug 9437 by writing the scratch register
1148 * intermix with other TID (eager or expected) writes 1148 * before and after the TID, and with an io write barrier.
1149 * Unfortunately, this call can be done from interrupt level 1149 * We use a spinlock around the writes, so they can't intermix
1150 * for the port 0 eager TIDs, so we have to use irqsave 1150 * with other TID (eager or expected) writes (the chip bug
1151 * is triggered by back to back TID writes). Unfortunately, this
1152 * call can be done from interrupt level for the port 0 eager TIDs,
1153 * so we have to use irqsave locks.
1151 */ 1154 */
1152 spin_lock_irqsave(&dd->ipath_tid_lock, flags); 1155 spin_lock_irqsave(&dd->ipath_tid_lock, flags);
1153 ipath_write_kreg(dd, dd->ipath_kregs->kr_scratch, 0xfeeddeaf); 1156 ipath_write_kreg(dd, dd->ipath_kregs->kr_scratch, 0xfeeddeaf);