linux-kernel - [PATCH 4.14 161/228] parisc: mask out enable and reserved bits from sba imask

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Date:   Thu, 20 Aug 2020 11:22:16 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sven Schnelle <svens@...ckframe.org>,
        Helge Deller <deller@....de>
Subject: [PATCH 4.14 161/228] parisc: mask out enable and reserved bits from sba imask

From: Sven Schnelle <svens@...ckframe.org>

commit 5b24993c21cbf2de11aff077a48c5cb0505a0450 upstream.

When using kexec the SBA IOMMU IBASE might still have the RE
bit set. This triggers a WARN_ON when trying to write back the
IBASE register later, and it also makes some mask calculations fail.

Cc: <stable@...r.kernel.org>
Signed-off-by: Sven Schnelle <svens@...ckframe.org>
Signed-off-by: Helge Deller <deller@....de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/parisc/sba_iommu.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/parisc/sba_iommu.c
+++ b/drivers/parisc/sba_iommu.c
@@ -1291,7 +1291,7 @@ sba_ioc_init_pluto(struct parisc_device
 	** (one that doesn't overlap memory or LMMIO space) in the
 	** IBASE and IMASK registers.
 	*/
-	ioc->ibase = READ_REG(ioc->ioc_hpa + IOC_IBASE);
+	ioc->ibase = READ_REG(ioc->ioc_hpa + IOC_IBASE) & ~0x1fffffULL;
 	iova_space_size = ~(READ_REG(ioc->ioc_hpa + IOC_IMASK) & 0xFFFFFFFFUL) + 1;
 
 	if ((ioc->ibase < 0xfed00000UL) && ((ioc->ibase + iova_space_size) > 0xfee00000UL)) {