---

yaml --- r: 67151 b: refs/heads/master c: 9ef8617 h: refs/heads/master i: 67149: 14e30ef 67147: 3532d2e 67143: 620c135 67135: e536e70 v: v3
git-mirror · Oct 10, 2007 · 05f4f17 · 05f4f17
1 parent 8466c0e
commit 05f4f17
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Showing 2 changed files with 9 additions and 6 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 1793b4771d258c93ed86a6356c95cac418781fdd
+refs/heads/master: 9ef8617af77136e743e5dd4b081a61797888a977
diff --git a/trunk/drivers/infiniband/hw/ipath/ipath_iba6120.c b/trunk/drivers/infiniband/hw/ipath/ipath_iba6120.c
@@ -1143,11 +1143,14 @@ static void ipath_pe_put_tid(struct ipath_devdata *dd, u64 __iomem *tidptr,
 			pa |= 2 << 29;
 	}
 
-	/* workaround chip bug 9437 by writing each TID twice
-	 * and holding a spinlock around the writes, so they don't
-	 * intermix with other TID (eager or expected) writes
-	 * Unfortunately, this call can be done from interrupt level
-	 * for the port 0 eager TIDs, so we have to use irqsave
+	/*
+	 * Workaround chip bug 9437 by writing the scratch register
+	 * before and after the TID, and with an io write barrier.
+	 * We use a spinlock around the writes, so they can't intermix
+	 * with other TID (eager or expected) writes (the chip bug
+	 * is triggered by back to back TID writes). Unfortunately, this
+	 * call can be done from interrupt level for the port 0 eager TIDs,
+	 * so we have to use irqsave locks.
 	 */
 	spin_lock_irqsave(&dd->ipath_tid_lock, flags);
 	ipath_write_kreg(dd, dd->ipath_kregs->kr_scratch, 0xfeeddeaf);