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[v7,01/17] pci: fix unaligned access in pci_xxx_quad()

Message ID 1464679259-1378-2-git-send-email-dmitry@daynix.com (mailing list archive)
State New, archived
Headers show

Commit Message

Dmitry Fleytman May 31, 2016, 7:20 a.m. UTC 
From: Dmitry Fleytman <dmitry.fleytman@ravellosystems.com>

Replace legacy cpu_to_le64w()/le64_to_cpup()
calls with stq_le_p()/ldq_le_p().

Motivation for this modification is that
follow up patches add utility function
pcie_dev_ser_num_init() for PCIe DSN
capability creation which uses
pci_set_quad() with a misaligned offset.

Signed-off-by: Dmitry Fleytman <dmitry.fleytman@ravellosystems.com>
Signed-off-by: Leonid Bloch <leonid.bloch@ravellosystems.com>
---
 include/hw/pci/pci.h | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)
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Patch

diff --git a/include/hw/pci/pci.h b/include/hw/pci/pci.h
index ef6ba51..4420f47 100644
--- a/include/hw/pci/pci.h
+++ b/include/hw/pci/pci.h
@@ -465,16 +465,23 @@  pci_get_long(const uint8_t *config)
     return ldl_le_p(config);
 }
 
+/*
+ * PCI capabilities and/or their fields
+ * are generally DWORD aligned only so
+ * mechanism used by pci_set/get_quad()
+ * must be tolerant to unaligned pointers
+ *
+ */
 static inline void
 pci_set_quad(uint8_t *config, uint64_t val)
 {
-    cpu_to_le64w((uint64_t *)config, val);
+    stq_le_p(config, val);
 }
 
 static inline uint64_t
 pci_get_quad(const uint8_t *config)
 {
-    return le64_to_cpup((const uint64_t *)config);
+    return ldq_le_p(config);
 }
 
 static inline void